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RC224ATL/224ATLV
EmbeddedModem Family
The new Conexant RC224ATL utilizes a new integrated data pump/controller to allow the device to directly connect to host processors that are 3.3 V I/O capable. The codec used in the new part is the same as the codec used in the existing RC224ATL. The new device is form, fit, and function compatible with the existing device. This means there are no hardware and software differences between the existing and the new part, with one exception. The 3.3 V I/O capable part incorporates 3.3 V compatible digital I/O buffers, hence requiring 3.3 V digital supply instead of 5 V digital supply. In addition, unlike the current version of RC224ATL, the new part provides both data and fax capabilities. Data modes, controlled by an industry standard 2400 AT command set, can transmit and receive up to 2400 bps. Fax modes, controlled by a built-in EIA-578 Class 1 command interface, provide Group 3 transmit and receive functions.
Distinguishing Features
* Data modes - CCITT V.22 bis (2400 bps), V.22 (1200 bps) - Bell 212A (1200 bps) and 103 (300 bps) - Enhanced AT commands Group 3 fax modes - V.29 (9600/7200 bps) transmit - V.27 ter (4800/2400 bps) transmit and receive - V.21 Channel 2 (300 bps) transmit and receive EIA-578 Service Class 1 commands V.42/MNP2-4 and V.42 bis/MNP 5 can be supported through host software without additional hardware Data/fax discriminator and auto answering Communications software compatible Integrated call progress and dialing No external microcomputer or memory required Parallel or serial asynchronous DTE interface A/A1 relay control NVRAM interface allows storage of two user configurations and four 36-digit dial strings Automatic adaptive/fixed compromise equalization Programmable sleep mode and wake-up Full-duplex data mode test capabilities: Analog loop, local digital loop, and remote digital loop Half-duplex fax mode test capabilities Automatic format/speed sensing Low power consumption (typical) - Operating: 100 mW - Sleep--Idle: 25 mW - Sleep--Stop: 5 mW Single +5 V power supply or Dual + 3.3 VDD and + 5 VAA power supplies Package options: - 68-pin plastic leaded chip carrier (PLCC) - 100-pin plastic quad flat pack (PQFP)
*
* *
*
Functional Block Diagram
* * * *
Modem Data Pump Telephone Line Interface
* *
*
Modem LED Indictors V.24 EIA-232-D Interface Modem Controller
* *
Optional NVRAM
Optional Speaker
* * *
*
Crystal
*
Data Sheet
D224ATLVDSC March 25, 1999
Ordering Information
Marketing Number RC224ATL RC224ATL RC224ATL RC224ATL RC224ATLV RC224ATLV Manufacturing Number R6781-11 R6781-12 R6781-13 R6781-14 R6781-21 R6781-22 DSP Die Number L2501 L2501 L2503 L2503 L2531 L2531
I/O & VCC 5V 5V 5V 5V 3V 3V
VAA/Codec 5V 5V 5V 5V 5V 5V
Package 68 PLCC 100 PQFP 68 PLCC 100 PQFP 68 PLCC 100 PQFP
Replacement Matrix
Marketing Number RC224ATL Manufacturing Number R6781-11 Package 68 PLCC Replaces RC224ATL/V (R6641-14), RC224ATL (R6641-15), RC224ATL/VN (R6641-16), RC224ATLN (R6641-17), RC224ATL/VE (R6641-24), RC224ATLE (R6641-25) RC224ATL/V (R6641-18), RC224ATL (R6641-19), RC224ATL/VN (R6641-20), RC224ATLN (R6641-21), RC224ATL/VE (R6641-26), RC224ATLE (R6641-27) RC224ATL/VN (R6641-36), RC224ATL/V (R6641-37), RC224ATLN (R6641-38), RC224ATL (R6641-39) RC224ATL/VN (R6641-40), RC224ATATL/V (R6641-41), RC224ATL (R6641-43) N/A: New 3.3 V Digital I/O N/A: New 3.3 V Digital I/O
RC224ATL
R6781-12
100 PQFP
RC224ATL
R6781-13
68 PLCC
RC224ATL RC224ATLV RC224ATLV
R6781-14 R6781-21 R6781-22
100 PQFP 68 PLCC 100 PQFP
Information provided by Conexant Systems, Inc. (Conexant) is believed to be accurate and reliable. However, no responsibility is assumed by Conexant for its use, nor any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of Conexant other than for circuitry embodied in Conexant products. Conexant reserves the right to change circuitry at any time without notice. This document is subject to change without notice. Conexant and "What's Next in Communications Technologies" are trademarks of Conexant Systems, Inc. Product names or services listed in this publication are for identification purposes only, and may be trademarks or registered trademarks of their respective companies. All other marks mentioned herein are the property of their respective holders. (c) 1999 Conexant Systems, Inc. Printed in U.S.A. All Rights Reserved
Reader Response: To improve the quality of our publications, we welcome your feedback. Please send comments or suggestions via e-mail to Conexant Reader Response@conexant.com. Sorry, we can't answer your technical questions at this address. Please contact your local Conexant sales office or local field applications engineer if you have technical questions.
D224ATLVDSC
Conexant
Table of Contents
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix 1.0 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.1 1.2 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2.1 1.2.2 1.2.3 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 Configurations and Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.3.1 Data Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.3.2 Fax Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Data/Fax Auto Answering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Data Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Equalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Scrambler/Descrambler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Transmit Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Transmit Tones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Receive Level. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Receiver Tracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Low Power Sleep Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
1.2.4 1.2.5 1.2.6 1.2.7 1.2.8 1.2.9 1.2.10 1.2.11 1.2.12
2.0
Hardware Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1 Hardware Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 2.1.1 2.1.2 2.1.3 2.1.4 2.2 Parallel Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 Serial/Indicator Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 Speaker Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 Line Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Additional Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
D224ATLVDSC
Conexant
iii
Table of Contents
RC224ATL/224ATLV
EmbeddedModem Family
3.0 4.0 5.0 6.0
Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 AT Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 S Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
6.1 Data Modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6.1.1 6.1.2 6.1.3 6.1.4 6.1.5 6.2 6.2.1 6.2.2 6.2.3 6.2.4 6.2.5 6.2.6 6.2.7 6.2.8 6.2.9 6.3 6.3.1 6.3.2 6.3.3 6.4 6.5 Data Mode Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 Data Modem Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 Call Origination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2 Call Answering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2 Call Termination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2 Fax Mode Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 Fax Mode Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 Fax Origination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 Fax Answering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 Fax Data Transmission. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4 Fax Data Reception . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4 Fax Control Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4 Fax Control Reception . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5 Fax I/O Processing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5 Parallel/Serial Interface Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7 Fax V.42 Buffer Sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7 DTE Flow Control Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8
Fax Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3
Fax Enhanced Flow Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7
Data/Fax Auto Answering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8 Call Progress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12 6.5.1 6.5.2 Call Progress Algorithms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12 Ring Detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13
7.0
Electrical/Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
7.1 7.2 7.3 Interfacing the RC224ATLV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 Environmental Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 Interface Timing and Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2
Appendix A: RC224ATF Modem Designs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
A.1 A.2 68-Pin PLCC Design for Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1 68-Pin PLCC Design for Parallel Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-6
Appendix B: Acronyms/Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
iv Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
List of Figures
List of Figures
Figure 2-1. Figure 2-2. Figure 3-1. Figure 3-2. Figure 3-3. Figure 3-4. Figure 3-5. Figure 7-1. Figure 7-2. Figure 7-3. Figure A-1. Figure A-2. Figure A-3. Figure A-4. RC224ATLV Signals--Parallel Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 RC224ATLV Signals--Serial Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 68-Pin PLCC Package--Serial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 68-Pin PLCC Package--Parallel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 100-Pin PQFP Package--Serial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3 100-Pin PQFP Package--Parallel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4 NVRAM Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20 Timing Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3 68-Pin PLCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7 100-Pin PQFP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9 Serial Interface Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2 Serial Interface Design DAA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3 Parallel Interface Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-7 Parallel Interface Design DAA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-8
D224ATLVDSC
Conexant
v
List of Figures
RC224ATL/224ATLV
EmbeddedModem Family
vi
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
List of Tables
List of Tables
Table 1-1. Table 1-2. Table 1-3. Table 1-4. Table 2-1. Table 2-2. Table 3-1. Table 3-2. Table 3-3. Table 3-4. Table 3-5. Table 4-1. Table 4-2. Table 4-3. Table 5-1. Table 5-2. Table 6-1. Table 6-2. Table 6-3. Table 6-4. Table 6-5. Table 6-6. Table 7-1. Table 7-2. Table 7-3. Table 7-4. Table 7-5. Table 7-6. Table 7-7. Table 7-8. Table A-1. Table A-2. Configurations and Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Data Rates vs. Connection Modem Rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1- 3 Dial Digits/Tone Pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Current and Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 Parallel Interface Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Programmable Baud Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 RC224ATL/224ATLV 68-Pin PLCC Pin Assignments--Serial Mode . . . . . . . . . . . . . . . . . . . 3-5 RC224ATLV 68-Pin PLCC Pin Assignments--Parallel Mode. . . . . . . . . . . . . . . . . . . . . . . . . 3-6 RC224ATL/224ATLV 100-Pin PQFP Pin Assignments--Serial . . . . . . . . . . . . . . . . . . . . . . . 3-7 RC224ATL/224ATLV 100-Pin PQFP Pin Assignments--Parallel . . . . . . . . . . . . . . . . . . . . . 3-11 Hardware Interface Signal Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15 Result Codes and Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 AT Command Set Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 Fax Command Set Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7 S Register Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 S Register Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3 Data Rate Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 Terminal Called by a 1200 bps Data Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10 Terminal Called by a Fax Machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11 Tone Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12 Fax Class 1 Calling Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13 Fax Class 1 Answering Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15 Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 Timing-Host Bus Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2 Current and Power Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4 Digital Interface Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5 Analog Interface Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6 68-Pin PLCC Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8 100-Pin PQFP Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10 Serial Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-4 Parallel Billing Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9
D224ATLVDSC
Conexant
vii
List of Tables
RC224ATL/224ATLV
EmbeddedModem Family
viii
Conexant
D224ATLVDSC
1
1.0 Functional Description
1.1 Overview
The Conexant RC224ATLV is a combination V bis data and Group 3 fax .22 CMOS modem in a single VLSI package and is identical to the RC224ATLV The . RC224ATLV integrated data/fax modem is available in either a 68-pin plastic leaded chip carrier (PLCC) or a 100-pin plastic quad flat pack (PQFP). Full error correction (V LAPM, MNP2-4) and data compression (V bis, .42 .42 MNP 5) capabilities can be supported in the RC224ATLV using the host communication software. The modem has a selectable parallel or serial interface to the host data terminal equipment (DTE). When parallel mode is selected, a 16C450-compatible interface allows direct connection to a notebook, laptop, or PC-compatible bus without an external universal asynchronous receive/transmit (UART). When serial mode is selected, a CCITT V logic-compatible interface with transistor to .24 transistor logic (TTL) levels is supplied along with indicator outputs.
1.2 Technical Specifications
1.2.1 General
The RC224ATLV modem is a full-featured, self-contained data/fax solution. No external microcontroller for data or fax control functions is required. Dialing, call progress, and telephone line interface functions are fully supported and controlled through the AT command set. Data modes perform complete handshake and data rate negotiations. All tone and pattern detection required by the applicable CCITT or Bell standard are supported. Fax modes support Group 3 fax requirements. Fax data and fax control (V .21 300 bps), performed by the modem, are controlled and monitored through the fax EIA-578 Class 1 command interface. Full HDLC formatting, flag insertion/deletion, and CRC generation/checking is provided. Both transmit and receive fax data is buffered within the modem. Fax data transfer to and from the DTE is flow controlled by X-on/X-off.
D224ATLVDSC
Conexant
1-1
1.0 Functional Description
1.2 Technical Specifications
RC224ATL/224ATLV
EmbeddedModem Family
1.2.2 Configurations and Rates
The supported modem configurations and signaling rates are listed in Table 1-1. In data modes with serial interface selected, DTE rate offsets of + 1%, - 2.5% are accommodated by adding/deleting stop bits as required. In fax modes, the DTE rate is 19,200 bps.
Table 1-1. Configurations and Rates Configuration
Data Mode V.22 bis V.22 Bell 212A Bell 103 Fax Mode V.29 V.27 ter V.21
Modulation
Transmitter Carrier Frequency (Hz) 0.01%
Answer 2400 2400 2400 2225 M 2025 S Receive N/A N/A 1800 1800 1650 M 1850 S Originate 1200 1200 1200 1270 M 1070 S Transmit 1700 1700 1800 1800 1650 M 1850 S
Data Rate (bps)
2400 1200 1200 300
Baud (Symbols/Sec.)
600 600 600 300
Bits Per Symbol
4 2 2 1
Constellation Points
16 4 4 1
QAM DPSK DPSK FSK
QAM QAM DPSK DPSK FSK
9600 7200 4800 2400 300
2400 2400 1600 1200 300
4 3 3 2 1
16 8 8 4 1
Legend: QAM DPSK FSK M S N/A
Quadrature Amplitude Modulation Differential Phase Shift Keying Frequency Shift Keying Mark condition Space Condition Not Applicable
1-2
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
1.0 Functional Description
1.2 Technical Specifications
1.2.3 Operation
Modem operation is controlled by AT commands, fax service class 1 commands, and supporting S registers. 1.2.3.1 Data Modes Data rate selection is determined by the speed of the originating and answering modems, as defined in Table 1-2.
Table 1-2. Data Rates vs. Connection Modem Rate Originate Modem Rate (bps)
300 1200 2400
Connect Speed Based on Answer Modem Rate (bps) 300
300 300 300
1200
300 1200 1200
2400
300 1200 2400
1.2.3.2 Fax Modes
Fax modes are negotiated as defined in T.30 and are implemented by AT+F commands. The AT+FCLASS=1 command causes entry into the fax mode from the data mode. Most other fax class 1 commands, which start with the AT+F prefix, are valid only in the fax mode. All data commands are valid in the fax mode except A/, On, &Tn, and the escape sequence (+++). The AT+FCLASS=0 command terminates the fax mode and causes entry into the data mode.
1.2.4 Data/Fax Auto Answering
The modem can automatically determine if the incoming call is from a data or fax modem, make the appropriate connection, and inform the DTE of the connection type.
1.2.5 Data Modulation
The data modulation conforms to V .29, V ter, V bis, V .27 .22 .22, V .21, Bell 212A, or Bell 103, depending on the selected configuration. Transmitter and receiver spectrum shaping is provided in accordance with the applicable standard.
1.2.6 Equalization
Automatic adaptive equalization and fixed compromised equalization are provided to compensate for line distortions and to minimize the effects of intersymbol interference.
1.2.7 Scrambler/Descrambler
The modem incorporates a self-synchronizing scrambler/descrambler, which satisfies the applicable CCITT or Bell requirements.
D224ATLVDSC
Conexant
1-3
1.0 Functional Description
1.2 Technical Specifications
RC224ATL/224ATLV
EmbeddedModem Family
1.2.8 Transmit Level
The transmit level is - 10 dBm 1 dB (at TIP and RING) and can be obtained using the circuits shown in Appendix A. Carrier and dual tone multi-frequency (DTMF) transmit levels can be further attenuated using AT%Ln + AT%Dn commands, respectively. If a higher transmit level is required, an external op amp can be added.
1.2.9 Transmit Tones
Answer Tone Guard Tone Calling Tone An answer tone of 2100 Hz (V bis, V .22 .22, or T.30) or 2225 Hz (Bell 212A or 103) is generated. An 1800 Hz guard tone can be generated in all data modes. An 1100 Hz (0.5 seconds on, 3 seconds off) calling tone (T.30) is generated in the originate fax mode.
1.2.10 Receive Level
The receiver satisfies performance requirements for a received signal from - 9 dBm to - 43 dBm. The carrier detect is ON at - 43 dBm and OFF at - 48 dBm with a minimum of 2 dB hysteresis.
1.2.11 Receiver Tracking
The modem can accommodate carrier frequency offset up to 7 Hz, and a transmit timing error of 0.01% (V bis or V ter) or 0.02% (V or Bell .22 .27 .22 212A). DTMF Dialing Ring Detection Standard DTMF tones (digits 0-9, A, B, C, D, *, and #) or pulses (digits 0-9) can be generated. Refer to Table 1-3. RING signal is detected from valid high to low transitions on the RING input line at frequencies of 15.3 Hz to 63 Hz. A RING is valid if the RING ON time is greater than 0.125 seconds and is followed by a RING OFF time greater than 0.5 seconds.
Table 1-3. Dial Digits/Tone Pairs (1 of 2) Dial Digit
0 1 2 3 4 5
Tone 1 Frequency (Hz)
941 697 697 697 770 770
Tone 2 Frequency (Hz)
1336 1209 1336 1477 1209 1336
1-4
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
Table 1-3. Dial Digits/Tone Pairs (2 of 2) Dial Digit
6 7 8 9 * # A B C D
1.0 Functional Description
1.2 Technical Specifications
Tone 1 Frequency (Hz)
770 852 852 852 941 941 697 770 852 941
Tone 2 Frequency (Hz)
1477 1209 1336 1477 1209 1477 1633 1633 1633 1633
1.2.12 Low Power Sleep Mode
To conserve power, the RC224ATLV has two selectable sleep (power-down) modes - Idle and Stop. If enabled by the IDLEN0 and IDLN1 inputs, the selective sleep mode is entered whenever the modem is active. The sleep mode indicator output, SLEEP, is provided to allow external circuits to be powered down when the modem is in Idle or Stop mode. The Idle mode allows reduced power consumption with automatic recovery without additional circuitry. If Idle mode is selected, the modem exits Idle mode and returns to full operation whenever a ring signal occurs, the DTE writes to the modem (parallel interface), or WAKEUP input, normally tied to DTR or TXD, is asserted (serial interface). The Stop mode further reduces power consumption, as defined in Table 1-4.
Table 1-4. Current and Power Requirements Current (ID) Mode Typical Current @ 25C
21 mA 5 mA 1 mA
Power (PD) Typical Power @ 25C
100 mW 25 mW 5 mW
Maximum Current @ 0C
22 mA 6 mA 1 mA
Maximum Power @ 0C
110 mW 30 mW 5 mW
Operating Sleep-Idle Sleep-Stop
NOTE(S):
1. Test conditions: VDD = 5.0 VDC for typical values; VDD = 5.25 VDC for maximum values. 2. Test conditions: VDD = 3.3 VDC for typical values; VDD = 3.6 VDC for maximum values.
D224ATLVDSC
Conexant
1-5
1.0 Functional Description
1.2 Technical Specifications
RC224ATL/224ATLV
EmbeddedModem Family
Entry
The modem will enter the low-power sleep mode when no line connection exists and no host activity occurs for the period of time specified in the S24 register. All EmbeddedModem circuits are turned off except the internal Microcontroller Unit (MCU) clock circuitry in order to consume lower power but are able to immediately wake up and resume normal operation. Wake-up occurs when a ring signal occurs, or the host write to the modem. Wake-up occurs when a ring signal occurs, or the DTE sends a character to the modem.
Wake-up--Parallel Interface Configuration Wake-up--Serial Interface Configuration
1-6
Conexant
D224ATLVDSC
2
2.0 Hardware Interface
Figure 2-1 and Figure 2-2 illustrate the RC224ATLV hardware interface signals for the parallel and serial interfaces, respectively. The RC224ATLV hardware interface signals are described in Table 3-5, Hardware Interface Signal Definitions. See Table 7-2, Timing-Host Bus Interface for a list of the host bus interface timing parameters and Figure 7-1, Timing Waveform for an illustration of the interface waveforms.
D224ATLVDSC
Conexant
2-1
2.0 Hardware Interface
RC224ATL/224ATLV
EmbeddedModem Family
Figure 2-1. RC224ATLV Signals--Parallel Interface
A/A1 XTLI Crystal XTLO RING TLKRELAY OHRELAY TXAI TXA2 RXA Telephone Line Interface
HDIS HCS HRD HWT HINT HA0 HA1 HA2 HD0 Host Computer Parallel BUS HD1 HD2 HD3 HD4 IDLEN0 HD5 IDLEN1 HD6 HD7 Sleep Mode Interface SLEEP RC224ATL RC224ATLV MODEM SPKR Optional Speaker Amplifier RFILO AGCIN
NVRCS NVRSK RESET NVRDIO Optional NVRAM
2-2
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
2.0 Hardware Interface
Figure 2-2. RC224ATLV Signals--Serial Interface
A/A1 XTLI Crystal XTLO RING TLKRELAY OHRELAY TXAI TXA2 AAE MR LED Indicators DCDL DTRL RFILO AGCIN RXA Telephone Line Interface
SPKR RXD CI/HS DCD V.24 EIA-232-D Interface DSR RI CTS TXD DTR SLEEP WAKEUP IDLEN0 IDLEN1 RC224ATL RC224ATLV MODEM
Optional Speaker Amplifier
Sleep Mode Interface
+5 V
NVRCS NVRSK RESET SEREN NVRDIO Optional NVRAM
D224ATLVDSC
Conexant
2-3
2.0 Hardware Interface
RC224ATL/224ATLV
EmbeddedModem Family
The parallel interface registers are identified in Table 2-1.
Table 2-1. Parallel Interface Registers (1 of 2) Register Number
7
Register Name
Scratch Register (SCR) Modem Status Register (MSR) Line Status Register (LSR) Modem Control Register (MCR) Line Control Register (LCR) Interrupt Identify Register (IIR) (Read Only)
Bit Number 7 6 5 4 3 2 1 0
Scratch Register Data Carrier Detect (DCD) 0 Ring Indicator (RI) Data Set Ready (DSR) Clear to Delta Data Send (CTS) Carrier Detect (DDCD) Framing Error (FE) Trailing Edge of Ring Indicator (TERI) Delta Data Set Ready (DDSR) Delta Clear to Send (DCTS)
6
5
Transmitter Transmitter Break Empty Holding Interrupt (TEMT) Register (BI) (THRE) 0 0 Local Loopback
Parity Error Overrun (PE) Error (OE)
Data Ready (DR)
4
0
Out 2
Out 1
Request to Data Send (RTS) Terminal Ready (DTR) Word Length Select Bit 1 (WLS1) Pending Interrupt ID Bit 0 (PL0) Enable Transmitter Holding Register Empty Interrupt (ETBEI) Word Length Select Bit 0 (WLS0) 0 if Interrupt Pending (IP) Enable Received Data Available Interrupt (ERBFI)
3
Divisor Latch Access Bit (DLAB) 0
Set Break (SB)
Stick Parity Even Parity Parity (SP) Select Enable (EPS) (PEN) 0 0 0
Number of Stop Bits (STB) Pending Interrupt ID Bit 1 (PL1) Enable Receiver Line Status Interrupt (ELSI)
2
0
1 Interrupt DLAB = 0 Enable Register (IER)
0
0
0
0
Enable Modem Status Interrupt (EDSSI)
0 Transmitter DLAB = 0 Holding Register (THR) 0 Receiver DLAB = 0 Buffer Register (RBR)
Transmitter Holding Register (Write Only)
Receiver Buffer Register (Read Only)
2-4
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
Table 2-1. Parallel Interface Registers (2 of 2) Register Number Register Name Bit Number 7 6 5 4 3 2
2.0 Hardware Interface
1
0
1 Divisor DLAB = 1 Latch MSB Register (DLM) 0 Divisor DLAB = 1 Latch LSB Register (DLL)
Divisor Latch (MS)
Divisor Latch (LS)
D224ATLVDSC
Conexant
2-5
2.0 Hardware Interface
2.1 Hardware Interface
RC224ATL/224ATLV
EmbeddedModem Family
2.1 Hardware Interface
2.1.1 Parallel Interface
A 16450 UART-compatible parallel interface is provided. Host Bus Interface Interrupt Enable Register (Addr=1, DLAB=0) Eight data lines, three address lines, and four control lines are supported. The Interrupt Enable Register (IER) enables four types of interrupts that can separately assert the HINT output. A selected interrupt can be enabled by setting the corresponding enable bit to a logic 1, or disabled by resetting the corresponding enable bit to a logic 0. All interrupt sources are disabled by setting bits 0-3 to a logic 0. Disabling all interrupts inhibits the Interrupt Identifier Register (IIR) and inhibits assertion of the HINT output. All other system functions operate normally, including the setting of the Line Status Register (LSR) and the Modem Status Register (MSR).
5
0
7
0
6
0
4
0
3
EDSSI
2
ELSI
1
ETBEI
0
ERBFI
Bits 4-7: EDSSI
Not used (always logic 0). Enable Modem Status Interrupt. When this bit is a logic 1, it enables assertion of the HINT output whenever bit 0, 1, 2, or 3 in the Modem Status Register (MSR) is a logic 1. When this bit is a logic 0, it disables assertion of HINT due to setting of any of these four MSR bits. Enable Receiver Line Status Interrupt. When this bit is a logic 1, it enables assertion of the HINT output when any receiver status bit in the Line Status Register (LSR); i.e., bits 1, 2, 3, or 4, changes state. When this bit is a logic 0, it disables assertion of HINT due to change of the receiver LSR bits. Enable Transmitter Holding Register Empty Interrupt. When this bit is a logic 1, it enables assertion of the HINT output when the Transmitter Holding Register Empty (THRE) bit in the Line Status Register (LSR5) is set to a logic 1. When this bit is a logic 0, it disables assertion of HINT due to LSR5. Enable Received Data Available Interrupt. When this bit is a logic 1, it enables assertion of the HINT output when received data is available in the Receiver Buffer; i. e., the Data Ready bit in the Line Status Register (LSR0) is a logic 1. When this bit is a logic 0, it disables assertion of HINT due to the LSR0.
ELSI
ETBEI
ERBFI
2-6
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
2.0 Hardware Interface
2.1 Hardware Interface
Interrupt Identifier Register (Addr = 2)
The Interrupt Identifier Register (IIR) identifies the existence and type of prioritized pending interrupts. Four priority levels are set to assist interrupt processing in the host. When addressed during chip-select time, the IIR freezes the highest priority interrupt pending and acknowledges no other interrupts until the particular interrupt is serviced by the host.
5
0
7
0
6
0
4
0
3
0
2
PL1
1
PL0
0
IP
Bits 3-7: PL0-1
Not used (always 0). Highest Priority Pending Interrupt. These two bits identify the highest priority pending interrupt. Priority Level (highest) 2 3 4
2 1 1 0 0 IP
1 1 0 1 0
Pending Interrupt Receiver Line Status Receiver Buffer Full Transmitter Holding Register Empty Modem Status
Interrupt Pending. When this bit is a logic 0, an interrupt is pending. When this bit is a logic 1, no interrupt is pending. This bit can be used in a hardwired prioritized or polled environment to indicate whether an interrupt is pending. If an interrupt is pending, the IIR contents can be used as a pointer to the appropriate interrupt service routine in the host.
D224ATLVDSC
Conexant
2-7
2.0 Hardware Interface
2.1 Hardware Interface
RC224ATL/224ATLV
EmbeddedModem Family
Line Control Register (Addr = 3)
7
DLAB
The Line Control Register (LCR) specifies the format of the asynchronous data communications exchange.
5
SP
6
SB
4
EPS
3
PEN
2
STB
1
WLS1
0
WLS0
DLAB
Divisor Latch Access Bit. This bit must be set to a logic 1 to access the Divisor latches of the baud generator during a read or write operation. It must be reset to a logic 0 to access the Receiver Buffer, the Transmitter Holding Register, or the Interrupt Enable Register. Set Break. When this bit is set to a logic 1, the transmit data is forced to the space (logic 0) state. The break is disabled by setting this bit to a logic 0. The Set Break bit acts only on the transmit data and has no effect on the serial in logic. Stick Parity. When stick parity is selected (LCR5 = 1), parity is enabled (LCR3 = 1), and even parity is selected (LCR4 = 1), the parity bit is transmitted and checked by the receiver as a logic 0. When stick parity is selected (LCR5 = 1), parity is enabled (LCR3 = 1), and odd parity is selected (LCR4 = 0), the parity bit is transmitted and checked by the receiver as a logic 1. Even Parity Select. When parity is enabled (LCR3 = 1), and Stick Parity (LCR5) is a logic 0, the number of logic 1s transmitted or checked in the data word bits and parity bit is either even (LCR4 = 1) or odd (LCR4 = 0). Parity Enable. When bit 3 is a logic 1, a parity bit is generated in the serial out (transmit) data stream and checked in the serial in (receive) data stream. The parity bit is located between the last data bit and the first stop bit. Number of Stop Bits. This bit specifies the number of stop bits in each serial out character. If bit 2 is a logic 0, one stop bit is generated regardless of word length. If bit 2 is a logic 1 when either a 5-, 6-, 7-, or 8-bit word length is selected, two stop bits are generated. The serial in logic checks the first stop bit only regardless of the number of stop bits selected.
SB
SP
EPS
PEN
STB
WLS0 and WLS1 Word Length Select. These two bits specify the number of bits in each serial in or serial out character. The encoding of bits 0 and 1 is: Bit 1 0 0 1 1
2-8
Bit 0 0 1 0 1
Word Length 5 Bits 6 Bits 7 Bits 8 Bits
D224ATLVDSC
Conexant
RC224ATL/224ATLV
EmbeddedModem Family
2.0 Hardware Interface
2.1 Hardware Interface
Modem Control Register (Addr = 4)
7
0
The Modem Control Register (MCR) controls the interface with the modem or data set.
5
0
6
0
4
LL
3
OUT2
2
OUT1
1
RTS
0
DTR
Bit 5-7: LL
Not used (always 0). Local Loopback. When this bit is set to a logic 1, the diagnostic mode is selected and the following occurs: 1. Data written to the Transmit Holding Register will be looped back to the Receiver Buffer Register. 2. The four modem control bits (CTS, DSR, RI, and DCD) are internally connected to the four modem control outputs (RTS, DTR, OUT1, and OUT2), respectively. Output 2. When this bit is a logic 1, HINT is enabled. When this bit is a logic 0, HINT is in the high impedance state. Output 1. This bit is used in local loopback (see MCR4). Request to Send. This bit controls the Request to Send (RTS) function. When this bit is a logic 1, RTS is on. When this bit is a logic 0, RTS is off. Data Terminal Ready. This bit controls the Data Terminal Ready (DTR) function. When this bit is a logic 1, DTR is on. When this bit is a logic 0, DTR is off.
OUT2
OUT1 RTS
DTR
D224ATLVDSC
Conexant
2-9
2.0 Hardware Interface
2.1 Hardware Interface
RC224ATL/224ATLV
EmbeddedModem Family
Line Status Register (Addr = 5)
7
0
The LSR, an 8-bit register, provides status information to the host concerning data transfer.
5
THRE
6
TEMT
4
BI
3
FE
2
PE
1
OE
0
DR
Bit 7: TEMT
This bit is set to logic 0. Transmitter Empty. This bit is set to a logic 1 whenever the Transmitter Holding Register (THR) and the Transmitter Shift Register (TSR) are both empty. It is reset to a logic 0 whenever either the THR or TSR contains a data character. Transmitter Holding Register Empty. This bit indicates that the modem is ready to accept a new character for transmission. In addition, this bit causes the modem to issue an interrupt to the host when the Transmit Holding Register Empty Interrupt Enable bit (IIR1) is set to logic 1. The THRE bit is set to a logic 1 when a character is transferred from the Transmitter Holding Register into the Transmitter Shift Register. The bit is reset to logic 0 concurrently with the loading of the Transmitter Holding Register by the host. Break Interrupt. This bit is set to a logic 1 whenever the received data input is a space (logic 0) for longer than two full word lengths plus 3 bits. The 81 indicator is reset whenever the host reads the LSR. Framing Error. This bit indicates that the received character did not have a valid stop bit. Bit 3 is set to a logic 1 whenever the stop bit following the last data bit or parity bit is detected as a zero bit. The FE bit is reset to a logic 0 whenever the host reads the LSR. Parity Error. This bit indicates that the received data character does not have the correct even or odd parity, as selected by the Even Panty Select bit (LCR4) and the Stick Parity bit (LCR5). The PE bit is set to a logic 1 upon detection of parity error and is reset to a logic 0 whenever the host reads the LSR. Overrun Error. This bit indicates that data in the Receiver Buffer Register was not read by the host before the next character was transferred into the Receiver Buffer Register, thereby destroying the previous character. The OE bit is reset whenever the host reads the LSR. Data Ready. This bit is set to a logic 1 whenever a complete incoming character has been received and transferred into the Receiver Buffer Register. Bit 0 is reset to a logic 0 when the host reads the Receiver Buffer Register.
THRE
BI
FE
PE
OE
DR
2-10
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
2.0 Hardware Interface
2.1 Hardware Interface
Modem Status Register (Addr = 6)
The Modem Status Register (MSR) reports the modem's current state and change information. Bits 4-7 supply current state, and bits 0-3 supply change information. The change bits are set to a logic 1 whenever a control input from the modem changes state from the last MSR read by the host. Bits 0-3 are reset to logic 0 when the host reads the MSR or upon reset. Whenever Bits 0,1, 2, or 3 are set to a logic 1, a Modem Status Interrupt is generated.
5
DSR
7
DCD
6
RI
4
CTS
3
DDCD
2
TERI
1
DDSR
0
DCTS
DCD
Data Carrier Detect. This bit indicates the logic state of the DCD output. If Loopback is selected (MCR4 = 1), this bit reflects the state of OUT2 in the MCR (MCR3). Ring Indicator. This bit indicates the logic state of the RI output. If Loopback is selected (MCR4 = 1), this bit reflects the state of OUT1 in the MCR (MCR2). Data Set Ready. This bit indicates the logic state of the DSR output. If Loopback is selected (MCR4 = 1), this bit reflects the state of DTR in the MCR (MCR0). Clear to Send. This bit indicates the logic state of the CTS output. If Loopback is selected (MCR4 = 1), this bit reflects the state of RTS in the MCR (MCR1). Delta Data Carrier Detect. This bit is set to a logic 1 when the DCD bit has changed since the MSR was last read by the host. Trailing Edge of Ring Indicator. This bit is set to a logic 1 when the RI bit changes from a 1 to a 0 state since the MSR was last read by the host. Delta Data Set Ready. This bit is set to a logic I when the DSR bit has changed state since the MSR was last read by the host. Delta Clear to Send. This bit is set to a logic 1 when the CTS bit has changed state since the MSR was last read by the host.
RI
DSR
CTS
DDCD
TERI
DDSR
DCTS
Receiver Buffer Register (Addr=0, DLAB=0) Transmitter Holding Register (Addr=0, DLAB=0)
The Receiver Buffer Register (RBR) is a read-only register at location 0 (with DLAB = 0). Bit 0 is the least significant bit of the data, and is the first bit received. The Transmitter Holding Register (THR) is a write-only register at address 0 when DLAB = 0. Bit 0 is the least significant bit and the first bit sent.
D224ATLVDSC
Conexant
2-11
2.0 Hardware Interface
2.2 Additional Information
RC224ATL/224ATLV
EmbeddedModem Family
Divisor Registers (Addr=0 and 1, DLAB=1)
The Divisor Latch LS Byte and Divisor Latch MS Byte are two read-write registers at locations 0 and 1 when DLAB = 1, respectively. The baud rate is selected by loading each divisor latch with the appropriate hex value. Table 2-2 lists the programmable values corresponding to the desired baud rate.
Table 2-2. Programmable Baud Rates Divisor Latch (Hex) MS
01 00 00 00
LS
80 C0 60 30
Divisor (Decimal)
384 192 96 48
Baud Rate
300 600 1200 2400
Scratch Register (SCR) (Addr = 7)
The Scratchpad Register is a read-write register at location 7. This register is not used by the DSP and can be used by the host for temporary storage.
2.1.2 Serial/Indicator Interface
A DTE serial interface and indicator outputs are supported. * Serial Interface: An 8-line V .24/EIA-232-D or TTL logic serial interface to the DTE is supported. * LED Indicator Interface: Four direct connect LED indicator outputs are supported.
2.1.3 Speaker Interface
A speaker output, controlled by AT or V bis commands, is provided for an .25 optional OEM-supplied speaker circuit.
2.1.4 Line Interface
The EmbeddedModem connects to the line interface circuitry by means of a receive analog input, two transmit analog outputs, and a ring signal input. The EmbeddedModem provides three relay control outputs to the line interface. These outputs may be used to control relays such as off-hook, A/A1, and talk/data.
2.2 Additional Information
Additional information is provided in the RC224ATLV Modem Designer's Guide (Order No. 821).
2-12
Conexant
D224ATLVDSC
3
3.0 Pin Descriptions
The RC224ATLV 68-pin PLCC serial and parallel pinouts are displayed in Figure 3-1 and Figure 3-2, respectively. The 100-pin PQFP serial and parallel pinout diagrams are displayed in Figure 3-3 and Figure 3-4, respectively. Figure 3-5 displays NVRAM timing. RC224ATLV 68-pin PLCC serial and parallel pin assignments are displayed in Table 3-1 and Table 3-2, respectively. The 100-pin serial and parallel pin assignments are displayed in Table 3-3 and Table 3-4, respectively.
Figure 3-1. 68-Pin PLCC Package--Serial
A/A1 NVRDIO NVRCS WAKEUP SEREN NC RING IDLEN0 DCDL RI MR NMI CI/HS DCD CTS DSR DGND2 AAE DTRL NC RXD RESET VCC NVRSK NC NC TXD DTR IDLEN1 RAGCO RADCI TSTBO RSTBO RRSTO 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 9 8 7 6 5 4 3 2 1 68 67 66 65 64 63 62 61
60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44
DGND1 XTLO XTLI TEST 2 SLEEP SPKR VAA MODEI TSTBI TRSTI TDACI RADCO RRSTI NC RSTBI NC
D224ATLVDSC
TRSTO MODEO TDACO NC TXA2 TXA1 RXA RFILO AGCIN VC NC TLKRELAY AGND OHRELAY NC SLEEPI RAGCI
Conexant
3-1
3.0 Pin Descriptions
RC224ATL/224ATLV
EmbeddedModem Family
Figure 3-2. 68-Pin PLCC Package--Parallel
A/A1 HA2 NVRCS HCS HWT HRD RING HD7 HD6 HD5 HD4 NMI HD3 HD2 HD1 HD0 DGND2 HA1 HA0 IDLEN0 NVRSK RESET VCC HINT HDIS NC NVRDIO NC IDLEN1 RAGCO RADCI TSTBO RSTBO RRSTO 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 9 8 7 6 5 4 3 2 1 68 67 66 65 64 63 62 61
60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44
DGND1 XTLO XTLI TEST 2 SLEEP SPKR VAA MODEI TSTBI TRSTI TDACI RADCO RRSTI NC RSTBI NC
3-2
TRSTO MODEO TDACO NC TXA2 TXA1 RXA RFILO AGCIN VC NC TLKRELAY AGND OHRELAY NC SLEEPI RAGCI
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
3.0 Pin Descriptions
Figure 3-3. 100-Pin PQFP Package--Serial
NC NC NC DGND NC NC TXD NC NC NVRSK NC VCC VCC RESET RXD NC DTRL AAE NC DGND DTR IDLEN1 RAGCO RADCI TSTBO NC NC NC RSTBO RRSTO TRSTO MODEO TDACO SLEEP NC DGND MODEI VAA SPKR NC AGND TXA2 TXA1 NC RXA NC RFILO AGCIN VC AGND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 DGND (A/A1) NVRDIO NVRCS WAKEUP SEREN NC NC RING IDLENO DCDL RI MR NC DGND NMI CI/HS DCD CTS DSR NC NC DGND DGND NC XTLO XTLI TEST
2
NC
D224ATLVDSC
NC NC NC NC NC TLKRELAY AGND OHRELAY NC NC SLEEPI RAGCI AGND RSTBI RRSTI RADCO TDACI TRSTI TSTBI NC
Conexant
3-3
3.0 Pin Descriptions
RC224ATL/224ATLV
EmbeddedModem Family
Figure 3-4. 100-Pin PQFP Package--Parallel
NC NC NC DGND NC NC NVRDIO NC HDIS HINT NC VCC VCC RESET NVRSK IDLENO HA0 HA1 NC DGND NC IDLEN1 RAGCO RADCI TSTBO NC NC NC RSTBO RRSTO TRSTO MODEO TDACO SLEEP NC DGND MODEI VAA SPKR NC AGND TXA2 TXA1 NC RXA NC RFILO AGCIN VC AGND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 DGND (A/A1) HA2 NVRCS HCS HWT HRD NC RING HD7 HD6 HD5 HD4 NC DGND NMI HD3 HD2 HD1 HD0 NC NC DGND DGND NC XTLO XTLI TEST
2
NC
3-4
NC NC NC NC NC TLKRELAY AGND OHRELAY NC NC SLEEPI RAGCI AGND RSTBI RRSTI RADCO TDACI TRSTI TSTBI NC
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
3.0 Pin Descriptions
Table 3-1. RC224ATL/224ATLV 68-Pin PLCC Pin Assignments--Serial Mode Pin Number
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
Signal Label
DCDL IDLEN0 RING NC SEREN WAKEUP NVRCS NVRDIO A/A1 AAE DTRL NC RXD RESET VCC NVRSK NC NC TXD DTR IDLEN1 RAGCO RADCI TSTBO RSTBO RRSTO TRSTO MODEO TDACO NC TXA2 TXA1 RXA RFILO DI DI DI DO DO DI DI DI DO DI DO DO DO D0 DI DI
I/O Type
Pin Number
35 36 37
Signal Label
AGCIN VC NC TLKRELAY AGND OHRELAY NC SLEEPI RAGCI NC RSTBI NC RRSTI RADCO TDACI TRSTI TSTBI MODEI VAA SPKR SLEEP 2 TEST XTLI XTLO DGND1 DGND2 DSR CTS DCD CI/HS NMI MR RI DO DO DO DO DI DO DO DI OD OD
I/O Type
-- -- --
--
38 39 40 41 42 43 44 45
--
--
MI TO RAGCO -- MI TO RSTBO -- MI TO RRSTO RADCO MI TO TADCO MI TO TRSTO MI TO TSTBO MI TO MODEO -- O(DF) DO DO DI 4.7K TO VCC IE OE -- --
--
46 47 48
--
49 50
-- --
51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67
MI TO RAGCI MI TO RADCO MI TO TSTBI MI TO RSTBI MI TO RRSTI MI TO TRSTI MI TO MODEI MI TO TDACI -- O (DD) O(DD) I(DA) --
68
D224ATLVDSC
Conexant
3-5
3.0 Pin Descriptions
RC224ATL/224ATLV
EmbeddedModem Family
Table 3-2. RC224ATLV 68-Pin PLCC Pin Assignments--Parallel Mode Pin Number
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
Signal Label
HD6 HD7 RING HRD HWT HCS NVRCS HA2 A/A1 HA1 HA0 IDLEN0 NVRSK RESET VCC HINT HDIS NC NVRDIO NC IDLEN1 RAGCO RADCI TSTBO RSTBO RRSTO TRSTO MODEO TDACO NC TXA2 TXA1 RXA RFILO DI DIO DO DO DO DI DIO DIO DI DI DI DI DO DI DO DI DI
I/O Type
Pin Number
35 36 37 38 39 40 41 42 43 44 45
Signal Label
AGCIN VC NC TLKRELAY AGND OHRELAY NC SLEEPI RAGCI NC RSTBI NC RRSTI RADCO TDACI TRSTI TSTBI MODEI VAA SPKR SLEEP 2 TEST XTLI XTLO DGND1 DGND2 HD0 HD1 HD2 HD3 NMI HD4 HD5 DIO DIO DIO DIO DI DIO DIO DI OD OD
I/O Type
-- -- --
--
--
MI TO RAGCO -- MI TO RSTBO -- MI TO RRSTO RADCO MI TO TADCO MI TO TRSTO MI TO TSTBO MI TO MODEO -- O(DF) OA OA 4.7k TO VCC IE OE -- --
--
46 47 48
--
49 50 51
--
52 53
--
54 55 56 57 58 59 60 61 62 63 64 65 66 67
MI TO RAGCI MI TO RADCO MI TO TSTBI MI TO RSTBI MI TO RRSTI MI TO TRSTI MI TO MODEI MI TO TDACI -- O (DD) O(DD) I(DA) --
68
3-6
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
3.0 Pin Descriptions
Table 3-3. RC224ATL/224ATLV 100-Pin PQFP Pin Assignments--Serial (1 of 4) Pin Number
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
NOTE(S):
(1) (2) (3) (4) (5) (6)
Signal Label
DTR IDLEN1 RAGCO RADCI TSTBO NC(3) NC NC RSTBO RRSTO TRSTO MODEO TDACO SLEEP DI DI
I/O Type(1)
MI(2) to RAGCI MI to RADCO MI to TSTBI -- -- -- MI to RSTBI MI to RRSTI MI to TRSTI MI to MODEI MI to TDACI DO -- DGND(4) MI to MODEO -- O(DF) -- AGND O(DD) O(DD) -- I(DA) -- --
NC
DGND MODEI VAA SPKR NC AGND TXA2 TXA1 NC RXA NC RFILO
I/O Types are described in Figure 7-5, Digital Interface Characteristics and Figure 7-6, Analog Interface Characteristics. MI = Modem Interconnection NC = No external connection (may have internal connection, leave pin disconnected (open)). AGND is analog ground and DGND is digital ground. Connect to VCC through 4.7 k. Connect ATL to + 5 VCC, ATLV to + 3 VCC.
D224ATLVDSC
Conexant
3-7
3.0 Pin Descriptions
RC224ATL/224ATLV
EmbeddedModem Family
Table 3-3. RC224ATL/224ATLV 100-Pin PQFP Pin Assignments--Serial (2 of 4) Pin Number
28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
NOTE(S):
(1) (2) (3) (4) (5) (6)
Signal Label
AGCIN VC AGND NC NC NC NC NC TLKRELAY AGND OHRELAY NC NC SLEEPI RAGCI AGND RSTBI RRSTI RADCO TDACI TRSTI TSTBI NC NC 2 TEST XTLI DO
(5)
I/O Type(1)
-- -- AGND -- -- -- -- -- OD AGND OD -- -- DI MI to RAGCO AGND MI to RSTBO MI to RRSTO MI to RADCI MI to TDACO MI to TRSTO MI to TSTBO -- --
IE
I/O Types are described in Figure 7-5, Digital Interface Characteristics and Figure 7-6, Analog Interface Characteristics. MI = Modem Interconnection NC = No external connection (may have internal connection, leave pin disconnected (open)). AGND is analog ground and DGND is digital ground. Connect to VCC through 4.7 k. Connect ATL to + 5 VCC, ATLV to + 3 VCC.
3-8
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
3.0 Pin Descriptions
Table 3-3. RC224ATL/224ATLV 100-Pin PQFP Pin Assignments--Serial (3 of 4) Pin Number
55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81
NOTE(S):
(1) (2) (3) (4) (5) (6)
Signal Label
XTLO NC DGND DGND NC NC DSR CTS DCD CI/HS NMI DGND NC MR RI DCDL IDLENO RING NC NC SEREN WAKEUP NVRCS NVRDIO (A/A1) DGND DGND DI DI DO DIO DO DGND DGND DO DO DO DI DI DO DO DO DO
(6)
I/O Type(1)
OE -- DGND DGND -- --
DGND --
-- --
I/O Types are described in Figure 7-5, Digital Interface Characteristics and Figure 7-6, Analog Interface Characteristics. MI = Modem Interconnection NC = No external connection (may have internal connection, leave pin disconnected (open)). AGND is analog ground and DGND is digital ground. Connect to VCC through 4.7 k. Connect ATL to + 5 VCC, ATLV to + 3 VCC.
D224ATLVDSC
Conexant
3-9
3.0 Pin Descriptions
RC224ATL/224ATLV
EmbeddedModem Family
Table 3-3. RC224ATL/224ATLV 100-Pin PQFP Pin Assignments--Serial (4 of 4) Pin Number
82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
NOTE(S):
(1) (2) (3) (4) (5) (6)
Signal Label
NC AAE DTRL NC RXD RESET VCC VCC NC NVRSK NC NC TXD NC NC DGND NC NC NC DGND DI DO DO IC
(6) (6)
I/O Type(1)
-- DO DO --
--
-- --
-- --
-- -- --
I/O Types are described in Figure 7-5, Digital Interface Characteristics and Figure 7-6, Analog Interface Characteristics. MI = Modem Interconnection NC = No external connection (may have internal connection, leave pin disconnected (open)). AGND is analog ground and DGND is digital ground. Connect to VCC through 4.7 k. Connect ATL to + 5 VCC, ATLV to + 3 VCC.
3-10
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
3.0 Pin Descriptions
Table 3-4. RC224ATL/224ATLV 100-Pin PQFP Pin Assignments--Parallel (1 of 4) Pin Number
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
NOTE(S):
(1) (2) (3) (4) (5) (6)
Signal Label
NC IDLEN1 RAGCO RADCI TSTBO NC(3) NC NC RSTBO RRSTO TRSTO MODEO TDACO SLEEP DI
I/O Type(1)
--
MI(2) to RAGCI MI to RADCO MI to TSTBI -- -- -- MI to RSTBI MI to RRSTI MI to TRSTI MI to MODEI MI to TDACI DO -- DGND(4) MI to MODEO -- O(DF) -- AGND O(DD) O(DD) -- I(DA) --
NC
DGND MODEI VAA SPKR NC AGND TXA2 TXA1 NC RXA NC
I/O Types are described in Figure 7-5, Digital Interface Characteristics and Figure 7-6, Analog Interface Characteristics. MI = Modem Interconnection. NC = No external connection (may have internal connection, leave pin disconnected (open)). AGND is analog ground and DGND is digital ground. Connect to VCC through 4.7 k. Connect ATL to + 5 VCC, ATLV to + 3 VCC.
D224ATLVDSC
Conexant
3-11
3.0 Pin Descriptions
RC224ATL/224ATLV
EmbeddedModem Family
Table 3-4. RC224ATL/224ATLV 100-Pin PQFP Pin Assignments--Parallel (2 of 4) Pin Number
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
NOTE(S):
(1) (2) (3) (4) (5) (6)
Signal Label
RFILO AGCIN VC AGND NC NC NC NC NC TLKRELAY AGND OHRELAY NC NC SLEEPI RAGCI AGND RSTBI RRSTI RADCO TDACI TRSTI TSTBI NC NC 2 TEST DI
(5)
I/O Type(1)
-- -- -- AGND -- -- -- -- -- DO AGND DO -- -- DI MI to RAGCO AGND MI to RSTBO MI to RRSTO MI to RADCI MI to TDACO MI to TRSTO MI to TSTBO -- --
I/O Types are described in Figure 7-5, Digital Interface Characteristics and Figure 7-6, Analog Interface Characteristics. MI = Modem Interconnection. NC = No external connection (may have internal connection, leave pin disconnected (open)). AGND is analog ground and DGND is digital ground. Connect to VCC through 4.7 k. Connect ATL to + 5 VCC, ATLV to + 3 VCC.
3-12
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
3.0 Pin Descriptions
Table 3-4. RC224ATL/224ATLV 100-Pin PQFP Pin Assignments--Parallel (3 of 4) Pin Number
54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80
NOTE(S):
(1) (2) (3) (4) (5) (6)
Signal Label
XTLI XTLO NC DGND DGND NC NC HD0 HD1 HD2 HD3 NMI DGND NC HD4 HD5 HD6 HD7 RING NC HRD HWT HCS NVRCS HA2 (A/A1) DGND DI DI DI DO DI DO DGND DIO DIO DIO DIO DI DIO DIO DIO DIO
(6)
I/O Type(1)
IE OE -- DGND DGND -- --
DGND --
--
I/O Types are described in Figure 7-5, Digital Interface Characteristics and Figure 7-6, Analog Interface Characteristics. MI = Modem Interconnection. NC = No external connection (may have internal connection, leave pin disconnected (open)). AGND is analog ground and DGND is digital ground. Connect to VCC through 4.7 k. Connect ATL to + 5 VCC, ATLV to + 3 VCC.
D224ATLVDSC
Conexant
3-13
3.0 Pin Descriptions
RC224ATL/224ATLV
EmbeddedModem Family
Table 3-4. RC224ATL/224ATLV 100-Pin PQFP Pin Assignments--Parallel (4 of 4) Pin Number
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
NOTE(S):
(1) (2) (3) (4) (5) (6)
Signal Label
DGND NC HA1 HA0 IDLENO NVRSK RESET VCC VCC NC HINT HDIS NC NVRDIO NC NC DGND NC NC NC DGND DIO DO DO DI DI DI DO IC
(6) (6)
I/O Type(1)
DGND --
--
--
-- --
-- -- --
I/O Types are described in Figure 7-5, Digital Interface Characteristics and Figure 7-6, Analog Interface Characteristics. MI = Modem Interconnection. NC = No external connection (may have internal connection, leave pin disconnected (open)). AGND is analog ground and DGND is digital ground. Connect to VCC through 4.7 k. Connect ATL to + 5 VCC, ATLV to + 3 VCC.
3-14
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
3.0 Pin Descriptions
Table 3-5. Hardware Interface Signal Definitions (1 of 5) Label I/O Type Signal Name/Description System Signals
XTLI XTLO RESET IE OE IC Crystal/Clock In and Crystal Out. The modem must be connected to an external crystal circuit consisting of a 16.000312 MHz crystal and two capacitors. Alternatively, XTLI may be driven with a buffered clock, in which case XTLO should be left open. Reset. The active low RESET input resets the internal modem logic. Upon RESET transitioning from high to low, modem operation returns to the state controlled by factory default values and stored values in NVRAM. During modem power-on, RESET must be held low for at least 5 ms after +5 VD and +5 VA operating voltage (see TSVD and +5 VA below) is attained for the modem top stabilize. When the serial interface is selected, RESET can be connected to an external RC network to cause the modem to reset upon power turn on. When the parallel interface is selected, RESET should be connected to the hose bus reset line. Serial Interface Enable. When the SEREN input is low, serial interface is selected upon reset. In this case, the serial interface signals should be connected to the V.24 (EIA-232-D) interface and LED indicators. Digital Supply. +5 V/3.3V ATLV 5% is required. Analog Supply. +5 V 5% is required. Digital and Analog Grounds.
SEREN
DI
VCC VAA DGND AGND
PWR GND
Sleep Mode Signals
IDLEN0 IDLEN1 DI DI Idle Enable 0 and Idle Enable 1. Encoded inputs enable or disable the sleep modes as follows: IDLEN1 L L H H IDLEN0 L H L H Mode Idle mode disabled Idle mode enabled Stop mode disabled Stop mode enabled
If Idle option is enabled, the modem will enter idle mode after 5 seconds of inactivity (WAKEUP must also be high for the serial interface). The modem will wakeup upon DTE activity (RXD for parallel mode and low on WAKEUP for serial mode) or the presence of RING. If Stop option is selected, the RING input becomes RING (i.e., the RING signal must be inverted). The modem will enter stop mode after 5 seconds of inactivity (and if WAKEUP is high for the serial interface). Only a 4 ms or longer pulse on the RING pin can wake up the modem from stop mode. SLEEP DO Sleep Mode. SLEEP output high indicates the modem is operating in its normal mode. SLEEP low indicates that the modem is in the sleep mode. The SLEEP output can also be used to control power to other devices. Sleep Mode. SLEEP input low causes the Integrated Analog (IA) to enter low-power sleep mode.
SLEEPI
DI
D224ATLVDSC
Conexant
3-15
3.0 Pin Descriptions
RC224ATL/224ATLV
EmbeddedModem Family
Table 3-5. Hardware Interface Signal Definitions (2 of 5) Label
WAKEUP
I/O Type
DI
Signal Name/Description
Wake Up. For serial interfaces only, WAKEUP input low removes the modem from the sleep mode (if in the sleep mode), or prevents the modem from entering the sleep mode (if not in the sleep mode). WAKEUP high allows the modem to enter sleep mode after 5 seconds of modem inactivity. WAKEUP is typically connected to DTR or TXD.
NVRAM Interface
NVRCS NVRSK NVRDIO DO DO DIO NVRAM Chip Select. NVRCS output high enables the NVRAM. NVRAM Shift Clock. The NVRSK output is used to shift data to or from the NVRAM. NVRAM Data In/NVRAM Data Out. NVRDIO is a bidirectional signal that carries both the serial input data from the NVRAM and the serial output data to the NVRAM. Depending on the specific NVRAM used, a resistor may be required between the NVRAM DO output pin and the modem NVRDIO bidirectional line. (Refer to Figure 3-5 and the NVRAM data sheet.)
Speaker Interface
SPKR O(DF) Speaker Analog Output. The SPKR output reflects the output of the receive analog signal. The SPKR output is turned on or off by the Speaker Control Option (Mn command), and the gain is controlled by the Speaker Volume Option (Ln command). When the speaker is turned off, the SPKR output is clamped to the voltage at the VC pin. The SPKR output can drive a load as low as 300 . Typically, the SPKR output is an input to an external LM386 audio power amplifier.
Asynchronous Serial Interface (Serial Interface Only; SEREN = Low)
RXD TXD DTR CTS DSR DCD CI/HS RI DO DI DI DO DO DO DO DO Received Data. The modem presents received serial data to the RXD output pin. Transmitted Data. The modem obtains serial data to be transmitted from the TXD pin. Data Terminal Ready. DTR input ON (low) indicates that the DTE is ready to operate. DTR input OFF (high) indicates that the DTE is not ready to operate. Clear to Send. In data modes, the CTS output is ON; in fax modes, CTS is optionally used for flow control. Data Set Ready. The DSR output is controlled by the AT&Sn command. Data Carrier Detected. The DCD output is controlled by the AT&C command. Calling Indicator/High Speed Indicator. CI/HS output ON (low) indicates modem connection at 2400 bps. Ring Indicator. RI output ON (low) indicates the presence of an ON segment of a ring signal on the telephone line. (The ring signal cycle is typically 2 seconds ON, 4 seconds OFF.) The OFF (high) condition of the RI output is maintained during the OFF segment of the ring cycle (between rings) and at all other times when ringing is not being received.
Serial Indicator Interface (Serial Interface Only; SEREN = Low)
AAE DO Auto Answer Enable. AAE output ON (low) indicates that modem auto answer mode has been enabled with the S0 = command. AAE high indicates auto answer has been disabled. The AAE output also indicates the status of the RI output. Modem Ready. MR output ON (low) indicates that the modem is ready; i.e., modem power is on and a test mode is not selected. In a test mode, the MR output pulses to indicate a test is in process.
MR
DO
3-16
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
Table 3-5. Hardware Interface Signal Definitions (3 of 5) Label
DCDL DTRL
3.0 Pin Descriptions
I/O Type
DO DO
Signal Name/Description
DCD Indicator. The DCDL output is controlled by the AT&C command. DTR Indicator. The DTRL output is controlled by the AT&D command.
Parallel Host Interface (Parallel Interface Only)
When the HWT input signal is connected to the host bus write line, the parallel interface is selected upon reset. (See Section 7.3, Interface Timing and Waveforms for waveform and timing information.) The parallel interface emulates a 16C450 UART; (See Table 2-1, Parallel Interface Registers). Parallel interface operation is equivalent to 16C450 operation with CS0 and CS1 inputs high and DISTR, DOSTR, and ADS inputs low. The corresponding RC224ATLV and 16C450 signals are shown below. 16C450 signals that are not required for RC224ATLV host computer operation are not shown. 16C450 Signal RC224ATLV Signal A0 - A2 HA0 - HA2 D0 - D7 HD0 - HD7 MR RESET (Active low) HCS CS2 DISTR HWT DOSTR HRD INTRPT HINT DDIS HDIS OUT2 None (Implemented internally in RC224ATLV) HA0-HA2 DI Host Bus Address Lines 0-2. During a host read or write operation, signals HA0-HA2 select an internal register. The state of the divisor latch access bit (DLAB) affects the selection of certain registers. Host Bus Data Lines 0-7. HD0-HD7 are comprised of eight tri-state I/O lines providing bidirectional communication between the host and the modem. Data, control words, and status information are transferred through HD0-HD7.
HD0-HD7
DIO
DLAB
0 0 X X X X X 1 1 HCS HRD HWT DI DI DI
HA2
0 0 0 0 1 1 1 0 0
HA1
0 0 1 1 0 0 1 0 0
HA0
0 1 0 1 0 1 1 0 1
Register
Receive Buffer Register (Read), Transmitter Holding Register (Write) Interrupt Enable Register Interrupt Identification Register (Read Only) Line Control Register Modem Control Register Line Status Register (Read Only) Scratch Register Divisor Latch Register (Least Significant Byte) Divisor Latch Register (Most Significant Byte)
Host Bus Chip Select. HCS input low enables reading from or writing to the modem using the parallel bus. Host Bus Read. HRD is an active low read control input. When the modem is selected with HCS, HRD low allows status or data words to be read from an addressed register. Host Bus Write. HWT is an active low write control input. When the modem is selected with HCS, HWT low allows data or control words to be written to an addressed register.
D224ATLVDSC
Conexant
3-17
3.0 Pin Descriptions
RC224ATL/224ATLV
EmbeddedModem Family
Table 3-5. Hardware Interface Signal Definitions (4 of 5) Label
HDIS
I/O Type
DO
Signal Name/Description
Host Bus Driver Disable. HDIS output is low when the host is reading data from the modem over the host data bus (both HRD and HCS are low). HDIS is also used to disable the external transceiver drivers whenever data is not being read from the modem. Host Bus Interrupt. HINT output is 16C450-compatible output indicating interrupt status and is enabled by the OUT2 bit set to a 1 in the Modem Control Register.
HINT
DO
Telephone Line Interface
TXA1 TXA2 O(DF) Transmit Analog 1 and 2. The TXA1 and TXA2 outputs are differential outputs. A 600 telephone coupling transformer may be driven directly without the need for external discrete buffer amplifiers. Both TXA1 and TXA2 outputs are turned off when the transmitter is disabled or during local analog loopback. Receive Analog. RXA is a single-ended receive data input from the telephone line interface. Centerpoint Voltage. A +2.5 VDC centerpoint voltage derived from an internal reference voltage. The TXA1 and TXA2 outputs are biased at VC. Talk/Data Relay Driver. TLKRELAY is an open drain output which can directly drive a relay with greater than 360 coil resistance and has "must operate" voltage of no greater than 4.0 VDC. A heavier load, such as an electro-mechanical relay, requires the use of an external transistor. An external diode should be provided across the relay coil. The TLKRELAY output is clamped off during power-on reset or the sleep mode. The TLKRELAY output is activated and deactivated at the same time as the OHRELAY output. In a typical application, TLKRELAY ON opens the normally closed Talk/Data relay and disconnects the handset from the telephone line. Off-Hook Relay Driver. OHRELAY is an open drain output which can directly drive a relay with greater than 360 coil resistance and has "must operate" voltage of no greater than 4.0 VDC. A heavier load, such as an electro-mechanical relay, requires the use of an external transistor. An external diode should be provided across the relay coil. The OHRELAY output is clamped off during power-on reset or the sleep mode. In a typical application, OHRELAY ON closes the normally open Off-Hook relay and connects the modem to the telephone line (off-hook). Ring Detector. RING is a TTL-compatible input used to indicate to the modem that a 15.3 Hz to 63 Hz ringing signal is present. The signal (a 4N35 optoisolator compatible output) into the RING input should not respond to a voltage less than 40 VRMS, 15 Hz to 68 Hz, appearing across TIP and RING with respect to ground. A low-going edge on the RING input also removes the modem from the sleep mode. Key Telephone Hold Indicator. A/A1 output low indicates that the telephone line is in use when used on multi-line key telephones.
RXA VC TLKRELAY
I(DA) OA DO
OHRELAY
DO
RING
DI
A/A1
DO
3-18
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
Table 3-5. Hardware Interface Signal Definitions (5 of 5) Label I/O Type Signal Name/Description Modem Interconnect
RFILO MI
3.0 Pin Descriptions
Receive Filter Output. RFILO is the output of the internal receive anti-aliasing filter which must be connected to AGCIN through a 0.1 F, 20%, DC decoupling capacitor. The 1000 pF capacitor to ground provides noise immunity at low noise levels. Receive AGC Gain Amplifier Input. See RFILO. Mode Control. Direct modem interconnect line. Transmitter DAC Signal. Serial digital DAC signal. Direct modem interconnect line. Transmitter Strobe. 576 kHz digital transmitter timing reference. Direct modem interconnect line. Transmitter Reset. 9.6 kHz, 8228.57 Hz, or 7.2 kHz digital transmitter timing reference. Direct modem interconnect line. Receiver ADC Signal. Serial digital ADC signal. Direct modem interconnect line. Receiver AGC Signal. Serial digital AGC signal. Direct modem interconnect line. Receiver Reset. 9.6 kHz, 8228.57 Hz, or 7.2 kHz digital receiver timing reference. Direct modem interconnect line. Receiver Strobe. 576 kHz digital receiver timing reference. Direct modem interconnect line.
AGCIN MODEO (DSP), MODEI (IA) TDACO (DSP), TDACI (IA) TSTBO (DSP), TSTBI (IA) TRSTO (DSP), TRSTI (IA) RADCI (DSP), RADCO (IA) RAGCO (DSP), RAGCI (IA) RRSTO (DPS), RRSTI (IA) RSTBO (DSP), RSTBI (IA)
MI MI MI MI MI MI MI MI MI
D224ATLVDSC
Conexant
3-19
3.0 Pin Descriptions
RC224ATL/224ATLV
EmbeddedModem Family
Figure 3-5. NVRAM Timing
(1)
4S
NVRSK
tDIS 0.4S tDIH 0.4S tDIH 0.4S
NVRDI
tCSS 0.2S tDIS 0.4S tCSH 0.0S
NVRCS
tPDO 2S tPDO 2S
NVRDO
NOTE(S): (1) This is the minimum NVRSK period.
3-20
Conexant
D224ATLVDSC
4
4.0 AT Commands
Each command line must start with the AT prefix and be terminated with a carriage return (CR). Several commands may be included on one command line. A command line may contain up to 40 characters, excluding the AT prefix and the terminating CR. A separator is not required between data commands. A semicolon (;) separator is required between fax commands. AT commands are composed of 10-bit ASCII encoded asynchronous characters. The character format in data mode is 8 data bits with no parity, or 7 data bits with even, odd, or no (two stop bits) parity, at a data rate of 19,200, 2400, 1200, or 300 bps. The character format in fax mode is 8 data bits with no parity at 19,200 bps. Table 4-1 lists result codes and messages. Table 4-2 summarizes the AT command set. Table 4-3 summarizes the fax command set.
Table 4-1. Result Codes and Messages Digital Code
0 1 2 3 4 OK CONNECT RING NO CARRIER ERROR
Word Code
Meaning
Command line executed without errors Connection at 300 bps Ringing signal detected Carrier lost or never present Invalid command, checksum, error in command line, or command line exceeds 40 characters Connection at 1200 bps No dial tone detected Busy signal detected No silence detected when dialing a system not providing a dial tone Connection at 2400 bps Fax carrier error Connected as data modem during auto answer Connected as fax modem during auto answer
5 6 7 8 10 +F4 13 15
CONNECT 1200 NO DIALTONE BUSY NO ANSWER CONNECT 2400 +FCERROR DATA FAX
D224ATLVDSC
Conexant
4-1
4.0 AT Commands
RC224ATL/224ATLV
EmbeddedModem Family
Table 4-2. AT Command Set Summary (1 of 5) Command
A/ A AT Bn
Function
Re-execute command Answer a call Command line prefix Parameters: none Select CCITT or Bell Mode Parameters: n = 0,1
Default
-- -- -- n=1
Parameters/Description
-- -- Attention Code. Precedes the command line except for +++ (escape) and A/ (repeat) commands. n=0 n=1 Selects CCITT operation at 300 or 1200 bps during Call Establishment and a subsequent connection. Selects BELL operation at 300 or 1200 bps during Call Establishment and a subsequent connection. -- Dial Command. D causes the modem to dial the number which follows the D in the command line. Valid dial characteristics are 0 to 9, A to D, #, and *. Other valid dial modifier characters are "," P, R, S=n, T, W, ";", @, and !. -- n=0 n=1 n=0 n=1 n=0 n=1 n=0 n=1 n=2 Disables command echo. Enables command echo. Returns ERROR result code. Returns OK result code. Modem on-hook (relay open). Modem off-hook (relay closed). Reports product identification code. Calculates the ROM checksum. Calculates the ROM checksum and compares it with the prestored checksum. Reports "OK" if the calculated checksum equals the prestored checksum or if the prestored checksum value is FFh; otherwise reports "ERROR". Reports the firmware version and ROM part number. Low volume. Low volume. Medium volume. High volume. Speaker is always off. Speaker is on during Call Establishment, but off when receiving carrier. Speaker is always on. Speaker is on after dialing, until carrier is detected. On-line state. On-line state with equalizer retrain. -- n=0 n=1 Enables result codes to the DTE. Disables result codes to the DTE.
Cn D
Carrier control Parameters: n = 0,1
n=1
--
--
Dn En Fn Hn In
Dial modifier Command echo Parameters: n = 0,1 On-line character echo option Parameters: n = 0,1 Disconnect (hang-up) Parameters: n = 0,1 Identification Parameters: n = 0,1,2,3
-- n=1 n=1 n=0 n=0
n=3 Ln Speaker volume Parameters: n = 0,1,2,3 n=2 n=0 n=1 n=2 n=3 n=0 n=1 n=2 n=3 On P Qn Go on-line Parameters: n = 0,1 Force pulse dialing Quiet Result codes control -- -- n=0 n=0 n=1
Mn
Speaker control Parameters: n = 0,1,2,3
n=1
4-2
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
Table 4-2. AT Command Set Summary (2 of 5) Command
Sn
4.0 AT Commands
Function
Select S register as default Range: n = 0-27 Parameters: none Range: n = 0-27 (register no.) x=0-255 (value) Parameters: none Range: n = 0-27 Force DTMF dialing Report codes form Extended result codes
Default
-- n n=v n?
Parameters/Description
Establishes S-Register n as the last register accessed. Sets S-Register n to the value v. Reports the value of S-Register n.
Sn =
--
Writes to an S Register. Sr=x sets register "n" to the value "x". Configuration registers are provided to retain modem configuration parameters. The contents of these registers can be modified with this command. Reads an S register. Sn? causes the contents stored in register "n" to be returned. -- n=0 n=1 n=0 Result code is sent as a digit. Result code is sent as ASCII text. Basic set of result codes 0-4 are enabled. The modem blind dials and sends the appropriate connect result code once a satisfactory connection is established. Dial tone and busy are not recognized. Result codes 0-5 and 10 are enabled. The modem blind dials and sends the appropriate connect result code once a satisfactory connection is established. Dial tone and busy are not recognized. Result codes 0-6 and 10 are enabled; dial tone detected. The modem waits for a dial tone before dialing, then sends the appropriate result code once a satisfactory connection is established. The busy result code is sent if a busy signal is detected. Result codes 0-5, 7 and 10 are enabled; busy signal detected; dial tone not detected. The modem blind dials and sends the appropriate connect result code once a satisfactory connection is established. The busy result code is sent if a busy signal is detected. Result codes 0-7 and 10 are enabled; busy signal and dial tone detected. The modem waits for a dial tone before dialing, then sends the appropriate result code once a satisfactory connection is established. The NO DIALTONE result code is sent if the dial tone is not detected within 5 seconds. The BUSY result code is sent if a busy signal is detected. Disables long space disconnect. Enables long space disconnect. Soft reset. Restores stored profile 0. Soft reset. Restores stored profile 1. RLSD remains ON at all times. RLSD follows the state of the carrier.
Sn? T Vn Xn
-- -- n=1 n=4
n=1
n=2
n=3
n=4
Yn Zn &Cn
Long space disconnect Soft reset and restore profile RLSD (DCD) option
n=0 n=0 n=0
n=0 n=1 n=0 n=1 n=0 n=1
D224ATLVDSC
Conexant
4-3
4.0 AT Commands
RC224ATL/224ATLV
EmbeddedModem Family
Table 4-2. AT Command Set Summary (3 of 5) Command
&Dn
Function
DTR option
Default
n=0 n=0 n=1 n=2
Parameters/Description
Modem ignores DTR. Modem assumes command state when ON-to-OFF transition is detected on DTR. Modem hangs up, assumes command state and disables auto-answer upon detecting ON-toOFF transition on DTR. Modem assumes software reset state upon detecting ON-to-OFF transition on DTR.
n=3 &F Recall (restore) factory profile --
S Registers: S0=1, S1=0, S2=43. S3=13, S4=10, S5=8, S6=0, S7=30, S8=2, S9=5, S10=14, S11=95, S12=50, S18=0, S25=5, S26=1 Commands: B1, C1, E1, F1, L2, M1, P, Q0, V1, Y0, X4, &C0, &D0, &G0, &J0, &M0/&G0, &P0, &R0, &S0, &T4, &X0
&Gn
Select guard tone
n=0
n=0 n=1 n=2 n=0 n=1 n=0 n=0 n=1 n=2 n=3 n=0 n=1
No guard tone. 550 Hz guard tone. 1800 Hz guard tone. Suitable for RJ11, RJ41S. or RJ45S type phone jack. Suitable for RJ12 or RJ13 type phone jack; the A lead is connected to A1 lead while the modem is off-hook. Requests dial-up operation. Asynchronous operation. Reserved Reserved Reserved Selects 39%-61% make/break ratio at 10 pps. (USA/Canada) Selects 33%-67% make/break ratio at 10 pps. (UK/HK) Idle State Normal Reserved Reserved Reserved On-line State Asynchronous Reserved Reserved Reserved
&Jn
Telephone jack control
n=0
&L0 &Mn
Dial-up line operation Asynchronous mode
n=0 n=0
&Pn
Pulse dial make/break ratio
n=0
&Q0
Asynchronous mode
n=0 n=0 n=1 n=2 n=3
&Sn
DSR override
n=0
n=0 n=1
DSR will remain ON at all times. DSR will become active after answer tone has been detected and inactive after the carrier has been lost. DSR is OFF when the modem is in test mode or idle state.
4-4
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
Table 4-2. AT Command Set Summary (4 of 5) Command
&Tn
4.0 AT Commands
Function
Test and diagnostic
Default
n=4 n=0 n=1 n=2 n=3 n=4 n=5 n=6 n=7 n=8
Parameters/Description
Terminates test in progress. Initiates local analog loopback. Returns ERROR. Initiates local digital loopback. Enables digital loopback acknowledgment from remote modem for RDL. Disables digital loopback acknowledgment from remote modem for RDL. Initiates remote digital loopback.(1) Initiates remote digital loopback with self test.(1) Initiates local analog loopback with self test.(1)
&V
Display current configurations
--
Example: AT&V ACTIVE PROFILE: B0 E1 L1 M1 QO T V1 Y0 &C0 &D0 &G2 &J0 &L0 &P0 &Q0 &R0 &S0 &X0 &Y0 S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:030 S08:002 S09:006 S10:014 S12:050 S14:AAH S16:00H S18:000 S21:00H S22:76H S23:17H S25:005 S26:001 S27:40H STORED PROFILE 0: B1 E1 L2 QO V1 X4 Y0 &C0 &D0 &G0 &J0 &L0 &P0 &Q0 &R0 &S0 &X0 S00:000 S14:AAH S18:000 S21:00H S22:76H S23:17H S25:005 S26:001 S27:40H STORED PROFILE 1: B1 E1 L2 QO V1 X4 Y0 &C0 &D0 &G0 &J0 &L0 &P0 &Q0 &R0 &S0 &X0 S00:000 S14:AAH S18:000 S21:00H S22:76H S23:17H S25:005 S26:001 S27:40H TELEPHONE NUMBERS: &Z0= 5551212 &Z1= &Z2= &Z3= Commands: Bn, En, Ln, Mn, P or T, Qn, Vn, Yn, &Cn &Dn, &Gn, &Jn, &Ln, &Pn, &Qn, &Rn, &Sn &Xn &Yn Registers: S0, S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S12, S14, S16, S18, S21, S22, S23, S25, S26, S27 n=0 n=1 Stores active profile in location 0. Stores active profile in location 1. Reserved Reserved Reserved The modem will use profile 0 on powerup. The modem will use profile 1 on powerup.
&Wn
Store current configuration
n=0
&X0
Asynchronous data transmission Select default profile Store dial string to location n
n=0
n=0 n=1 n=2 n=0 n=1
&Yn &Zn = x
-- --
&Zn = x n = 0 to 3 and x = dial string. (up to 36 characters)
D224ATLVDSC
Conexant
4-5
4.0 AT Commands
RC224ATL/224ATLV
EmbeddedModem Family
Table 4-2. AT Command Set Summary (5 of 5) Command
%Dn %J %Ln
Function
DTMF Level Attenuation Load Secondary Defaults Transmit Level Attenuation Function
Default
-- -- --
Parameters/Description
-- -- --
Dial Modifier
P R S=n
Pulse Dial Parameters: none Originate Call in Answer Mode Parameters: none Dial Stored Number Parameters: n = 0, 1, 2, 3 S S= S=n where n = 0-3
-- -- --
-- -- --
T W ; @
Tone Dial Parameters: none Wait for Dial Tone Parameters: none Return to Idle State Parameters: none Wait for Quiet Answer Command Parameters: none Flash Hook Parameters: none Pause Parameters: none Dial Digits/Characters Parameters: none
-- -- -- --
-- -- -- --
! , (comma) 0-9, A, B, C, D, #, *
NOTE(S):
(1)
-- -- --
-- -- --
Not available for 300 bps.
4-6
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
4.0 AT Commands
Table 4-3. Fax Command Set Summary (1 of 2) Fax Command
+FCLASS=n
Function
Service class
Default
n=0
Parameters/Description
Select Service Class. +FCLASS=n command sets the active service class. +FCLASS=0 Returns to data mode +FCLASS=1 Fax Class 1 +FCLASS=2 Fax Class 2 (Not supported) +FCLASS=3 Fax Class 3 (Not supported) Report Active Configuration. +F? interrogates the modem to determine the active configuration. The responses are: +FAA? 0 if auto answer is disabled; 1 if auto answer is enabled +FCLASS 0 if in data mode; 1 if in fax class 1 +FF? 0 if flow control off; 1 if flow control on Report Operating Capabilities. +F=? can be used to determine the operating capabilities of the modem. The responses are: +FAA=? 0, 1 +FCLASS=? 0, 1 +FTM=? 24, 48, 72, 96 +FTM=? 24, 48 +FTH=? 3 +FTH=? 3 +FF=? 0,1 Data/Fax Auto Answer. +FAA command configures the modem to automatically detect whether an incoming call is from a data modem or a fax modem. This command is valid in both data and fax modes. n = 0 Disable data/fax auto answer mode (default). n = 1 Enable data/fax auto answer mode. The modem determines calling type and issues DATA result code (13) if caller is a data modem, or issues FAX result code (15) in the caller is a fax modem. Enhanced Flow Control. +FF=n command enables an enhanced flow control mode for data transfer between the DTE and DCE. n = 0 Disables enhanced flow control interface. In this mode, data transfer is compatible with the EIA-578 standard. n = 1 Enables enhanced flow control. Stop Transmission and Wait. +FTS=n causes the modem to terminate a transmission. After temination the modem waits for n 10-ms intervals before responding with the OK result code. An ERROR response code results if this command is issued while the modem is on-hook. Receive Silence. +FRS=n causes the modem to report back to the DTE with an OK result code after n 10-millisecond intervals of silence have been detected on the line. This command is aborted if any command character is received. The modem discards the aborting character and issues an OK result code. An ERROR response code results if this command is issued while the modem is on-hook.
+F?
Report Active Configuration
--
+F=?
Report Operating Capabilities
--
+FAA=n
Data/Fax Auto Answer
n=0
+FF
Enhanced Flow Control
n=0
+FTS=n
Stop Transmission and Wait
n=0
+FRS=n
Receive Silence
n=0
D224ATLVDSC
Conexant
4-7
4.0 AT Commands
RC224ATL/224ATLV
EmbeddedModem Family
Table 4-3. Fax Command Set Summary (2 of 2) Fax Command
+FTM=n
Function
Transmit Data
Default
n = 48
Parameters/Description
Transmit Data. +FTM=n causes the modem to transmit data using the modulation defined below. An ERROR response code results if this command is issued while the modem is on-hook. +FTM=24 V.27 ter 2400 bps +FTM=48 V.27 ter 4800 bps +FTM=72 V.29 7200 bps +FTM=96 V.29 9600 bps Receive Data. +FRM=n causes the modem to enter the receiver mode using the modulation defined below. An ERROR response code results if this command is issued while the modem is on-hook. +FRM=24 V.27 ter 2400 bps +FRM=48 V.27 ter 4800 bps +FRM=72 V.29 7200 bps (Not supported(1)) +FRM=96 V.29 9600 bps (Not supported(1)) Transmit Data with HDLC Framing. +FTH=n causes the modem to transmit data framed in HDLC protocol using the modulation defined below. An ERROR response code results if this command is issued while the modem is on-hook. +FTH=3 V.21 Channel 2300 bps Receive Data with HDLC Framing. +FRH=n causes the modem to receive frames in HDLC protocol using the modulation defined below. An ERROR response code results if the command is issued while the modem is on-hook. +FRH=3 V.21 Channel 2300 bps Receive Test Data. +FRTn causes the modem to go off-hook and begin demodulating received data at the specified rate. n Configuration/Data Rate V.27 ter 2400 bps n = 24 n = 48 V.27 ter 4800 bps Transmit Test Data. +FTTn = m causes the modem to transmit a continuous test pattern at the specified rate. The transmission will terminate by a DTE abort (i.e., any character recognized at the DTE interface). n Configuration/Data Rate V.27 ter 2400 bps n = 24 V.27 ter 4800 bps n = 48 n = 72 V.29 7200 bps n = 96 V.29 9600 bps m Test Pattern ASCII data (20h - 7Fh sequential) m=0 All zeros m=1 All ones m=2 m=3 Alternate 10 Sliding 0 (01111) m=4 m=5 Sliding 1 (00001)
+FRM=n
Receive Data
n = 48
+FTH=n
Transmit Data with HDLC Framing
n=3
+FRH=n
Receive Data with HDLC Framing
n=0
+FRTn
Receive Test Data
n = 48
+FTTn = m
Transmit Test Data
n = 96 m=0
NOTE(S):
(1)
Modem will respond with ERROR result code.
4-8
Conexant
D224ATLVDSC
5
5.0 S Registers
The S register commands are summarized in Table 5-1. The range of possible values and the factory default value for each S register are also shown. The factory default values are used whenever the &F command is received or a parity error is detected in the NVRAM upon modem power turn-on. The user-defined S registered default values are used at modem power turn-on or when a modem reset is received. If the NVRAM is not available or contains a parity error, the factory default S register values are used. The S registers are described in Table 5-2. Reading an S Register The command Sn? reads the current value of an S register, where "n" is the decimal number of the register. Example: To read the current value in register S0 (Ring to Answer On) and S7 (Wait Time for Data Carrier), perform the following: Enter: AT S0? S7? (Value in register S0? Value in register S7?) A typical response to the might be: Result: 001 (modem will answer on first ring) Result: 030 (modem will wait 30 seconds for a carrier) Result: OK (command completed)
D224ATLVDSC
Conexant
5-1
5.0 S Registers
RC224ATL/224ATLV
EmbeddedModem Family
Table 5-1. S Register Summary Register S0(1) S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S14(1) S16 S17 S18(1) S19 S20 S21(1) S22(1) S23(1) S24 S25(1) S26(1) S27(1) S28(1)
NOTE(S):
(1)
Range 0-255 0-255 0-127 0-127 0-127 0-32, 127 2-255 1-255 0-255 1-255 1-255 50-255 0-255 Bit Mapped Bit Mapped 0-250 0-255 0-1 0-127 Bit Mapped Bit Mapped Bit Mapped 0-255 0-255 0-255 Bit Mapped Bit Mapped Rings Rings ASCII ASCII ASCII ASCII
Units
Default 00 00 43 13 10 08 02 30 02 06 14 95 50 AA hex 00 00 00 00 00 00 76 hex 07 00 05 1 40 hex 00
Description Rings to Auto-Answer Ring Counter Escape Character Carriage Return Character Line Feed Character Backspace Character Maximum time to Wait for Dial Tone Wait for Carrier Pause Time for Comma Carrier Detect Response Time Carrier Loss Disconnect Time DTMF Dialing Speed Escape Prompt Delay General Bit Mapped Options Test Mode Bit Mapped Options (&T) Fax Mode Null Byte Timer Test Timer Conexant Protocol Interface Speed Fax Mode Inactivity Timer General Bit Mapped Options General Bit Mapped Options General Bit Mapped Options Sleep Inactivity Timer Delay to DTR Off RTS-to-CTS Delay General Bit Mapped Options General Bit-Mapped Options
Seconds Seconds Seconds 1/10 seconds 1/10 seconds ms 1/50 seconds None None 4 ms increments Seconds None Seconds None None None Seconds 0.1 or 1 seconds 0.01 seconds None None
Register value may be stored in one of two user profiles with the AT&W command.
5-2
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
5.0 S Registers
Table 5-2. S Register Description (1 of 8) Register
S0
Default
00
Range
0-255
Units
Rings
Description Ring to Answer On. Assigning S0 a value from 1 to 255 places the modem in auto-answer mode. The modem will auto answer after the specified number of rings has occurred.
Setting S0 to 0 disables auto-answer.
S1
00
0-255
Rings
Ring Count. S1 is incremented each time a ring is detected. It will be cleared if no ring occurs within 8 seconds after the last ring. Escape Code Character. S2 holds the ASCII value used for the escape code. The + character responds to the factory default value. Values greater than 127 disable the escape code operation. To enter the command mode when the escape code is disabled, a loss of carrier must occur or DTR must be set to a 0 (dependent on &D command). Carriage Return Character. S3 holds the ASCII value for the carriage return; 13 is the standard value. The character in S3 is both the command line terminator and the result code terminator. Line Feed Character. S4 holds the ASCII value for the line feed. The line feed character is output after the carriage return only when English word result codes have been selected (V1). If a line feed character is not desired, it may be changed to a null, but it cannot be totally disabled. Backspace Character. S5 holds the ASCII value for the backspace character. This character is both the backspace key and the character echoed to move the cursor back one position. Normally a value of 8 is used. The backspace character must not be set to a value corresponding to a printable ASCII character (i.e., between 33 and 126) or to a value greater than 127. A backspace is used as follows:
The keystroke is echoed back to the terminal and the cursor moved back over the last character entered. The last character in the command buffer is deleted.
S2
43
0-127
ASCII
S3
13
0-127
ASCII
S4
10
0-127
ASCII
S5
08
0-32, 127
ASCII
S6
02
2-255
Seconds
Wait for Dial Tone. S6 specifies the wait time before dialing. The delay allows time for the dial tone to occur on the telephone line. The minimum time is 2 seconds. Values greater than 2 seconds may be necessary if trouble is encountered getting dial tones. Wait for Carrier After Dial. S7 specifies the delay time that the modem waits for the carrier signal from the remote modem before hanging up. Typically, a delay time of 30 seconds is enough, but it can be extended to 255 seconds. If the carrier is not detected within the specified time period, the modem hangs up and sends the NO CARRIER result code. If carrier is detected, the modem returns the CONNECT result code and goes on-line.
S7
30
1-255
Seconds
D224ATLVDSC
Conexant
5-3
5.0 S Registers
RC224ATL/224ATLV
EmbeddedModem Family
Table 5-2. S Register Description (2 of 8) Register S8 Default 02 Range 0-255 Units Seconds Description Pause Time for the Comma Dial Modifiers. S8 sets the pause time for the comma dial modifier. The comma is used during dialing when it is necessary to dial through a PBX and wait for a second dial tone. A 2-second delay is usually enough. S8 can be changed or multiple commas can be used to lengthen the delay. Carrier Detect Response Time. S9 sets the carrier detect response time. Lost Carrier to Hang Up Delay. S10 sets the delay time between loss of carrier and hang-up. The modem will not hang-up due to loss of carrier if the value of S10 is 255. DTMF Dialing Speed. S11 sets the duration and inter-digit delay of the touch-tones. Escape Code Guard Time. S12 sets the escape code guard time. Reserved General Bit Mapped Options. S14 is the modem option register with the following bit functions. Bit 0 Reserved Bit 1 Command Echo (See E command) 0 E0-No echo 1 E1--Echo (factory default) Bit 2 Results Code (See Q command) 0 Q0--Enabled (factory default) 1 Q1--Disabled Bit 3 Verbose Command (See V command) 0 V0--Digits 1 V1--Words (factory default) Bit 4 Reserved Bit 5(1) Dial Method (See T and P commands) 0 T--Tone dial 1 P--Pulse dial (factory default) Reserved Originate/Answer (See A, D, and R commands, and register S0) 0 Answer 1 Originate (factory default)
S9 S10
06 14
1-255 1-255
1/10 seconds 1/10 seconds ms 1/50 seconds
--
S11 S12 S13 S14
95 50
--
50-255 0-255
--
AAh
Bit Mapped
None
Bit 6 Bit 7
S15
--
--
--
Reserved
5-4
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
Table 5-2. S Register Description (3 of 8) Register S16 Default 00 Range
--
5.0 S Registers
Units None
Description Modem Test Option. Controls the diagnostic modes as follows: Bit 0 Local Analog Loopback L3 (See &T1 command) 0 Disabled (factory default) 1 &T1--Enabled Bit 1 Reserved Bit 2 Local Digital Loopback (See &T3 command) 0 Disabled (factory default) 1 &T3--Enabled Bit 3 Remote Digital Loopback L2 (See &T6 command) 0 Disabled (factory default) 1 &T6--Enabled
S17
00
0-250
4 ms Fax Mode Null Byte Timer. The value of S17 determines the Increments length of time null bytes are sent by the modem if the last byte sent during DTE underrun in Fax Mode is not a null byte. 0 S17 250 corresponds to a timer value of 0-1 second (i.e., the timer value is the value of S17 times 4 ms). Seconds Test Timer. Sets the length of time the modem conducts a test before returning to the command mode. If this register is zero, the test will not automatically terminate; the test must be terminated from the command mode by issuing an AT&T0 or ATH command. Not Supported Fax Mode Inactivity Timer. S20 can be used to cause the modem to automatically place the telephone on-hook or reset itself if inactivity (of variable duration) is detected while in Fax Mode.
S18
00
0-255
S19 S20
--
--
--
0
1-127
Seconds
D224ATLVDSC
Conexant
5-5
5.0 S Registers
RC224ATL/224ATLV
EmbeddedModem Family
Table 5-2. S Register Description (4 of 8) Register S21 Default 00 Range Bit Mapped Units
--
Description Bit Mapped Options. S21 is the modem register with the following bit functions: Bit 0 Telco Jack (See &J Command) 0 &J0--11/RJ-45S (factory default) 1 &J1--RJ-12/RJ-13 Bit 1 Reserved Bit 2 Ready to Send (RTS)/Clear to Send (CTS). (See &R Command) 0 &R0--CTS tracks RTS (not supported) 1 &R1--RTS is ignored (factory default) Bit 3, 4 Data Terminal Ready (DTR) (See &D Command) 43 00 &D0--Modem ignores DTR (factory default) 01 &D1--Modem goes to command state if ON-to-OFF transition on DTR 10 &D2-Modem "hangs up" if ON-to-OFF transition on DTR 11 &D3--Modem goes to initialization state if ON-to-OFF transition on DTR Bit 5 Data Carrier Detect (DCD) (See &C Command) 0 &C0--DCD is always on (factory default) 1 &C1--An ON condition on DCD indicates the presence of a valid data carrier Bit 6 Data Set Ready (DSR) (See &S Command) 0 &S0--DSR is always on 1 &S1--DSR is turned on at the start of handshaking Bit 7 Long Space Disconnect (See Y Command) 0 &Y0--Disabled (factory default) 1 &Y1--Enabled
5-6
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
Table 5-2. S Register Description (5 of 8) Register S22 Default 76h Range Bit Mapped Units
--
5.0 S Registers
Description Bit Mapped Options. S22 is the modem register with the following bit functions: Bit 0, 1 Speaker Volume (See L Command) 10 00 L0--Speaker volume low 01 L1--Speaker volume low 10 L2--Speaker volume medium (factory default) 11 L3--Speaker volume high Bit 2, 3 Speaker Control (See M Command) 32 00 M0--Speaker disabled 01 M1--Speaker on until carrier detected (factory default) 10 M2--Speaker always on 11 M3--Speaker on until carrier detected but off during dialing Bit 4, 5, 6Result Code Options (See X Command) 654 0 0 0 X0--Selects appropriate connect result code, goes off-hook when the dial command is received, waits the number of nds given by register S6, and "blind dials" (does not look for dial tone). 0 0 1 Reserved 0 1 0 Reserved 0 1 1 Reserved 1 0 0 X1--Selects appropriate connect result code, goes off-hook, waits the number of seconds specified by register S6 and blind dials without waiting for dial tone. Busy is not detected. 1 0 1 X2--Selects appropriate connect result code, goes off-hook, and dials when dial tone is detected. Busy is not detected. 1 1 0 X3--Selects appropriate connect result code, goes off-hook, waits the number of seconds specified in register S6, blind dials, detects busy signal and sends BUSY result code. 1 1 1 X4--Selects appropriate connect result code, goes off-hook and dials when dial tone is detected, detects busy signal and sends BUSY result code. All result codes are enabled (factory default). Bit 7 Make/Break Ratio (See &P Command) 0 &P0--39/61 United States/Canada (factory default) 1 &P1--33/67 UK/Hong Kong
D224ATLVDSC
Conexant
5-7
5.0 S Registers
RC224ATL/224ATLV
EmbeddedModem Family
Table 5-2. S Register Description (6 of 8) Register S23 Default 07 Range Bit Mapped Units
--
Description Bit Mapped Options. Bit 0 Obey request from remote modem for a Remote Digital Loopback (See &T4 and &T5 Commands) 0 &T5 selected--RDL disabled 1 &T4 selected--RDL enabled (factory default) Bit 1, 2 Communications Rate 21 00 300 bps 01 Reserved 10 1200 bps 11 2400 bps (factory default) Bit 3 Reserved Bit 4, 5 Parity Option 54 00 Even parity (factory default) 01 Space parity 10 Odd parity 11 Mark/None parity Bit 6, 7 Guard Tones (See &G Command) 76 00 &G0--Guard tone disabled (factory default) 01 Reserved 10 &G2--1800 Hz guard tone 11 Reserved Sleep Mode Inactivity Timer. S24 is used to set the amount of time the modem may be inactive before it will enter sleep mode. The range of S24 is 0 S24 4, and Sleep Mode is inhibited when S24 = 255. (Also see Sleep Mode Signals in Table 3-5.) Detect DTR Change. If &Q1 is selected, S25 is the delay in seconds after a connection has been made, but before the modem examines the DTR lead.
If in the on-line or on-line command state, changes in DTR that last less than the time specified by S25, in 0.01 sec increments, are ignored by the modem.
S24
00
0-255
Seconds
S25
05
0-255
0.01 or 1 Seconds
S26
01
0-255
0.01 Seconds
RTS to CTS Delay Intervals. Reserved
5-8
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
Table 5-2. S Register Description (7 of 8) Register S27 Default 40h Range Bit Mapped Units
--
5.0 S Registers
Description Bit Mapped Options. Bit 3, 1, 0Communications Mode Option (See &D Command) 310 0 0 0 &Q0 selected--Asynchronous (factory default) 0 0 1 &Q1 selected--Synchronous (not supported) 0 1 0 &Q2 selected--Synchronous (not supported) 0 1 1 &Q3 selected--Synchronous (not supported) 1 0 0 Reserved 1 0 1 Reserved 1 1 0 Reserved 1 1 1 Reserved Bit 2 Dial Up/Leased Line Option 0 Dial Up (factory default) 1 Leased Line (not supported) Bit 4, 5 Synchronous Transmit Clock Source Selection (See &X Command) 54 00 &X0--Internal Clock (factory default) 01 &X1--External DTE Clock (not supported) 10 &X2--Receive Clock (not supported) 11 Reserved Bit 6 Communications Standard Option (See B Command) 0 B0--CCITT V.22 bis/V.22 1 B1--Bell 212A (factory default) Bit 7 Data/Fax Discrimination (i.e., AT+FAA Status) 0 Data/Fax auto answer mode disabled (AT+FAA = 0) 1 Data/Fax auto answer mode enabled (AT+FAA = 1)
D224ATLVDSC
Conexant
5-9
5.0 S Registers
RC224ATL/224ATLV
EmbeddedModem Family
Table 5-2. S Register Description (8 of 8) Register S28 Default 00 Range Bit Mapped Units
--
Description Bit Mapped Options. Bit 2, 1, 0Transmit Level Attenuation (See %Ln Command) 2 1 0 Description 0 0 0 0 dB attenuation 0 0 1 2 dB attenuation 0 1 0 4 dB attenuation 0 1 1 6 dB attenuation 1 0 0 8 dB attenuation 1 0 1 10 dB attenuation 1 1 0 12 dB attenuation 1 1 1 14 dB attenuation Bit 5, 4, 3DTMF Transmit Level Attenuation (See %Dn Command) 5 4 3 Description 0 0 0 0 dB attenuation 0 0 1 2 dB attenuation 0 1 0 4 dB attenuation 0 1 1 6 dB attenuation 1 0 0 8 dB attenuation 1 0 1 10 dB attenuation 1 1 0 12 dB attenuation 1 1 1 14 dB attenuation Bit 6 Dialing Pulses per Second 0 10 pps 1 20 pps Bit 7 Secondary Defaults (See %J Command) 0 &F defaults 1 %J defaults
NOTE(S):
(1)
Bit 5 is set or reset if the dial command string contains a P (pulse dial) or T (tone dial), respectively. If a subsequent dial command string is used with a P or T, the modem uses the option specified by this bit.
5-10
Conexant
D224ATLVDSC
6
6.0 Operation
Modem operation supports data modem processing, fax modem processing and common call progress processing. The AT+FCLASS command allows the operator to select either data or fax operation. AT+FCLASS=0 Data mode AT+FCLASS=1 Fax mode Class 1
6.1 Data Modes
6.1.1 Data Mode Selection
Data mode operation is defined by the AT commands and S register settings described in Chapter 4 and Chapter 5. Data rate selection is determined by the speed of the originating and answering modems as listed in Table 6-1.
Table 6-1. Data Rate Selection Originate Mode Answer Mode 300
300 1200 2400 300 300 300
1200
1200 1200 1200
2400
1200 1200 2400
6.1.2 Data Modem Processing
Data modem processing is explicitly defined in CCITT V bis, CCITT V .22 .22, Bell 212A, and Bell 103 documentation. All modulation, waveform spectrum, and data processing functions conform to the appropriate specifications with the following exceptions:
1. 2. 3. 4.
CTS is ON all the time and does not go OFF during handshake. DSR is always ON in parallel mode operation. The rate change request option is not supported for V bis. .22 V operation supports only Alternative B, mode ii (1200 bps .22 asynchronous, 10 bit characters)
D224ATLVDSC
Conexant
6-1
6.0 Operation
6.1 Data Modes
RC224ATL/224ATLV
EmbeddedModem Family
6.1.3 Call Origination
Automatic and manual origination of calls is supported. Automatic call origination is supported by the ATDS command. The modem automatically enters the data handshaking mode upon completion of the dial function.
6.1.4 Call Answering
Automatic and manual answering of calls is supported. Incoming ring signals are detected by the modem and indicated by the RING result code. Answering can be performed by the DTE acknowledging the RING result code and issuing the ATA command or by having the modem automatically go off-hook after N rings are detected. The number of rings, N, is determined by the setting of the S0 register. Upon going off-hook, the DCE will transmit 2100 Hz (or 2225 Hz for Bell modes) for a duration of not less than 2.6 seconds and not more than 4.0 seconds.
6.1.5 Call Termination
A call is terminated by the DTE sending the ATH command to the modem.
6-2
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
6.0 Operation
6.2 Fax Modes
6.2 Fax Modes
6.2.1 Fax Mode Selection
Fax modes and rates are determined by the AT+F commands and are defined in Chapter 4.0, AT Commands.
6.2.2 Fax Mode Processing
Fax modem processing is explicitly defined in CCITT V .29, CCITT V ter, and .27 CCITT V recommendations. All modulation, waveform spectrum, and data .21 processing functions conform to the appropriate specifications with the following exceptions:
1. 2. 3. 4. 5. 6.
V receive functions are not supported. .29 V 4800 bps is not supported; V ter 4800 bps is used instead. .29 .27 V half-duplex continuous carrier mode only is supported. .29 V channel multiplexer option is not supported. .29 V ter 75-baud backward channel option is not supported. .27 V ter short train mode is not supported. .27
6.2.3 Fax Origination
Automatic origination of fax call is supported by the ATDS command. Upon completion of the dial function, a calling tone at 1100 Hz ( 38 Hz) with an ON duration of 0.5 seconds ( 75 ms) and OFF duration of 3 seconds ( 450 ms) is transmitted.
6.2.4 Fax Answering
Answering of fax calls is identical to answering of data calls, with the exception that the DCE enters the fax handshaking mode instead of the data handshaking mode after going off-hook.
D224ATLVDSC
Conexant
6-3
6.0 Operation
6.2 Fax Modes
RC224ATL/224ATLV
EmbeddedModem Family
6.2.5 Fax Data Transmission
Fax data transmission is initiated by the +FTM command. Upon recognition of the command, the modem initiates the selected modulation mode and issues the CONNECT result code. The proper training sequence for the selected mode is transmitted, followed by constant 1 bits, until data is received from the DTE. DTE data is buffered and processed prior to being transmitted. The transmission is terminated when the transmit buffer becomes empty and the last transmitted character was not a NUL character. The modem then turns off the carrier and issues the OK result code. If the last character was a NUL character (00), the modem continues to transmit NUL characters until more data is received by the DTE or until 5 seconds have elapsed. After 5 seconds, the modem turns off the carrier and issues the ERROR result code.
6.2.6 Fax Data Reception
Fax data reception is initiated by the +FRM command. Upon recognition of the command, the modem initiates the selected demodulation mode and looks for the proper carrier. When the selected carrier is detected, the modem issues the CONNECT result code +FCERROR. If a signal other than the selected carrier is detected, the modem returns to the command state. Demodulated data is stored in an output buffer for additional I/O processing and eventual output to the DTE. Detection of loss of carrier will cause the modem to issue the NO CARRIER result code and will cause the modem to return to the command state. Any character other than flow control characters issued while the receiver is outputting data will cause the receiver to abort and return to the command state.
6.2.7 Fax Control Transmission
Fax control transmission is initiated by the +FTH command or after answering a call. The modem initiates the selected modulation mode, issues the CONNECT result code, transmits one second of flags, then transmits data sent by the DTE. DTE data is buffered and processed prior to transmission. Processed I/O data is grouped into frames and encoded with a CRC generator. The generator polynomial is X16 + X12 + X5 + 1. The CRC parity or frame check sequence (FCS) is appended to the end of the frame. The end of the frame is indicated by an empty I/O buffer. Transmission frames begin and end with a flag sequence (7Eh). The ending flag may serve as the beginning flag for the next frame. To prevent data from looking like flags, a 0 is inserted into the data stream after five consecutive 1s are detected.
6-4
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
6.0 Operation
6.2 Fax Modes
Each frame is checked to see if the current frame is the last frame of the transmission. If the final frame bit (5th received bit of the second byte of the frame) is 1, indicating that the current frame is the final frame, the modem completes the frame transmission, issues the OK result code, and returns to the command state. If the final frame bit is a 0, the modem issues the CONNECT result code and continues to transmit flags until one of the following actions is taken by the DTE: If additional data is sent by the DTE, the modem transmits another frame. If the transmission is terminated by the string, the modem turns off the carrier and issues the OK result code. 3. If no data is sent by the DTE within 5 seconds of receiving the CONNECT message, the modem turns off the carrier and issues the ERROR result code.
1. 2.
6.2.8 Fax Control Reception
Fax control reception is initiated by the +FRH command or after dialing. Upon recognition of the command, the modem initiates the selected demodulation mode and looks for the proper carrier. When the selected carrier is detected, the modem issues the CONNECT result code. If a signal other than the selected carrier is detected, the modem issues an +FCERROR result code and returns to the command state. The modem removes the flags, removes transmitter inserted 0 bits (a 0 following five consecutive 1s), performs the CRC error checking, and stores the data in the internal I/O buffer for further processing and eventual passing to the DTE. The modem indicates the end of a frame by issuing the characters and an OK result code if the frame was received correctly, or by issuing an ERROR result code if one or more errors were detected in the frame. The first frame received is stripped of flags (CONNECT result code indicates that a valid flag has been received) and output to the DTE. Subsequent frames are buffered and output to the DTE when additional +FRH commands are received. Any characters other than flow control that are received while demodulating data and prior to issuance of the status result code will result in the receive process being aborted, an OK result code being issued, and the modem returning to the command state. After the status result code is issued, the modem continues to demodulate data. Additional +FRH commands specifying the same modulation rate will result in the issuance of a CONNECT result code, output of the next data frame, and continuation of normal demodulation. Any other commands will result in the receive process being aborted, buffered data being discarded, and the command being implemented. Detection of loss of carrier will result in the modem issuing the NO CARRIER result code and returning to the command state.
6.2.9 Fax I/O Processing
The fax I/O interface supports asynchronous serial and parallel interfaces. The interface rate is 19.2 kbps. Start and stop elements are removed from the incoming serial data stream and are added to the outgoing serial data (receive).
D224ATLVDSC
Conexant
6-5
6.0 Operation
6.2 Fax Modes
RC224ATL/224ATLV
EmbeddedModem Family
Both transmit and receive data are buffered. Flow control using X-on/X-off (DC1/DC3) is provided. Unique control character strings are identified, filtered, or reinserted into the I/O data stream. These control characters and their resultant action are shown below.
DTE to Modem Transmit Data Stream
Delete characters.
Recognize as a string terminator and take appropriate action.
Replace with single character.
Modem to DTE Receive Data Stream
Insert extra ahead of
The modem also identifies the end of a frame by inserting into the data stream after the FCS bytes.
6-6
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
6.0 Operation
6.3 Fax Enhanced Flow Control
6.3 Fax Enhanced Flow Control
The fax Class 1 standard provides for bidirectional X-on/X-off flow control. However, in multitasking "windowing" environments, the DTE communication package can be suspended long enough to miss a 19,200 bps serial asynchronous character sent by the DCE (520.83 s). X-on/X-off flow control will not solve this problem because the DTE software does not always know when it is going to be suspended. To solve this problem, a new enhanced flow control mechanism is provided. This mechanism is enabled/disabled by issuing an AT+FF=1/0 command.
6.3.1 Parallel/Serial Interface Selection
For parallel host interface operation, the enhanced flow control takes advantage of the fact that the DCE hardware knows if the DTE has read the last character. The DCE will not send a new character until the DTE reads the previous one. The modem fax receiver has an internal 223-byte buffer. Therefore, the DTE can stop reading characters for 371 ms (4800 bps receive) before any data is lost. For serial interface operation, the enhanced flow control mechanism utilizes the fact that the Fax Class 1 serial interface is only required to operate half duplex. The scheme involves sending characters to the DTE and waiting for the DTE to send an acknowledgment (if the DTE reads the character OK) or a request for re-transmission (if the DTE misses a character and detects an overrun). The required DTE operation using the enhanced flow control mechanism is defined below.
6.3.2 Fax V.42 Buffer Sizes
Fax V buffer sizes are shown below. .42
Buffer Type Fax V.27/V.29 Tx Fax V.21 (HDLC) Tx RPI (HDLC) Tx Fax V.27 Rx Fax V.21 (HDLC) Rx Size in Bytes 255 (9600:212 ms) 255 (300:6.8 sec) 238 (2400:793 ms) 223 (4800:371 ms) 255 (300:6.8 sec)
D224ATLVDSC
Conexant
6-7
6.0 Operation
6.4 Data/Fax Auto Answering
RC224ATL/224ATLV
EmbeddedModem Family
6.3.3 DTE Flow Control Operation
Normal operation: DTE does not miss character. The DTE reads the serial character sent by the DCE. The DTE checks serial hardware overrun status and determines that an overrun did not occur. The DTE can therefore use the character. The DTE must send the following acknowledgment character back to the DTE.
11111110 (FEh)
Overrun Operation:
DTE misses character. The DTE returns after being suspended and reads the serial character sent by the DCE. The DTE checks serial hardware overrun status and determines that an overrun occurred. The DTE does not use the received character. The DTE then sends the following re-transmission request character back to the DCE.
11110000 (F0h)
6.4 Data/Fax Auto Answering
Data/fax auto answering, when used with appropriate DTE host software, will automatically recognize whether an incoming call is a data or fax modem. This mechanism can be used with an integrated data/fax communication package or with separate data/fax communication packages operating together in a foreground/background configuration. The auto answering mechanism is structured such that the DTE is initially operating in the fax mode. The DTE enables auto answering using the AT+FAA=1 command (saved in NVRAM under S27). This command should be issued while AT+FCLASS=1. The DTE will then change its communication rate from 19,200 bps (fax class 1 rate) to the rate expected in data mode (2400, 1200, or 300 bps). The DCE will attempt to establish a connection with the incoming call as a data modem. If the incoming call is a fax, the DCE will switch to the fax mode and establish the connection. To minimize incompatibilities with various fax and data modems, the 59 register is used to define the length of time that the DCE has to establish a data connection.
S9 (Range: 0-255; Default: 06) defines the time (in seconds) after going off-hook that the DCE waits for the entire data mode handshaking process to complete before switching to fax mode.
When a call is received (DCE sends RING result code), the DTE can initiate the answer manually by sending an ATA command. Alternatively, the DTE can allow the DCE to answer automatically by setting S0=non-zero value. After the DCE goes off-hook, it will automatically determine the caller type (data or fax),
6-8
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
6.0 Operation
6.4 Data/Fax Auto Answering
establish the appropriate connection, and inform the DTE of the caller type with the following result codes:
Numeric
13 (0Dh)
Verbose
DATA
Description DCE sends this result code only during auto answering or when DCE has connected as a data modem. DCE sends this result code only during auto answer mode when DCE has connected as a fax modem.
15 (0Fh)
FAX
It is assumed initially for auto answer operation that the DTE is running the fax communication package. It is impractical to force the fax package to use the same options selected by the data package. Therefore, some method must be provided to allow the DTE fax package to restore the DCEs registers after the DCE has connected as a data modem. The DCE accommodates this by automatically entering the on-line command mode after connecting. After the DTE receives the DATA result code, it can then send any necessary AT commands to the DCE. The DCE will wait in the on-line command mode and delay sending the "data" connect message until the DTE sends an ATO command. After sending the ATO command, the DTE then transfers control to the data communication package. For DTEs running separate data and fax packages in a foreground/background configuration, a method is provided to allow the fax package to regain control after the data connection has terminated during auto answer mode without requiring changes to existing data packages. The RC224ATLV accommodates this through the use of the data carrier detect (DCD) indicator. Initially, in auto answer mode DCD will be off. When connected in data mode, the DCE will turn DCD on. When the data connection is terminated, the DCE will turn DCD off again. The fax package, running in the background, can poll DCD (160450 modem status register bit 7) to ascertain the data connection status. The DTE must send AT&C1 to cause DCD to operate in this manner. During auto answer mode, when the caller is a fax machine, the DCE will behave as a normal fax DCE (as defined by +FCLASS=1) with the following exceptions: The transmission of the fax 2100 Hz answer tone will be delayed by the time needed to determine that the caller is a fax machine (S9 seconds). 2. The DCE sends FAX message at the data mode DTE rate (as defined by the previous AT command autobaud rate) and automatically sets +FCLASS=1 after detecting that the caller is a fax. 3. After the answer tone is sent and the DCE enters the V .21 transmit mode, the CONNECT result code will be sent at 19,200.
1.
During auto answer mode, if the DCE determines that the caller is not a data modem nor a fax machine, then DCE will send the NO CARRIER result code, go on-hook and remain in data mode. Table 6-2 describes a procedure to configure a terminal being called by a 1200 bps data modem. Table 6-3 describes a procedure to configure a terminal being called by a fax machine with or without calling tone.
D224ATLVDSC
Conexant
6-9
6.0 Operation
6.4 Data/Fax Auto Answering
RC224ATL/224ATLV
EmbeddedModem Family
Table 6-2. Terminal Called by a 1200 bps Data Modem DTE Command
--
DCE Response
--
Comments Assume DCE in fax mode (FCLASS = 1), DTE running fax communication package, and DCD is off. DTE commands DCD to follow data carrier. DTE defines the data mode connection time. DTE enables data/fax auto answer mode.
AT&C1 ATS9=n AT+FAA=1 --
OK OK OK --
DTE sets the communication rate to the data modem rate (e.g., 2400 bps) prior to an incoming call. Terminal is being called.
-- ATA --
RING -- --
DTE commands DCE to go off-hook and start auto answer. DCE determines caller as data modem and establishes connection with caller. DCE turns on DCD to indicate data connection is established. DCE then waits in on-line command mode. DCE indicates data modem connection is established. DTE optionally sends any commands to DCE to restore conditions required by data modem communications package. DTE instructs DCE to switch from on-line command to data state. DTE then transfers control to data modem package. Fax package remains in background polling DCD to check connection status. DCE response will then be read by data modem communication rate to 1200 bps. DTE sends/receives data. Caller hangs up. DTE detects carrier loss and turns off DCD. DCE indicates connection with caller has terminated. DTE fax communications software, running in background, sees DCD turn off, and regains control from data modem package.
-- -- -- AT commands DATA OK
-- --
ATO -- --
CONNECT 1200 -- --
--
--
-- -- -- --
"Callers data" -- NO CARRIER --
6-10
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
Table 6-3. Terminal Called by a Fax Machine DTE Command
--
6.0 Operation
6.4 Data/Fax Auto Answering
DCE Response
--
Comments Assume DCE in fax mode (FCLASS = 1), DTE is running fax communication package, and DCD is off. DTE commands DCD to follow data carrier. DTE defines the data mode connection time. DTE enables data/fax auto answer mode.
AT&C1 ATS9=n AT+FAA=1 --
OK OK OK --
DTE sets the communication rate to the data modem rate (e.g., 2400 bps) prior to an incoming call. Terminal is being called.
-- ATA --
RING -- --
DTE commands DCE to go off-hook and start auto answer. DCE starts data modem handshaking. If receive data signal is not detected within S9 seconds from going off-hook, DCE switches to fax mode and automatically sets FCLASS=1. DCE switches to fax mode handshaking and sends "FAX" message at the data modem rate (e.g., 2400 bps).
--
FAX
--
--
DCE sends 3 seconds of 2100 Hz answer tone, enters V.21 transmit mode, and sends HDLC flags. DCE ends CONNECT response at the fax rate (i.e., 19,200 bps).
--
CONNECT
D224ATLVDSC
Conexant
6-11
6.0 Operation
6.5 Call Progress
RC224ATL/224ATLV
EmbeddedModem Family
6.5 Call Progress
6.5.1 Call Progress Algorithms
Data call progress algorithms measure the power and/or relative power of the highband and lowband channels and determine signal presence and cadence correlations. Highband channel signals include 2100 and 2225 Hz signalling tones. Lowband channel signals include dial tones, busy tones, ringback tones and voice ranging in frequency from 120 to 620 Hz. Characteristics of the tones detected by the RC224ATLV are listed in Table 6-4.
Table 6-4. Tone Characteristics Tone
Dial Tone Old Dial Tone Busy Old Busy Precision Reorder Old Reorder (local) Old Reorder (toll) Ringback Old Ringback Double Ringback
Cadence
Continuous Continuous 0.5 sec ON 0.5 sec OFF 0.5 sec ON 0.5 sec OFF 0.3 sec ON 0.2 sec OFF 0.25 sec ON 0.25 sec OFF 0.2 sec ON 0.3 sec OFF 0.8-1.2 sec ON 2.7-3.3 OFF 2 sec ON 4 sec OFF 0.8 sec ON 0.3 sec OFF 0.8 sec ON 4 sec OFF
Frequency (Hz)
350 + 440 600+120/133 480 + 620 480 + 620 600 + 120 600 + 120 480 + 620 480 + 620 600 + 120 600 + 120 600 + 120 600 + 120 440 + 480 440 + 480 420 + 40 420 + 40 440 + 480 440 + 480 440 + 480 440 + 480
Fax answer tone detection requirements include 2100 and 1100 Hz. The call progress detection requirements are identical to the lowband data signals identified above.
6-12
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
6.0 Operation
6.5 Call Progress
6.5.2 Ring Detection
Ring detection is based on a digital input to the modem. External circuitry not part of the modem is required to convert the analog 40 to 150 VRMS ring signal to a digital single-bit data stream representation. Valid ring frequencies of 15.3 to 68 Hz are detected. Detection is achieved by counting valid high to low ring signal transitions. Valid transitions consist of a high state of 2 to 34 ms followed by a low state of 2 to 42 ms. Ring signals that have transition counts less than the nominal value are discarded. In addition to valid high to low transitions, ring detection depends on the cadence of the ring ON time (valid transitions occurring) and ring OFF time (no valid transitions). Ring OFF times must be greater than 0.5 seconds. Ring ON times must be greater than 125 ms at 20 Hz (100 ms at 68 Hz). Ring detection is integrated over 8 seconds. All counters and timers are reset at 8 second intervals. The modem will answer the ring after N valid ON/OFF ring cycles. N is programmable via the S0 register. Upon detecting N rings, the modem verifies that the current ring state has been in the OFF state for 0.5 seconds before seizing the line. Table 6-5 lists the Fax Class 1 calling sequence; Table 6-6 lists the answering sequence.
Table 6-5. Fax Class 1 Calling Sequence (1 of 2) DTE Commands (Host)
(1) AT+FCLASS=1
DCE Responses (Modem)
(2) OK
Remote Fax
-- PHASE A Set to Class 1
Notes
(3) ATDT6163
(4) Dials (6) CONNECT
(5) Answers (7) Send HDLC flags PHASE B
+FRH=3 implied by Dialing
-- -- (10) AT+FRH=3 -- -- (14) AT+FRH=3 -- -- (19) AT+FTH=3 -- (22) -- (26) --
-- (9) , OK (11) CONNECT -- (13) , OK (15) CONNECT -- (17) , OK (20) Send HDLC flags (21) CONNECT (23) Send TSI frame (25) CONNECT (27) Send DCS frame (29) Detect last frame bit
(8) Send NSF frame -- -- (12) Send CSI frame -- -- (16) Send DIS frame (18) Drop carrier (21) Receive flags -- (24) Receive TSI -- (28) Received DCS -- Last frame bit = 1 Last frame bit = 0 Last frame bit = 1
-- -- -- -- -- --
-- -- --
--
--
D224ATLVDSC
Conexant
6-13
6.0 Operation
6.5 Call Progress
RC224ATL/224ATLV
EmbeddedModem Family
Table 6-5. Fax Class 1 Calling Sequence (2 of 2) DTE Commands (Host)
-- (31) AT+FTS=8 (33) AT+FTM=96 -- (36) -- (40) AT+FRH=3 -- -- --
DCE Responses (Modem)
(30) OK, drop carrier (32) OK, wait 80 ms (34) Send F.29 (35) CONNECT (37) Send TCF data (39) OK (41) CONNECT -- (43) , OK (45) OK
Remote Fax
-- -- -- -- (38) Receive and check -- -- (42) Send CFR frame (44) Drop carrier -- PHASE C Last frame bit = 1
Notes
-- -- -- -- -- -- --
-- --
(46) AT+FRM=06 -- (49) Page data -- (53) AT+FTH=3 --
(47) Send V.29 (48) CONNECT (50) Send page data (52) OK (54) Send HDLC flags (56) CONNECT
-- -- (51) Receive data -- (55) Receive flags -- PHASE D
-- -- -- -- -- --
(57) -- (61) AT+FRH=3 -- -- (65) AT+FTH=3 -- (69) --
(58) Send EOP frame (60) OK, drop carrier (62) CONNECT -- (64) ,OK (66) Send HDLC flags (68) CONNECT (70) Send DCN frame (72) OK, drop carrier
(59) Receive EOP -- -- (63) Send MCF frame -- (67) Receive flags -- (71) Receive DCN -- PHASE E
Last frame bit = 1 -- -- Last frame bit = 1 -- -- -- Last frame bit = 1 --
(73) ATH0
(74) OK, hang up
(75) Hang up
--
6-14
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
6.0 Operation
6.5 Call Progress
Table 6-6. Fax Class 1 Answering Sequence (1 of 2) DTE Commands (Host)
(1) AT+FCLASS=1 (2b) AT+FRM=? --
DCE Responses (Modem)
(2) OK 24,48 OK
Remote Fax
-- -- -- PHASE A Set to Class 1
Notes
-- --
-- -- (5) ATA -- -- (4) RING
--
(3) FAX machine dials -- -- (8) Receive flags -- PHASE B
-- -- -- +FTH=3 implied by answering --
(6) Modem answers (7) Send HDLC flags (9) CONNECT
(10) -- (14) -- (18) -- (22) AT + FRH=3 -- -- (26) AT+FRH=3 -- -- (31) AT+FTH=3 -- -- -- -- (38) AT+FRM=48 (40) --
(11) Send NSF frame (13) CONNECT (15) Send CSI frame (17) CONNECT (19) Send DSI frame (21) OK, drop carrier (23) CONNECT -- (25) ,OK (27) CONNECT -- (29) ,OK -- -- (33) CONNECT (35) (37) NO CARRIER (39) CONNECT (41) Send CFR frame (43) OK, drop carrier
(12) Receive NSF -- (16) Receive CSI -- (20) Receive DSI -- -- (24) Send TSI frame -- -- (28) Send DCS frame (30) Drop carrier -- (32) Send V.27 (4800) (34) Send TCF frame (36) Drop carrier -- -- (42) Receive CFR --
Last frame bit = 0 -- Last frame bit = 0 -- Last frame bit = 1 -- -- Last frame bit = 0 -- -- Last frame bit = 1 -- -- -- -- -- -- -- Last frame bit = 1 --
D224ATLVDSC
Conexant
6-15
6.0 Operation
6.5 Call Progress
RC224ATL/224ATLV
EmbeddedModem Family
Table 6-6. Fax Class 1 Answering Sequence (2 of 2) DTE Commands (Host) DCE Responses (Modem) Remote Fax
PHASE C (44) AT+FRM-48 -- -- -- -- -- (46) (48) NO CARRIER -- (45) Send page data (47) Drop carrier -- PHASE D (49) AT+FRH=3 -- -- (53) AT+FTH=3 (55) -- (59) AT+FRH=3 -- -- (50) CONNECT -- (52) , OK (54) CONNECT (56) Send MCF frame (58) OK, drop carrier (60) CONNECT -- (62) , OK -- (51) Send EOP frame -- -- (57) Receive MCF -- -- (61) Send DCN frame -- PHASE E (73) ATH0 (74) OK, hang up (75) Hang up -- Last frame bit = 1 -- Last frame bit = 1 -- -- Last frame bit = 1 -- -- -- -- -- -- --
Notes
6-16
Conexant
D224ATLVDSC
7
7.0 Electrical/Mechanical Specifications
7.1 Interfacing the RC224ATLV
The RC224ATLV is not 5.0 V I/O logic tolerant. It is recommended that a series resistor of 150 be added to current limit the digital inputs to the RC224ATLV when interfacing to + 5.0 V logic output lines. The digital outputs of the RC224ATLV should not go to resistor pullups that are connected to the + 5 V power supply. These precautions will help prevent the modem chip from going into latchup due to raising any input or output pin level more than + 0.3 V above the + 3.3 V power rail of the RC224ATLV .
7.2 Environmental Requirements
The environmental specifications are listed in Table 7-1.
Table 7-1. Environmental Specifications Parameter
Operating Temperature Storage Temperature Relative Humidity
Specification
0 C to + 70 C (32 F to 158 F) - 55 C to + 125 C (- 67 F to + 257 F) Up to 90 % noncondensing, or a wet bulb temperature up to 35 C, whichever is less.
D224ATLVDSC
Conexant
7-1
7.0 Electrical/Mechanical Specifications
7.3 Interface Timing and Waveforms
RC224ATL/224ATLV
EmbeddedModem Family
7.3 Interface Timing and Waveforms
Table 7-2 lists the host bus interface timing parameters. Figure 7-1 illustrates the interface waveforms. Table 7-3 lists the current and power requirements, and Table 7-4 lists absolute maximum ratings.
Table 7-2. Timing-Host Bus Interface Symbol
tAS tAH tCS tCH tRD tDD tDRH tWT tDS tDWH tDF tDIS tDIH tINH
Parameter
Address Setup Address Hold Chip Select Setup Chip Select Hold Read Strobe Width Delay HRD to Data HRD to Data Hold Write Strobe Width Write Data Setup Write Data Hold HRD to Driver Off HDIS Enable HDIS Hold Interrupt Hold
Min
25 0 10 0 100 -- 10 75 30 10 -- -- 40 --
Max
-- -- -- -- -- 75 -- -- -- -- 30 40 -- 100
Units
ns ns ns ns ns ns ns ns ns ns ns ns ns ns
7-2
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
Figure 7-1. Timing Waveform
7.0 Electrical/Mechanical Specifications
7.3 Interface Timing and Waveforms
HA0-HA2
tAS tAH
HCS
tCS tCH
HRD
tRD
HWT
tDF
HD0-HD7
tDD tDIS tDRH tDIH
HDIS
a. Host Read
HA0-HA2
tAS tAH
HCS
tCS tCH
HRD
tWT
HWT
tDS
HD0-HD7
tDWH
HDIS
b. Host Write
D224ATLVDSC
Conexant
7-3
7.0 Electrical/Mechanical Specifications
7.3 Interface Timing and Waveforms
RC224ATL/224ATLV
EmbeddedModem Family
Table 7-3. Current and Power Requirements Current (ID) Mode Typical Current @ 25C
20 mA 5 mA 1 mA
Power (PD) Typical Power @ 25C
100 mW 25 mW 5 mW
Maximum Current @ 0C
22 mA 6 mA 1 mA
Maximum Power @ 0C
110 mW 30 mW 5 mW
Operating Sleep - Idle Sleep - Stop
NOTE(S):
1. Test conditions: VDD = 5.0 VDC for typical values; VDD = 5.25 VDC for maximum values. 2. Test conditions: VDD = 3.3 VDC for typical values; VDD = 3.6 VDC for maximum values.
Table 7-4. Absolute Maximum Ratings Parameter
Supply Voltage Input Voltage Analog Inputs Voltage Applied to Outputs in High Z State DC Input Clamp Current DC Output Clamp Current Static Discharge Voltage (@ 25C) Latch-Up Current (@ 25C) Operating Temperature Range Storage Temperature Range
Symbol
VDD VIN VIN VHZ IIK IOK VESD ITRIG TA TSTG
Limits
- 0.5 to + 7.0 - 0.5 to VCC + 0.5 - 0.3 to + 5 VAA + 0.3 - 0.5 to + 5 VDD + 0.5 20 20 3000 200 - 0 to + 70 - 40 to + 80
Units
V V V V mA mA V mA C C
NOTE(S): Stresses above those listed may cause permanent damage to the device. This is a stress rating only, and functional
operation at these or any other conditions above those listed in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
7-4
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
7.0 Electrical/Mechanical Specifications
7.3 Interface Timing and Waveforms
Table 7-5 lists digital interface characteristics, and Table 7-6 lists analog interface characteristics.
Table 7-5. Digital Interface Characteristics Parameter
Input High Voltage Type IA Type DIO Type IH Input Low Voltage Type IA, IC, and DO Input Low Voltage Type IF Input Leakage Current IA and IC Output High Voltage Type OA Type OD Type OG Type OH Output Low Voltage Type OA Type OB Type OD Type OG Type OH Three-State (off) Current
NOTE(S):
(1)
Symbol
VIH
Min.
2.0 2.4 - 30
Typ.
-- -- --
Max
VCC VCC 30
Units
VDC
Test Conditions(1)
--
VIL - 0.3 VIL 38 IIN -- VOH 2.4 -- -- 5 VOL -- -- -- 0.5 -8 ITS -- -- -- 0.75 -- -5 -- 0.4 0.4 -- -- -- 25 -- -- -- 8 -- VCC VCC -- -- 10 -- -- -- 0.8
VDC VRMS
(2)
--
Adc VDC
VIN = 0 to VCC
ILOAD = -100 A ILOAD = 0 mA
VDC ILOAD = 1.6 mA ILOAD = 0.8 mA ILOAD = 15 mA ILOAD = 8 mA Adc VIN = 0.8 V to 4.5 V
RC224ATL Test Conditions: VCC = 5 V 5%, TA = 0C to 70C (unless otherwise stated). RC224ATLV Test Conditions: VCC = 3.3 V 5%, TA = 0C to 70C (unless otherwise stated). Output loads: 50 pF + one TTL. (2) AC V RMS voltage between Tip and Ring, using the on-board modular DAA.
D224ATLVDSC
Conexant
7-5
7.0 Electrical/Mechanical Specifications
7.3 Interface Timing and Waveforms
RC224ATL/224ATLV
EmbeddedModem Family
Table 7-6. Analog Interface Characteristics Name
RXA -- TXA1, TXA2 -- -- -- -- SPKR -- -- -- --
NOTE(S):
(1)
Type
I (DA) -- O (DD) -- -- -- -- O (DF) -- -- -- --
Characteristic
Input impedance Voltage range Minimum load Maximum capacitive load Output impedance Output voltage DC offset Minimum load Maximum capacitive load Output impedance Output voltage DC offset
Value
>50 k 2.5 1.6 V 300 0.01 F 10 2.5 1.6 V <200 mV(1) 300 0.01 F 10 2.5 1.6 V <20 mV(1)
With Reference to VC (2.5 V nominal).
Figure 7-2 shows the mechanical drawing of the 68-pin PLCC. Table 7-7 lists its dimensions. Figure 7-3 shows the mechanical drawing of the 100-pin PQFP. Table 7-8 lists its dimensions.
7-6
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
Figure 7-2. 68-Pin PLCC
D D1 INDEX CORNER D2
7.0 Electrical/Mechanical Specifications
7.3 Interface Timing and Waveforms
SEATING PLANE
D D1 D2
TOP VIEW CHAM. J x 45 DEG.
TOP VIEW
D D1 D3 R1
A
A
A1 A2 A
CHAM. h x 45 DEG. 3 PLCS
e
b
TYP. FOR EACH AXIS (EXCEPT FOR BEVELED EDGE) SECTION A-A
R
BOTTOM VIEW
D224ATLVDSC
Conexant
7-7
7.0 Electrical/Mechanical Specifications
7.3 Interface Timing and Waveforms
RC224ATL/224ATLV
EmbeddedModem Family
Table 7-7. 68-Pin PLCC Dimensions Millimeters Dim Min
A A1 A2 b D D1 D2 D3 e h J R R1 25.02 24.00 20.19 23.24 1.27 BSC 0.254 TYP 1.15 TYP 45 TYP 0.89 TYP 0.254 TYP 4.14 1.37 2.31 0.457 TYP 25.27 24.26 20.45 23.5 0.985 0.945 0.795 0.915 0.050 BSC 0.010 TYP 0.045 TYP 45 TYP 0.035 TYP 0.010 TYP
Inches Max
4.39 1.47 2.46
Min
0.163 0.054 0.091 0.018 TYP
Max
0.173 0.058 0.097
0.995 0.955 0.805 0.925
NOTE(S): Reference: PD68J/GP00-D164
7-8
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
7.0 Electrical/Mechanical Specifications
7.3 Interface Timing and Waveforms
Figure 7-3. 100-Pin PQFP
D CHAM. H x 45 DEG. (4x) D1 See Detail A
D
D1
E1
PIN 1 REF
a
b
TOP VIEW
SIDE VIEW
R1 R2 A A1 J
A2
K2 K1 K3 DETAIL A
D224ATLVDSC
Conexant
7-9
7.0 Electrical/Mechanical Specifications
7.3 Interface Timing and Waveforms
RC224ATL/224ATLV
EmbeddedModem Family
Table 7-8. 100-Pin PQFP Dimensions Millimeters Dim Min
A A1 A2 D D1 E E1 K1 K2 K3 R1 R2 a b H J 0.13 0.15 0.60 0.26 -- 0.13 1.95 0.95 0.15 22.96 19.89 16.94 13.89 0.70 0.40 1.60 REF -- 0.25 0.70 0.36 0.25 0.17 0.005 0.008 0.024 0.010 -- 0.005
Inches Max
2.05 1.05 0.25 23.44 20.09 17.45 14.10 0.90 --
Min
0.077 0.037 0.006 0.904 0.783 0.667 0.547 0.028 0.016 0.083 REF
Max
0.081 0.041 0.010 0.923 0.791 0.687 0.555 0.035 --
-- 0.010 0.028 0.014 0.010 0.007
NOTE(S): Reference: GP00-D234
7-10
Conexant
D224ATLVDSC
A
Appendix A: RC224ATF Modem Designs
This appendix describes two modem design examples. The schematics and parts lists are provided for designs incorporating the RC224ATF packaged in a 68-pin PLCC and implemented with either a parallel or serial interface.
A.1 68-Pin PLCC Design for Serial Interface
Figure A-1 and Figure A-2 provide the schematic of a RC224ATF 68-pin PLCC serial interface board design. Table A-1 lists the bill of materials for this design.
D224ATLVDSC
Conexant
A-1
2
1
6 1
4
8
A-2
VCC R12 100 Y1 3 1 6 .000312MHZ C22 .1 U7 C9 12 10% 20V DECOUPLING CAPS VCC L1 47 C14 .1 C15 .1 C21 .1 VCC
C7 56 pF 5%
C17 56 pF 5%
Figure A-1. Serial Interface Design
VCC
A.1 68-Pin PLCC Design for Serial Interface
Appendix A: RC224ATF Modem Designs
R13
2K
D6
R 1 4 2K
D7
R15 R16 330K C8 .1 R17 4.7K
2K
D8
R 1 8 2K
D9
VCC
R 1 9 2K
D10
R 2 0 2K
D11
Conexant
OH* RXA TXA1 TXA2 RING*
R 2 1 2K
D12
C12 .1 TO DAA INTERFACE U6 LM386 C16 2 7+ 35
R 2 2 2K
D13
C5 2200 pF C18 1 0 0 0 pF U2 R4 2.2K 3 4 5 6
CS SK DI DO
C19 .1 F C10 .1
LS1 220 16V C11 .1 C13 10 16V VCC
VCC NC NC GND
TO V.24 EIA-232-C INTERFACE TRANSCEIVERS
DTR* TXD* RI* CTS* RXD* CI* DCD* DSR*
15 66 59 58 10 1 56 30 46 44 41 37 57 14 11 67 2 20 21 6 19 68 63 13 65 64 62 4 12 17 18 5 60 61 VCC NMI* XTLO XTLI AAE* DCDL* PH2 NC NC NC NC NC TEST* RESET* DTRL* MR* IDLENO DTR* IDLEN1 WAKEUP* TXD* RI* CTS* RXD* CI*/HS DCD* DSR* NC NC NC NC SEREN* DGND1 DGND2 VAA TDACO TDACI MODEO MODEI TRSTO TRSTI RRSTO RRSTI RSTBO RSTBI TSTBO TSTBI RADCO RADCI RAGCO RAGCI TLKRLY* OHRLY* RXA TXA1 TXA2 RING* VC A/A1* AGCIN RFILO SLEEP* SLEEPI* SPKR AGND NVRDIO NVRSK NVRCS
53 29 49 28 52 27 50 26 47 25 45 24 51 48 23 22 43 38 40 33 32 31 3 36 9 35 34 55 42 54 39 8 16 7
161201
R6781-11
2 1 8 7 HY93C46J C6 22 10V
RC224ATL/224ATLV
EmbeddedModem Family
D224ATLVDSC
EmbeddedModem Family
D224ATLVDSC
K1 T1 LINE R9 1.5K TTC143 RELAY VCC R1 R3 100K U1 5 2 3 1 4 N 35 D3 1 N 4148 4 6 C3 .47 10% 250V R2 7.5K 1W D1 1 N 970B 18 1W R11 0 RV1 V150LA2 C4 .01 3 VCC 2 0 4 1 R10
RC224ATL/224ATLV
OH*
Figure A-2. Serial Interface Design DAA
RXA
J4 T E L CO4/6
C20 .1
8 1 2 3 4 5 6 7
D4 1 N 749A
TOP
R6 536 1%
D5 1 N 749A
TXA1
TXA2
Conexant
RING*
C2 .001 10% 1KV
8 1 2 3 4 5 6 7
J3 T E L CO4/6
C1 .001 10% 1KV
TOP
Appendix A: RC224ATF Modem Designs
A.1 68-Pin PLCC Design for Serial Interface
D2 1 N 970B
A-3
Appendix A: RC224ATF Modem Designs
A.1 68-Pin PLCC Design for Serial Interface
RC224ATL/224ATLV
EmbeddedModem Family
Table A-1. Serial Bill of Materials (1 of 2) Item
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
Quantity
2 1 1 1 1 2 9 1 1 1 1 2 1 2 8 2 1 1 1 1 1 1 1 1 1 1 2 1 8 C2,C1 C3 C4 C5 C6 C7,C17
Reference
0.001 0.47 .01 2200 pF 22 56 pF 0.1 12 10 220 1000 pF 1N970B 1N4148 1N749A
Part
C8,C10,C11,C12,C14,C15,C19, C20,C21 C9 C13 C16 C18 D1,D2 D3 D5,D4 D6,D7,D8,D9,D10,D11,D12,D13 J4,J3 K1 LS1 L1 RV1 R1 R2 R3 R4 R6 R9 R11,R10 R12 R13,R14,R15,R18,R19,R20,R21, R22
TELCO4/6 RELAY 161201 47 V150LA2 18 7.5 k 100 k 2.2 k 536 1.5 k 0 100 2k
A-4
Conexant
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
Table A-1. Serial Bill of Materials (2 of 2) Item
30 31 32 33 34 35 36 37
Appendix A: RC224ATF Modem Designs
A.1 68-Pin PLCC Design for Serial Interface
Quantity
1 1 1 1 1 1 1 1 R16 R17 T1 U1 U2 U6 U7 Y1
Reference
330 k 4.7 k TTC143 4N35
Part
HY93C46J LM386 R6781-11 16.000312 MHz
D224ATLVDSC
Conexant
A-5
Appendix A: RC224ATF Modem Designs
A.2 68-Pin PLCC Design for Parallel Interface
RC224ATL/224ATLV
EmbeddedModem Family
A.2 68-Pin PLCC Design for Parallel Interface
Figure A-3 and Figure A-4 provide the schematic of a RC224ATF 68-pin PLCC parallel interface board design. Table A-2 lists the bill of materials for this design.
A-6
Conexant
D224ATLVDSC
2
EmbeddedModem Family
1
C19 .1 F C5 2200 pF C10 C18 1 0 0 0 pF U2 R4 2.2K
3 4 5 6
6 1
4 8
D224ATLVDSC
VCC VCC C14 .1 C15 .1 DECOUPLING CAPS C21 .1 R12 100 Y1 3 1 6 .000312MHZ C8 .1 R13 10K U7 C9 12 10% 20V VCC L1 47
RC224ATL/224ATLV
Figure A-3. Parallel Interface Design
C 5 6 PF 5%
C1 56P 5%
HINT HCS* HDIS
VCC
Conexant
OH* RXA TXA1 TXA2 RING* HD0 HD1 HD2 HD3 HD4 HD5 HD6 HD7 HWT* HRD* HA0 HA1 HA2 R E S ET*
TO DAA INTERFACE
C12 .1
2 7 3 .1 C11 .1
+ -
U6 LM386 5 C13
C16 220 16V
LS1
15 66 59 58 12 57 16 6 17 37 41 44 46 30 18 20 21 62 63 64 65 67 68 1 2 5 4 11 10 8 14 60 61 39 VCC NMI* XTLO XTLI IDLENO TEST* HINT HCS* HDIS NC NC NC NC NC NC NC IDLENI HD0 HD1 HD2 HD3 HD4 HD5 HD6 HD7 HWT* HRD* HA0 HA1 HA2 RESET* DGND1 DGND2 AGND VAA TDACO TDACI MODEO MODEI TRSTO TRSTI RRSTO RRSTI RSTBO RSTBI TSTBO TSTBI RADCO RADCI RAGCO RAGCI TLKRLY* OHRLY* RXA TXA1 TXA2 RING* VC A/A1* AGCIN RFILO SLEEP* SLEEPI* SPKR PH2 NVRDIO NVRSK NVRCS
53 29 49 28 52 27 50 26 47 25 45 24 51 48 23 22 43 38 40 33 32 31 3 36 9 35 34 55 42 54 56 19 13 7
161201
R 6 781
VCC
CS SK DI DO VCC NC NC GND
2 1 8 7
10 16V
Appendix A: RC224ATF Modem Designs
A.2 68-Pin PLCC Design for Parallel Interface
HY93C46J
C6 22 10V
A-7
A-8
K1 T1 4 LINE 3 TTC143 RELAY VCC R1 R3 100K U1 5 4 6 4 N 35 1 D3 1 N 4148 3 2 R11 0 RV1 V150LA2 VCC 2 0
TOP
OH* 1 R10
Appendix A: RC224ATF Modem Designs
Figure A-4. Parallel Interface Design DAA
RXA C4 .01 R9 1.5K
A.2 68-Pin PLCC Design for Parallel Interface
C20 .1
8 1 2 3 4 5 6 7
J4 T E L CO4/6
R6 536 1%
D4 1 N 749A
D5 1 N 749A
TXA1
TXA2
18 C3 1W .47 10% 250V R2 7.5K 1W D1 1 N 970B C2 .001 10% 1KV
Conexant
RING*
C1 .001 10% 1KV
8 1 2 3 4 5 6 TOP 7
J3 T E L CO4/6
D2 1 N 970B
RC224ATL/224ATLV
EmbeddedModem Family
D224ATLVDSC
RC224ATL/224ATLV
EmbeddedModem Family
Appendix A: RC224ATF Modem Designs
A.2 68-Pin PLCC Design for Parallel Interface
Table A-2. Parallel Billing Materials (1 of 2) Item
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
Quantity
2 1 1 1 1 2 8 1 1 1 1 1 2 1 2 2 1 1 1 1 1 1 1 1 1 1 2 1 1 C2,C1 C3 C4 C5 C6 C7,C17
Reference
0.001 0.47 0.01
Part
2200 pF 22 56 pF 0.1 12 10 220 1000 pF 0.1 F 1N970B 1N4148 1N749A TELCO4/6 RELAY 161201 47 V150LA2 18 7.5 k 100 k 2.2 k 536 1.5 k 0 100 10 k
C8,C10,C11,C12,C14,C15,C20, C21 C9 C13 C16 C18 C19 D1,D2 D3 D5,D4 J4,J3 K1 LS1 L1 RV1 R1 R2 R3 R4 R6 R9 R11,R10 R12 R13
D224ATLVDSC
Conexant
A-9
Appendix A: RC224ATF Modem Designs
A.2 68-Pin PLCC Design for Parallel Interface
RC224ATL/224ATLV
EmbeddedModem Family
Table A-2. Parallel Billing Materials (2 of 2) Item
30 31 32 33 34 35
Quantity
1 1 1 1 1 1 T1 U1 U2 U6 U7 Y1
Reference
Part
TTC143 4N35 HY93C46J LM386 R6781 16.000312 MHz
A-10
Conexant
D224ATLVDSC
B
Appendix B: Acronyms/Abbreviations
A-B
AGC AT Automatic Gain Control Attention Code
C
CCITT CRC CTS International Telegraph and Telephone Consultative Committee Cyclic Redundancy Check Clear to Send
D
DAC DCE DTE DTMF DTR Digital-to-Analog Converter Data Communication Equipment Host Data Terminal Equipment Dual-Tone Multifrequency Data Terminal Ready (name of bit and function)
E-F
EOP FCS End of Process Frame Check Sequence
I
IER IIR Interrupt Enable Register Interrupt Identifier Register
L
LCR LED LSR Line Control Register Light Emitting Diode Line Status Register
D224ATLVDSC
Conexant
B-1
Appendix B : Acronyms/Abbreviations
RC224ATL/224ATLV
EmbeddedModem Family
M
MCR MCU MSR Modem Control Register Microcontroller Unit Modem Status Register
O-P
OEM op amp PBX Original Equipment Manufacturer operational amplifier Private Branch Exchange
R-S
RBR RTS SCR Receiver Buffer Register Request to Send (name of bit and function) Scratchpad Register
T-U
THR TTL UART Transmit Holding Register Transistor-to-Transistor Logic Universal Asynchronous Receiver/Transmitter
X
X-on/X-off Transistor On/Off
B-2
Conexant
D224ATLVDSC
0.0 Sales Offices
Further Information literature@conexant.com 1-800-854-8099 (North America) 33-14-906-3980 (International) China Phone: (86 2) 6361 2515 Fax: (86 2) 6361 2516 Hong Kong Phone: (852) 2827 0181 Fax: (852) 2827 6488 India Phone: (91 11) 692 4780 Fax: (91 11) 692 4712 Korea Phone: (82 2) 565 2880 Fax: (82 2) 565 1440
cross ref
Web Site www.conexant.com
World Headquarters
Conexant Systems, Inc. 4311 Jamboree Road P. O. Box C Newport Beach, CA 92658-8902 Phone: (949) 483-4600 Fax: (949) 483-6375 U.S. Florida/South America Phone: (813) 799-8406 Fax: (813) 799-8306 U.S. Los Angeles Phone: (805) 376-0559 Fax: (805) 376-8180 U.S. Mid-Atlantic Phone: (215) 244-6784 Fax: (215) 244-9292 U.S. North Central Phone: (630) 773-3454 Fax: (630) 773-3907 U.S. Northeast Phone: (978) 692-7660 Fax: (978) 692-8185 U.S. Northwest/Pacific West Phone: (408) 249-9696 Fax: (408) 249-7113 U.S. South Central Phone: (972) 733-0723 Fax: (972) 407-0639 U.S. Southeast Phone: (770) 246-8283 Fax: (770) 246-0018 U.S. Southwest Phone: (949) 483-9119 Fax: (949) 483-9090
Europe Headquarters
Conexant Systems France Les Taissounieres B1 1681 Route des Dolines BP 283 06905 Sophia Antipolis Cedex France Phone: (33 4) 93 00 33 35 Fax: (33 4) 93 00 33 03 Europe Central Phone: (49 89) 829 1320 Fax: (49 89) 834 2734 Europe Mediterranean Phone: (39 02) 9317 9911 Fax: (39 02) 9317 9913 Europe North Phone: (44 1344) 486 444 Fax: (44 1344) 486 555 Europe South Phone: (33 1) 41 44 36 50 Fax: (33 1) 41 44 36 90
Middle East Headquarters
Conexant Systems Commercial (Israel) Ltd. P. O. Box 12660 Herzlia 46733, Israel Phone: (972 9) 952 4064 Fax: (972 9) 951 3924
Japan Headquarters
Conexant Systems Japan Co., Ltd. Shimomoto Building 1-46-3 Hatsudai, Shibuya-ku, Tokyo 151-0061 Japan Phone: (81 3) 5371-1567 Fax: (81 3) 5371-1501
APAC Headquarters
Conexant Systems Singapore, Pte. Ltd. 1 Kim Seng Promenade Great World City #09-01 East Tower Singapore 237994 Phone: (65) 737 7355 Fax: (65) 737 9077 Australia Phone: (61 2) 9869 4088 Fax: (61 2) 9869 4077
Taiwan Headquarters
Conexant Systems, Taiwan Co., Ltd. Room 2808, 333 International Trade Building Keelung Road, Section 1 Taipei 110, Taiwan, ROC Phone: (886 2) 2720 0282 Fax: (886 2) 2757 6760

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