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| data sheet d224atlvdsc march 25, 1999 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. functional block diagram v.24 eia-232-d interface modem data pump modem controller crystal telephone line interface modem led indictors optional nvram optional speaker distinguishing features ? data modes C ccitt v.22 bis (2400 bps), v.22 (1200 bps) C bell 212a (1200 bps) and 103 (300 bps) C enhanced at commands ? group 3 fax modes C v.29 (9600/7200 bps) transmit C v.27 ter (4800/2400 bps) transmit and receive C 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) C operating: 100 mw C sleepidle: 25 mw C sleepstop: 5 mw ? single +5 v power supply or dual + 3.3 vdd and + 5 vaa power supplies ? package options: C 68-pin plastic leaded chip carrier (plcc) C 100-pin plastic quad flat pack (pqfp)
d224atlvdsc conexant information provided by conexant systems, inc. (conexant) is believed to be accurate and reliable. however, no responsibility i s 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 conexan t products. conexant reserves the right to change circuitry at any time without notice. this document is subject to change withou t notice. conexant and whats 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. ? 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. ordering information replacement matrix marketing number manufacturing number dsp die number i/o & vcc vaa/codec package RC224ATL r6781-11 l2501 5v 5v 68 plcc RC224ATL r6781-12 l2501 5v 5v 100 pqfp RC224ATL r6781-13 l2503 5v 5v 68 plcc RC224ATL r6781-14 l2503 5v 5v 100 pqfp RC224ATLv r6781-21 l2531 3v 5v 68 plcc RC224ATLv r6781-22 l2531 3v 5v 100 pqfp marketing number manufacturing number package replaces RC224ATL r6781-11 68 plcc RC224ATL/v (r6641-14), RC224ATL (r6641-15), RC224ATL/vn (r6641-16), RC224ATLn (r6641-17), RC224ATL/ve (r6641-24), RC224ATLe (r6641-25) RC224ATL r6781-12 100 pqfp RC224ATL/v (r6641-18), RC224ATL (r6641-19), RC224ATL/vn (r6641-20), RC224ATLn (r6641-21), RC224ATL/ve (r6641-26), RC224ATLe (r6641-27) RC224ATL r6781-13 68 plcc RC224ATL/vn (r6641-36), RC224ATL/v (r6641-37), RC224ATLn (r6641-38), RC224ATL (r6641-39) RC224ATL r6781-14 100 pqfp RC224ATL/vn (r6641-40), rc224atatl/v (r6641-41), RC224ATL (r6641-43) RC224ATLv r6781-21 68 plcc n/a: new 3.3 v digital i/o RC224ATLv r6781-22 100 pqfp n/a: new 3.3 v digital i/o d224atlvdsc conexant iii table of contents list of figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii list of tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix 1.0 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.1 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2 technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2.1 general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.2.2 configurations and rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 1.2.3 operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.3.1 data modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.3.2 fax modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.4 data/fax auto answering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.5 data modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.6 equalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.7 scrambler/descrambler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 1.2.8 transmit level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 1.2.9 transmit tones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 1.2.10 receive level. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 1.2.11 receiver tracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 1.2.12 low power sleep mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 2.0 hardware interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.1 hardware interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 2.1.1 parallel interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6 2.1.2 serial/indicator interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 2.1.3 speaker interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 2.1.4 line interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 2.2 additional information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 table of contents RC224ATL/224atlv embeddedmodem family iv conexant d224atlvdsc 3.0 pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 4.0 at commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 5.0 s registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 6.0 operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6.1 data modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6.1.1 data mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6.1.2 data modem processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 6.1.3 call origination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2 6.1.4 call answering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2 6.1.5 call termination. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2 6.2 fax modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 6.2.1 fax mode selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 6.2.2 fax mode processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 6.2.3 fax origination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 6.2.4 fax answering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3 6.2.5 fax data transmission. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4 6.2.6 fax data reception . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4 6.2.7 fax control transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4 6.2.8 fax control reception . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5 6.2.9 fax i/o processing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5 6.3 fax enhanced flow control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7 6.3.1 parallel/serial interface selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7 6.3.2 fax v.42 buffer sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7 6.3.3 dte flow control operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8 6.4 data/fax auto answering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8 6.5 call progress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 2 6.5.1 call progress algorithms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12 6.5.2 ring detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13 7.0 electrical/mechanical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 7.1 interfacing the RC224ATLv . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 7.2 environmental requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 7.3 interface timing and waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2 appendix a: rc224atf modem designs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a-1 a.1 68-pin plcc design for serial interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a-1 a.2 68-pin plcc design for parallel interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a-6 appendix b: acronyms/abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . b-1 RC224ATL/224atlv list of figures embeddedmodem family d224atlvdsc conexant v list of figures figure 2-1. RC224ATLv signalsparallel interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2- 2 figure 2-2. RC224ATLv signalsserial interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 -3 figure 3-1. 68-pin plcc packageserial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 figure 3-2. 68-pin plcc packageparallel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2 figure 3-3. 100-pin pqfp packageserial. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3 figure 3-4. 100-pin pqfp packageparallel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4 figure 3-5. nvram timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-20 figure 7-1. timing waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3 figure 7-2. 68-pin plcc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7 figure 7-3. 100-pin pqfp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9 figure a-1. serial interface design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a-2 figure a-2. serial interface design daa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a-3 figure a-3. parallel interface design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a-7 figure a-4. parallel interface design daa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a-8 list of figures RC224ATL/224atlv embeddedmodem family vi conexant d224atlvdsc RC224ATL/224atlv list of tables embeddedmodem family d224atlvdsc conexant vii list of tables table 1-1. configurations and rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 table 1-2. data rates vs. connection modem rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1- 3 table 1-3. dial digits/tone pairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 table 1-4. current and power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5 table 2-1. parallel interface registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 table 2-2. programmable baud rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12 table 3-1. RC224ATL/224atlv 68-pin plcc pin assignmentsserial mode . . . . . . . . . . . . . . . . . . . 3-5 table 3-2. RC224ATLv 68-pin plcc pin assignmentsparallel mode. . . . . . . . . . . . . . . . . . . . . . . . . 3-6 table 3-3. RC224ATL/224atlv 100-pin pqfp pin assignmentsserial . . . . . . . . . . . . . . . . . . . . . . . 3-7 table 3-4. RC224ATL/224atlv 100-pin pqfp pin assignmentsparallel . . . . . . . . . . . . . . . . . . . . . 3-11 table 3-5. hardware interface signal definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-15 table 4-1. result codes and messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 table 4-2. at command set summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 table 4-3. fax command set summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7 table 5-1. s register summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2 table 5-2. s register description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3 table 6-1. data rate selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 table 6-2. terminal called by a 1200 bps data modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10 table 6-3. terminal called by a fax machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-11 table 6-4. tone characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12 table 6-5. fax class 1 calling sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13 table 6-6. fax class 1 answering sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-15 table 7-1. environmental specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 table 7-2. timingChost bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2 table 7-3. current and power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-4 table 7-4. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4 table 7-5. digital interface characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5 table 7-6. analog interface characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6 table 7-7. 68-pin plcc dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8 table 7-8. 100-pin pqfp dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10 table a-1. serial bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a-4 table a-2. parallel billing materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . a-9 list of tables RC224ATL/224atlv embeddedmodem family viii conexant d224atlvdsc d224atlvdsc conexant 1-1 1 1.0 functional description 1.1 overview the conexant RC224ATLv is a combination v.22 bis data and group 3 fax 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.42 lapm, mnp2-4) and data compression (v.42 bis, 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.24 logic-compatible interface with transistor to 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. 1.0 functional description RC224ATL/224atlv 1.2 technical specifications embeddedmodem family 1-2 conexant d224atlvdsc 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%, C 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 modulation transmitter carrier frequency (hz) 0.01% data rate (bps) baud (symbols/sec.) bits per symbol constellation points data mode v.22 bis v. 2 2 bell 212a bell 103 qam dpsk dpsk fsk answer 2400 2400 2400 2225 m 2025 s originate 1200 1200 1200 1270 m 1070 s 2400 1200 1200 300 600 600 600 300 4 2 2 1 16 4 4 1 fax mode v. 2 9 v. 2 7 t e r v. 2 1 qam qam dpsk dpsk fsk receive n/a n/a 1800 1800 1650 m 1850 s transmit 1700 1700 1800 1800 1650 m 1850 s 9600 7200 4800 2400 300 2400 2400 1600 1200 300 4 3 3 2 1 16 8 8 4 1 legend: qam quadrature amplitude modulation dpsk differential phase shift keying fsk frequency shift keying m mark condition s space condition n/a not applicable RC224ATL/224atlv 1.0 functional description embeddedmodem family 1.2 technical specifications d224atlvdsc conexant 1-3 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 . 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.27 ter, v.22 bis, v.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. table 1-2. data rates vs. connection modem rate originate modem rate (bps) connect speed based on answer modem rate (bps) 300 1200 2400 300 300 300 300 1200 300 1200 1200 2400 300 1200 2400 1.0 functional description RC224ATL/224atlv 1.2 technical specifications embeddedmodem family 1-4 conexant d224atlvdsc 1.2.8 transmit level the transmit level is C 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 an answer tone of 2100 hz (v.22 bis, v.22, or t.30) or 2225 hz (bell 212a or 103) is generated. guard tone an 1800 hz guard tone can be generated in all data modes. calling tone 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 C 9 dbm to C 43 dbm. the carrier detect is on at C 43 dbm and off at C 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.22 bis or v.27 ter) or 0.02% (v.22 or bell 212a). dtmf dialing 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 detection 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 tone 1 frequency (hz) tone 2 frequency (hz) 0 941 1336 1 697 1209 2 697 1336 3 697 1477 4 770 1209 5 770 1336 RC224ATL/224atlv 1.0 functional description embeddedmodem family 1.2 technical specifications d224atlvdsc conexant 1-5 1.2.12 low power sleep mode to conserve power, the RC224ATLv has two selectable sleep (power-down) modes C 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 . 6 770 1477 7 852 1209 8 852 1336 9 852 1477 * 941 1209 # 941 1477 a 697 1633 b 770 1633 c 852 1633 d 941 1633 table 1-3. dial digits/tone pairs (2 of 2) dial digit tone 1 frequency (hz) tone 2 frequency (hz) table 1-4. current and power requirements mode current (id) power (pd) typical current @ 25 c maximum current @ 0 c typical power @ 25 c maximum power @ 0 c operating 21 ma 22 ma 100 mw 110 mw sleep C idle 5 ma 6 ma 25 mw 30 mw sleep C stop 1 ma 1 ma 5 mw 5 mw note(s): 1. test conditions: vdd = 5.0 v dc for typical values; vdd = 5.25 v dc for maximum values. 2. test conditions: vdd = 3.3 v dc for typical values; vdd = 3.6 v dc for maximum values. 1.0 functional description RC224ATL/224atlv 1.2 technical specifications embeddedmodem family 1-6 conexant d224atlvdsc 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 parallel interface configuration wake-up occurs when a ring signal occurs, or the host write to the modem. wake-up serial interface configuration wake-up occurs when a ring signal occurs, or the dte sends a character to the modem. d224atlvdsc conexant 2-1 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, timingChost 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. 2.0 hardware interface RC224ATL/224atlv embeddedmodem family 2-2 conexant d224atlvdsc figure 2-1. RC224ATLv signalsparallel interface host computer parallel bus crystal hdis hcs hrd hwt hint ha0 ha1 ha2 hd0 hd1 hd2 hd3 hd4 hd5 hd6 hd7 reset xtli xtlo RC224ATL RC224ATLv modem optional nvrcs nvrsk nvram nvrdio rfilo agcin sleep mode interface sleep idlen0 idlen1 optional speaker amplifier spkr telephone line interface a/a1 ring tlkrelay ohrelay txai txa2 rxa RC224ATL/224atlv 2.0 hardware interface embeddedmodem family d224atlvdsc conexant 2-3 figure 2-2. RC224ATLv signalsserial interface v.2 4 eia-232-d interface crystal mr dcdl dtrl rxd ci /hs dcd dsr ri cts txd dtr reset xtli xtlo RC224ATL RC224ATLv modem optional nvrcs nvrsk nvram nvrdio rfilo agcin sleep mode interface sleep idlen0 idlen1 optional speaker amplifier spkr telephone line interface a/a1 ring tlkrelay ohrelay txai txa2 rxa led indicators wakeup aae seren +5 v 2.0 hardware interface RC224ATL/224atlv embeddedmodem family 2-4 conexant d224atlvdsc the parallel interface registers are identified in table 2-1 . table 2-1. parallel interface registers (1 of 2) register number register name bit number 7 6 5 4 3 2 1 0 7 scratch register (scr) scratch register 6modem status register (msr) data carrier detect (dcd) ring indicator (ri) data set ready (dsr) clear to send (cts) delta data carrier detect (ddcd) trailing edge of ring indicator (teri) delta data set ready (ddsr) delta clear to send (dcts) 5line status register (lsr) 0 transmitter empty (temt) transmitter holding register (thre) break interrupt (bi) framing error (fe) parity error (pe) overrun error (oe) data ready (dr) 4modem control register (mcr) 0 0 0 local loopback out 2 out 1 request to send (rts) data terminal ready (dtr) 3line control register (lcr) divisor latch access bit (dlab) set break (sb) stick parity (sp) even parity select (eps) parity enable (pen) number of stop bits (stb) word length select bit 1 (wls1) word length select bit 0 (wls0) 2 interrupt identify register (iir) (read only) 0 0 0 0 0 pending interrupt id bit 1 (pl1) pending interrupt id bit 0 (pl0) 0 if interrupt pending (ip) 1 dlab = 0 interrupt enable register (ier) 0000enable modem status interrupt (edssi) enable receiver line status interrupt (elsi) enable transmitter holding register empty interrupt (etbei) enable received data available interrupt (erbfi) 0 dlab = 0 transmitter holding register (thr) transmitter holding register (write only) 0 dlab = 0 receiver buffer register (rbr) receiver buffer register (read only) RC224ATL/224atlv 2.0 hardware interface embeddedmodem family d224atlvdsc conexant 2-5 1 dlab = 1 divisor latch msb register (dlm) divisor latch (ms) 0 dlab = 1 divisor latch lsb register (dll) divisor latch (ls) table 2-1. parallel interface registers (2 of 2) register number register name bit number 7 6 5 4 3 2 1 0 2.0 hardware interface RC224ATL/224atlv 2.1 hardware interface embeddedmodem family 2-6 conexant d224atlvdsc 2.1 hardware interface 2.1.1 parallel interface a 16450 uart-compatible parallel interface is provided. host bus interface eight data lines, three address lines, and four control lines are supported. interrupt enable register (addr=1, dlab=0) 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 0C3 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). bits 4-7: not used (always logic 0). edssi 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. elsi 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. etbei 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. erbfi 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. 7 6 5 4 3 2 1 0 0 0 0 0 edssi elsi etbei erbfi RC224ATL/224atlv 2.0 hardware interface embeddedmodem family 2.1 hardware interface d224atlvdsc conexant 2-7 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. bits 3-7: not used (always 0). pl0-1 highest priority pending interrupt. these two bits identify the highest priority pending interrupt. priority 2 1 level pending interrupt 1 1 (highest) receiver line status 1 0 2 receiver buffer full 0 1 3 transmitter holding register empty 0 0 4 modem status ip 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. 7 6 5 4 3 2 1 0 00000pl1pl0ip 2.0 hardware interface RC224ATL/224atlv 2.1 hardware interface embeddedmodem family 2-8 conexant d224atlvdsc line control register (addr = 3) the line control register (lcr) specifies the format of the asynchronous data communications exchange. 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. sb 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. sp 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. eps 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). pen 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. stb 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. 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 bit 0 word length 0 0 5 bits 0 1 6 bits 1 0 7 bits 1 1 8 bits 7 6 5 4 3 2 1 0 dlab sb sp eps pen stb wls1 wls0 RC224ATL/224atlv 2.0 hardware interface embeddedmodem family 2.1 hardware interface d224atlvdsc conexant 2-9 modem control register (addr = 4) the modem control register (mcr) controls the interface with the modem or data set. bit 5-7: not used (always 0). ll 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. out2 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. out1 output 1 . this bit is used in local loopback (see mcr4). rts 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. dtr 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. 7 6 5 4 3 2 1 0 0 0 0 ll out2 out1 rts dtr 2.0 hardware interface RC224ATL/224atlv 2.1 hardware interface embeddedmodem family 2-10 conexant d224atlvdsc line status register (addr = 5) the lsr, an 8-bit register, provides status information to the host concerning data transfer. bit 7: this bit is set to logic 0. temt 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. thre 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. bi 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. fe 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. pe 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. oe 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. dr 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. 7 6 5 4 3 2 1 0 0temtthrebi fe pe oe dr RC224ATL/224atlv 2.0 hardware interface embeddedmodem family 2.1 hardware interface d224atlvdsc conexant 2-11 modem status register (addr = 6) the modem status register (msr) reports the modems 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. 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). ri 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). dsr 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). cts 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). ddcd 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. teri 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. ddsr 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. dcts 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. receiver buffer 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. transmitter holding register (addr=0, dlab=0) 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. 7 6 5 4 3 2 1 0 dcd ri dsr cts ddcd teri ddsr dcts 2.0 hardware interface RC224ATL/224atlv 2.2 additional information embeddedmodem family 2-12 conexant d224atlvdsc 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. 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.25 bis commands, is provided for an 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 designers guide (order no. 821). table 2-2. programmable baud rates divisor latch (hex) divisor (decimal) baud rate ms ls 01 00 00 00 80 c0 60 30 384 192 96 48 300 600 1200 2400 d224atlvdsc conexant 3-1 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 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 dgnd1 xtlo xtli test f 2 sleep spkr vaa modei tstbi trsti tdaci radco rrsti nc rstbi nc 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 a/a1 nvrdio nvrcs wakeup seren nc ring idlen0 dcdl ri mr nmi ci/hs dcd cts dsr dgnd2 9 8 7 6 5 4 3 2 1 68 67 66 65 64 63 62 61 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 trsto modeo tdaco nc txa2 txa1 rxa rfilo agcin vc nc tlkrelay agnd ohrelay nc sleepi ragci 3.0 pin descriptions RC224ATL/224atlv embeddedmodem family 3-2 conexant d224atlvdsc figure 3-2. 68-pin plcc package parallel 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 dgnd1 xtlo xtli test f 2 sleep spkr vaa modei tstbi trsti tdaci radco rrsti nc rstbi nc 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 a/a1 ha2 nvrcs hcs hwt hrd ring hd7 hd6 hd5 hd4 nmi hd3 hd2 hd1 hd0 dgnd2 9 8 7 6 5 4 3 2 1 68 67 66 65 64 63 62 61 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 trsto modeo tdaco nc txa2 txa1 rxa rfilo agcin vc nc tlkrelay agnd ohrelay nc sleepi ragci RC224ATL/224atlv 3.0 pin descriptions embeddedmodem family d224atlvdsc conexant 3-3 figure 3-3. 100-pin pqfp package serial 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 nc nc nc nc nc tlkrelay agnd ohrelay nc nc sleepi ragci agnd rstbi rrsti radco tdaci trsti tstbi nc 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 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 f 2 nc 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 nc nc nc dgnd nc nc txd nc nc nvrsk nc vcc vcc reset rxd nc dtrl aae nc dgnd 3.0 pin descriptions RC224ATL/224atlv embeddedmodem family 3-4 conexant d224atlvdsc figure 3-4. 100-pin pqfp package parallel 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 nc nc nc nc nc tlkrelay agnd ohrelay nc nc sleepi ragci agnd rstbi rrsti radco tdaci trsti tstbi nc 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 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 f 2 nc 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 nc nc nc dgnd nc nc nvrdio nc hdis hint nc vcc vcc reset nvrsk idleno ha0 ha1 nc dgnd RC224ATL/224atlv 3.0 pin descriptions embeddedmodem family d224atlvdsc conexant 3-5 table 3-1. RC224ATL/224atlv 68-pin plcc pin assignments serial mode pin number signal label i/o type pin number signal label i/o type 1dcdl d0 35 agcin 2 idlen0 di 36 vc 3 ring di 37 nc 4 nc 38 tlkrelay od 5 seren di 39 agnd 6wakeup di 40 ohrelay od 7 nvrcs do 41 nc 8 nvrdio di 42 sleepi di 9a/a1 do 43 ragci mi to ragco 10 aae do 44 nc 11 dtrl do 45 rstbi mi to rstbo 12 nc 46 nc 13 rxd do 47 rrsti mi to rrsto 14 reset di 48 radco radco 15 vcc 49 tdaci mi to tadco 16 nvrsk do 50 trsti mi to trsto 17 nc 51 tstbi mi to tstbo 18 nc 52 modei mi to modeo 19 txd di 53 vaa 20 dtr di 54 spkr o(df) 21 idlen1 di 55 sleep do 22 ragco mi to ragci 56 f 2do 23 radci mi to radco 57 test di 4.7k to vcc 24 tstbo mi to tstbi 58 xtli ie 25 rstbo mi to rstbi 59 xtlo oe 26 rrsto mi to rrsti 60 dgnd1 27 trsto mi to trsti 61 dgnd2 28 modeo mi to modei 62 dsr do 29 tdaco mi to tdaci 63 cts do 30 nc 64 dcd do 31 txa2 o (dd) 65 ci /hs do 32 txa1 o(dd) 66 nmi di 33 rxa i(da) 67 mr do 34 rfilo 68 ri do 3.0 pin descriptions RC224ATL/224atlv embeddedmodem family 3-6 conexant d224atlvdsc table 3-2. RC224ATLv 68-pin plcc pin assignments parallel mode pin number signal label i/o type pin number signal label i/o type 1 hd6 dio 35 agcin 2 hd7 dio 36 vc 3 ring di 37 nc 4 hrd di 38 tlkrelay od 5hwt di 39 agnd 6hcs di 40 ohrelay od 7 nvrcs do 41 nc 8 ha2 di 42 sleepi di 9a/a1 do 43 ragci mi to ragco 10 ha1 di 44 nc 11 ha0 di 45 rstbi mi to rstbo 12 idlen0 46 nc 13 nvrsk do 47 rrsti mi to rrsto 14 reset di 48 radco radco 15 vcc 49 tdaci mi to tadco 16 hint do 50 trsti mi to trsto 17 hdis do 51 tstbi mi to tstbo 18 nc 52 modei mi to modeo 19 nvrdio dio 53 vaa 20 nc 54 spkr o(df) 21 idlen1 di 55 sleep oa 22 ragco mi to ragci 56 f 2oa 23 radci mi to radco 57 test 4.7k to vcc 24 tstbo mi to tstbi 58 xtli ie 25 rstbo mi to rstbi 59 xtlo oe 26 rrsto mi to rrsti 60 dgnd1 27 trsto mi to trsti 61 dgnd2 28 modeo mi to modei 62 hd0 dio 29 tdaco mi to tdaci 63 hd1 dio 30 nc 64 hd2 dio 31 txa2 o (dd) 65 hd3 dio 32 txa1 o(dd) 66 nmi di 33 rxa i(da) 67 hd4 dio 34 rfilo 68 hd5 dio RC224ATL/224atlv 3.0 pin descriptions embeddedmodem family d224atlvdsc conexant 3-7 table 3-3. RC224ATL/224atlv 100-pin pqfp pin assignments serial (1 of 4) pin number signal label i/o type (1) 1dtr di 2idlen1 di 3ragco mi (2) to ragci 4 radci mi to radco 5 tstbo mi to tstbi 6 nc (3) 7nc 8nc 9 rstbo mi to rstbi 10 rrsto mi to rrsti 11 trsto mi to trsti 12 modeo mi to modei 13 tdaco mi to tdaci 14 sleep do 15 nc 16 dgnd dgnd (4) 17 modei mi to modeo 18 vaa 19 spkr o(df) 20 nc 21 agnd agnd 22 txa2 o(dd) 23 txa1 o(dd) 24 nc 25 rxa i(da) 26 nc 27 rfilo note(s): (1) i/o types are described in figure 7-5, digital interface characteristics and figure 7-6, analog interface characteristics . (2) mi = modem interconnection (3) nc = no external connection (may have internal connection, leave pin disconnected (open)). (4) agnd is analog ground and dgnd is digital ground. (5) connect to vcc through 4.7 k w . (6) connect atl to + 5 vcc, atlv to + 3 vcc. 3.0 pin descriptions RC224ATL/224atlv embeddedmodem family 3-8 conexant d224atlvdsc 28 agcin 29 vc 30 agnd agnd 31 nc 32 nc 33 nc 34 nc 35 nc 36 tlkrelay od 37 agnd agnd 38 ohrelay od 39 nc 40 nc 41 sleepi di 42 ragci mi to ragco 43 agnd agnd 44 rstbi mi to rstbo 45 rrsti mi to rrsto 46 radco mi to radci 47 tdaci mi to tdaco 48 trsti mi to trsto 49 tstbi mi to tstbo 50 nc 51 nc 52 f 2do 53 test (5) 54 xtli ie table 3-3. RC224ATL/224atlv 100-pin pqfp pin assignments serial (2 of 4) pin number signal label i/o type (1) note(s): (1) i/o types are described in figure 7-5, digital interface characteristics and figure 7-6, analog interface characteristics . (2) mi = modem interconnection (3) nc = no external connection (may have internal connection, leave pin disconnected (open)). (4) agnd is analog ground and dgnd is digital ground. (5) connect to vcc through 4.7 k w . (6) connect atl to + 5 vcc, atlv to + 3 vcc. RC224ATL/224atlv 3.0 pin descriptions embeddedmodem family d224atlvdsc conexant 3-9 55 xtlo oe 56 nc 57 dgnd dgnd 58 dgnd dgnd 59 nc 60 nc 61 dsr do 62 cts do 63 dcd do 64 ci /hs do 65 nmi (6) 66 dgnd dgnd 67 nc 68 mr do 69 ri do 70 dcdl do 71 idleno di 72 ring di 73 nc 74 nc 75 seren di 76 wakeup di 77 nvrcs do 78 nvrdio dio 79 (a/a1) do 80 dgnd dgnd 81 dgnd dgnd table 3-3. RC224ATL/224atlv 100-pin pqfp pin assignments serial (3 of 4) pin number signal label i/o type (1) note(s): (1) i/o types are described in figure 7-5, digital interface characteristics and figure 7-6, analog interface characteristics . (2) mi = modem interconnection (3) nc = no external connection (may have internal connection, leave pin disconnected (open)). (4) agnd is analog ground and dgnd is digital ground. (5) connect to vcc through 4.7 k w . (6) connect atl to + 5 vcc, atlv to + 3 vcc. 3.0 pin descriptions RC224ATL/224atlv embeddedmodem family 3-10 conexant d224atlvdsc 82 nc 83 aae do 84 dtrl do 85 nc 86 rxd do 87 reset ic 88 vcc (6) 89 vcc (6) 90 nc 91 nvrsk do 92 nc 93 nc 94 txd di 95 nc 96 nc 97 dgnd dgnd 98 nc 99 nc 100 nc table 3-3. RC224ATL/224atlv 100-pin pqfp pin assignments serial (4 of 4) pin number signal label i/o type (1) note(s): (1) i/o types are described in figure 7-5, digital interface characteristics and figure 7-6, analog interface characteristics . (2) mi = modem interconnection (3) nc = no external connection (may have internal connection, leave pin disconnected (open)). (4) agnd is analog ground and dgnd is digital ground. (5) connect to vcc through 4.7 k w . (6) connect atl to + 5 vcc, atlv to + 3 vcc. RC224ATL/224atlv 3.0 pin descriptions embeddedmodem family d224atlvdsc conexant 3-11 table 3-4. RC224ATL/224atlv 100-pin pqfp pin assignmentsparallel (1 of 4) pin number signal label i/o type (1) 1nc 2idlen1 di 3ragco mi (2) to ragci 4 radci mi to radco 5 tstbo mi to tstbi 6 nc (3) 7nc 8nc 9 rstbo mi to rstbi 10 rrsto mi to rrsti 11 trsto mi to trsti 12 modeo mi to modei 13 tdaco mi to tdaci 14 sleep do 15 nc 16 dgnd dgnd (4) 17 modei mi to modeo 18 vaa 19 spkr o(df) 20 nc 21 agnd agnd 22 txa2 o(dd) 23 txa1 o(dd) 24 nc 25 rxa i(da) 26 nc note(s): (1) i/o types are described in figure 7-5, digital interface characteristics and figure 7-6, analog interface characteristics . (2) mi = modem interconnection. (3) nc = no external connection (may have internal connection, leave pin disconnected (open)). (4) agnd is analog ground and dgnd is digital ground. (5) connect to vcc through 4.7 k w . (6) connect atl to + 5 vcc, atlv to + 3 vcc. 3.0 pin descriptions RC224ATL/224atlv embeddedmodem family 3-12 conexant d224atlvdsc 27 rfilo 28 agcin 29 vc 30 agnd agnd 31 nc 32 nc 33 nc 34 nc 35 nc 36 tlkrelay do 37 agnd agnd 38 ohrelay do 39 nc 40 nc 41 sleepi di 42 ragci mi to ragco 43 agnd agnd 44 rstbi mi to rstbo 45 rrsti mi to rrsto 46 radco mi to radci 47 tdaci mi to tdaco 48 trsti mi to trsto 49 tstbi mi to tstbo 50 nc 51 nc 52 f 2di 53 test (5) table 3-4. RC224ATL/224atlv 100-pin pqfp pin assignmentsparallel (2 of 4) pin number signal label i/o type (1) note(s): (1) i/o types are described in figure 7-5, digital interface characteristics and figure 7-6, analog interface characteristics . (2) mi = modem interconnection. (3) nc = no external connection (may have internal connection, leave pin disconnected (open)). (4) agnd is analog ground and dgnd is digital ground. (5) connect to vcc through 4.7 k w . (6) connect atl to + 5 vcc, atlv to + 3 vcc. RC224ATL/224atlv 3.0 pin descriptions embeddedmodem family d224atlvdsc conexant 3-13 54 xtli ie 55 xtlo oe 56 nc 57 dgnd dgnd 58 dgnd dgnd 59 nc 60 nc 61 hd0 dio 62 hd1 dio 63 hd2 dio 64 hd3 dio 65 nmi (6) 66 dgnd dgnd 67 nc 68 hd4 dio 69 hd5 dio 70 hd6 dio 71 hd7 dio 72 ring di 73 nc 74 hrd di 75 hwt di 76 hcs di 77 nvrcs do 78 ha2 di 79 (a/a1) do 80 dgnd dgnd table 3-4. RC224ATL/224atlv 100-pin pqfp pin assignmentsparallel (3 of 4) pin number signal label i/o type (1) note(s): (1) i/o types are described in figure 7-5, digital interface characteristics and figure 7-6, analog interface characteristics . (2) mi = modem interconnection. (3) nc = no external connection (may have internal connection, leave pin disconnected (open)). (4) agnd is analog ground and dgnd is digital ground. (5) connect to vcc through 4.7 k w . (6) connect atl to + 5 vcc, atlv to + 3 vcc. 3.0 pin descriptions RC224ATL/224atlv embeddedmodem family 3-14 conexant d224atlvdsc 81 dgnd dgnd 82 nc 83 ha1 di 84 ha0 di 85 idleno di 86 nvrsk do 87 reset ic 88 vcc (6) 89 vcc (6) 90 nc 91 hint do 92 hdis do 93 nc 94 nvrdio dio 95 nc 96 nc 97 dgnd dgnd 98 nc 99 nc 100 nc table 3-4. RC224ATL/224atlv 100-pin pqfp pin assignmentsparallel (4 of 4) pin number signal label i/o type (1) note(s): (1) i/o types are described in figure 7-5, digital interface characteristics and figure 7-6, analog interface characteristics . (2) mi = modem interconnection. (3) nc = no external connection (may have internal connection, leave pin disconnected (open)). (4) agnd is analog ground and dgnd is digital ground. (5) connect to vcc through 4.7 k w . (6) connect atl to + 5 vcc, atlv to + 3 vcc. RC224ATL/224atlv 3.0 pin descriptions embeddedmodem family d224atlvdsc conexant 3-15 table 3-5. hardware interface signal definitions (1 of 5) label i/o type signal name/description system signals xtli xtlo ie oe 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 ic 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. seren di 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. vcc vaa pwr digital supply. +5 v/3.3v atlv 5% is required. analog supply. +5 v 5% is required. dgnd agnd gnd digital and analog grounds. 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 idlen0 mode l l idle mode disabled l h idle mode enabled h l stop mode disabled h h 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. sleepi di sleep mode. sleep input low causes the integrated analog (ia) to enter low-power sleep mode. 3.0 pin descriptions RC224ATL/224atlv embeddedmodem family 3-16 conexant d224atlvdsc wakeup di 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 do nvram chip select. nvrcs output high enables the nvram. nvrsk do nvram shift clock. the nvrsk output is used to shift data to or from the nvram. nvrdio dio 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 w . typically, the spkr output is an input to an external lm386 audio power amplifier. asynchronous serial interface (serial interface only; seren = low) rxd do received data. the modem presents received serial data to the rxd output pin. txd di transmitted data. the modem obtains serial data to be transmitted from the txd pin. dtr di 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. cts do clear to send. in data modes, the cts output is on; in fax modes, cts is optionally used for flow control. dsr do data set ready. the dsr output is controlled by the at&sn command. dcd do data carrier detected. the dcd output is controlled by the at&c command. ci /hs do calling indicator/high speed indicator. ci /hs output on (low) indicates modem connection at 2400 bps. ri do 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. mr do 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. table 3-5. hardware interface signal definitions (2 of 5) label i/o type signal name/description RC224ATL/224atlv 3.0 pin descriptions embeddedmodem family d224atlvdsc conexant 3-17 dcdl do dcd indicator. the dcdl output is controlled by the at&c command. dtrl do 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) cs2 hcs distr hwt dostr hrd intrpt hint ddis hdis out2 none (implemented internally in RC224ATLv) ha0-ha2 hd0-hd7 di dio host bus address lines 0-2. during a host read or write operation, signals ha0Cha2 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. hcs di host bus chip select . hcs input low enables reading from or writing to the modem using the parallel bus. hrd di 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. hwt di 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. table 3-5. hardware interface signal definitions (3 of 5) label i/o type signal name/description dlab ha2 ha1 ha0 register 0 0 0 0 receive buffer register (read), transmitter holding register (write) 0 0 0 1 interrupt enable register x 0 1 0 interrupt identification register (read only) x 0 1 1 line control register x 1 0 0 modem control register x 1 0 1 line status register (read only) x 1 1 1 scratch register 1 0 0 0 divisor latch register (least significant byte) 1 0 0 1 divisor latch register (most significant byte) 3.0 pin descriptions RC224ATL/224atlv embeddedmodem family 3-18 conexant d224atlvdsc hdis do 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. hint do 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. telephone line interface txa1 txa2 o(df) transmit analog 1 and 2. the txa1 and txa2 outputs are differential outputs. a 600 w 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. rxa i(da) receive analog. rxa is a single-ended receive data input from the telephone line interface. vc oa centerpoint voltage. a +2.5 vdc centerpoint voltage derived from an internal reference voltage. the txa1 and txa2 outputs are biased at vc. tlkrelay do talk/data relay driver. tlkrelay is an open drain output which can directly drive a relay with greater than 360 w 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. ohrelay do off-hook relay driver. ohrelay is an open drain output which can directly drive a relay with greater than 360 w 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 di 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 v rms , 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. a/a1 do key telephone hold indicator. a/a1 output low indicates that the telephone line is in use when used on multi-line key telephones. table 3-5. hardware interface signal definitions (4 of 5) label i/o type signal name/description RC224ATL/224atlv 3.0 pin descriptions embeddedmodem family d224atlvdsc conexant 3-19 modem interconnect rfilo mi 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. agcin mi receive agc gain amplifier input. see rfilo. modeo (dsp), modei (ia) mi mode control. direct modem interconnect line. tdaco (dsp), tdaci (ia) mi transmitter dac signal. serial digital dac signal. direct modem interconnect line. tstbo (dsp), tstbi (ia) mi transmitter strobe. 576 khz digital transmitter timing reference. direct modem interconnect line. trsto (dsp), trsti (ia) mi transmitter reset. 9.6 khz, 8228.57 hz, or 7.2 khz digital transmitter timing reference. direct modem interconnect line. radci (dsp), radco (ia) mi receiver adc signal. serial digital adc signal. direct modem interconnect line. ragco (dsp), ragci (ia) mi receiver agc signal. serial digital agc signal. direct modem interconnect line. rrsto (dps), rrsti (ia) mi receiver reset. 9.6 khz, 8228.57 hz, or 7.2 khz digital receiver timing reference. direct modem interconnect line. rstbo (dsp), rstbi (ia) mi receiver strobe. 576 khz digital receiver timing reference. direct modem interconnect line. table 3-5. hardware interface signal definitions (5 of 5) label i/o type signal name/description 3.0 pin descriptions RC224ATL/224atlv embeddedmodem family 3-20 conexant d224atlvdsc figure 3-5. nvram timing 4 s (1) nvrsk nvrdi nvrcs nvrdo t dis 0.4 s t dis 0.4 s t pdo 2 s t pdo 2 s t css 0.2 s t csh 0.0 s t dih 0.4 s t dih 0.4 s note(s): (1) this is the minimum nvrsk period. d224atlvdsc conexant 4-1 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 word code meaning 0 ok command line executed without errors 1 connect connection at 300 bps 2 ring ringing signal detected 3 no carrier carrier lost or never present 4 error invalid command, checksum, error in command line, or command line exceeds 40 characters 5 connect 1200 connection at 1200 bps 6 no dialtone no dial tone detected 7 busy busy signal detected 8 no answer no silence detected when dialing a system not providing a dial tone 10 connect 2400 connection at 2400 bps +f4 +fcerror fax carrier error 13 data connected as data modem during auto answer 15 fax connected as fax modem during auto answer 4.0 at commands RC224ATL/224atlv embeddedmodem family 4-2 conexant d224atlvdsc table 4-2. at command set summary (1 of 5) command function default parameters/description a/ re-execute command a answer a call at command line prefix parameters: none attention code. precedes the command line except for +++ (escape) and a/ (repeat) commands. bn select ccitt or bell mode parameters: n = 0,1 n = 1 n = 0 selects ccitt operation at 300 or 1200 bps during call establishment and a subsequent connection. n = 1 selects bell operation at 300 or 1200 bps during call establishment and a subsequent connection. cn carrier control parameters: n = 0,1 n = 1 d 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 !. dn dial modifier en command echo parameters: n = 0,1 n = 1 n = 0 disables command echo. n = 1 enables command echo. fn on-line character echo option parameters: n = 0,1 n = 1 n = 0 returns error result code. n = 1 returns ok result code. hn disconnect (hang-up) parameters: n = 0,1 n = 0 n = 0 modem on-hook (relay open). n = 1 modem off-hook (relay closed). in identification parameters: n = 0,1,2,3 n = 0 n = 0 reports product identification code. n = 1 calculates the rom checksum. n = 2 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. n = 3 reports the firmware version and rom part number. ln speaker volume parameters: n = 0,1,2,3 n = 2 n = 0 low volume. n = 1 low volume. n = 2 medium volume. n = 3 high volume. mn speaker control parameters: n = 0,1,2,3 n = 1 n = 0 speaker is always off. n = 1 speaker is on during call establishment, but off when receiving carrier. n = 2 speaker is always on. n = 3 speaker is on after dialing, until carrier is detected. on go on-line parameters: n = 0,1 n = 0 on-line state. n = 1 on-line state with equalizer retrain. p force pulse dialing qn quiet result codes control n = 0 n = 0 enables result codes to the dte. n = 1 disables result codes to the dte. RC224ATL/224atlv 4.0 at commands embeddedmodem family d224atlvdsc conexant 4-3 sn select s register as default range: n = 0-27 n establishes s-register n as the last register accessed. n = v sets s-register n to the value v. n? reports the value of s-register n. sn = parameters: none range: n = 0-27 (register no.) x=0-255 (value) 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. sn? parameters: none range: n = 0-27 reads an s register. sn? causes the contents stored in register n to be returned. t force dtmf dialing vn report codes form n = 1 n = 0 result code is sent as a digit. n = 1 result code is sent as ascii text. xn extended result codes n = 4 n = 0 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. n = 1 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. n = 2 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. n = 3 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. n = 4 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. yn long space disconnect n = 0 n = 0 disables long space disconnect. n = 1 enables long space disconnect. zn soft reset and restore profile n = 0 n = 0 soft reset. restores stored profile 0. n = 1 soft reset. restores stored profile 1. &cn rlsd (dcd) option n = 0 n = 0 rlsd remains on at all times. n = 1 rlsd follows the state of the carrier. table 4-2. at command set summary (2 of 5) command function default parameters/description 4.0 at commands RC224ATL/224atlv embeddedmodem family 4-4 conexant d224atlvdsc &dn dtr option n = 0 n = 0 modem ignores dtr. n = 1 modem assumes command state when on-to-off transition is detected on dtr. n = 2 modem hangs up, assumes command state and disables auto-answer upon detecting on-tooff transition on dtr. n = 3 modem assumes software reset state upon detecting on-to-off transition on dtr. &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 no guard tone. n = 1 550 hz guard tone. n = 2 1800 hz guard tone. &jn telephone jack control n = 0 n = 0 suitable for rj11, rj41s. or rj45s type phone jack. n = 1 suitable for rj12 or rj13 type phone jack; the a lead is connected to a1 lead while the modem is off-hook. &l0 dial-up line operation n = 0 n = 0 requests dial-up operation. &mn asynchronous mode n = 0 n = 0 asynchronous operation. n = 1 reserved n = 2 reserved n = 3 reserved &pn pulse dial make/break ratio n = 0 n = 0 selects 39%C61% make/break ratio at 10 pps. (usa/canada) n = 1 selects 33%C67% make/break ratio at 10 pps. (uk/hk) &q0 asynchronous mode n = 0 idle state on-line state n = 0 normal asynchronous n = 1 reserved reserved n = 2 reserved reserved n = 3 reserved reserved &sn dsr override n = 0 n = 0 dsr will remain on at all times. n = 1 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. table 4-2. at command set summary (3 of 5) command function default parameters/description RC224ATL/224atlv 4.0 at commands embeddedmodem family d224atlvdsc conexant 4-5 &tn test and diagnostic n = 4 n = 0 terminates test in progress. n = 1 initiates local analog loopback. n = 2 returns error. n = 3 initiates local digital loopback. n = 4 enables digital loopback acknowledgment from remote modem for rdl. n = 5 disables digital loopback acknowledgment from remote modem for rdl. n = 6 initiates remote digital loopback. (1) n = 7 initiates remote digital loopback with self test. (1) n = 8 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= &wn store current configuration n = 0 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 stores active profile in location 0. n = 1 stores active profile in location 1. &x0 asynchronous data transmission n = 0 n = 0 reserved n = 1 reserved n = 2 reserved &yn select default profile n = 0 the modem will use profile 0 on powerup. n = 1 the modem will use profile 1 on powerup. &zn = x store dial string to location n &zn = x n = 0 to 3 and x = dial string. (up to 36 characters) table 4-2. at command set summary (4 of 5) command function default parameters/description 4.0 at commands RC224ATL/224atlv embeddedmodem family 4-6 conexant d224atlvdsc %dn dtmf level attenuation %j load secondary defaults %ln transmit level attenuation dial modifier function p pulse dial parameters: none r originate call in answer mode parameters: none s=n dial stored number parameters: n = 0, 1, 2, 3 s RC224ATL/224atlv 4.0 at commands embeddedmodem family d224atlvdsc conexant 4-7 table 4-3. fax command set summary (1 of 2) fax command function default parameters/description +fclass=n service class n = 0 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) +f 4.0 at commands RC224ATL/224atlv embeddedmodem family 4-8 conexant d224atlvdsc +ftm=n transmit data n = 48 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 +frm=n receive data n = 48 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) ) +fth=n transmit data with hdlc framing n = 3 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 +frh=n receive data with hdlc framing n = 0 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 +frtn receive test data n = 48 receive test data. +frtn causes the modem to go off-hook and begin demodulating received data at the specified rate. n configuration/data rate n = 24 v.27 ter 2400 bps n = 48 v.27 ter 4800 bps +fttn = m transmit test data n = 96 m = 0 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 n = 24 v.27 ter 2400 bps n = 48 v.27 ter 4800 bps n = 72 v.29 7200 bps n = 96 v.29 9600 bps m test pattern m = 0 ascii data (20h - 7fh sequential) m = 1 all zeros m = 2 all ones m = 3 alternate 10 m = 4 sliding 0 (01111) m = 5 sliding 1 (00001) note(s): (1) modem will respond with error result code. table 4-3. fax command set summary (2 of 2) fax command function default parameters/description d224atlvdsc conexant 5-1 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) 5.0 s registers RC224ATL/224atlv embeddedmodem family 5-2 conexant d224atlvdsc table 5-1. s register summary register range units default description s0 (1) 0C255 rings 00 rings to auto-answer s1 0C255 rings 00 ring counter s2 0C127 ascii 43 escape character s3 0C127 ascii 13 carriage return character s4 0C127 ascii 10 line feed character s5 0C32, 127 ascii 08 backspace character s6 2C255 seconds 02 maximum time to wait for dial tone s7 1C255 seconds 30 wait for carrier s8 0C255 seconds 02 pause time for comma s9 1C255 1/10 seconds 06 carrier detect response time s10 1C255 1/10 seconds 14 carrier loss disconnect time s11 50C255 ms 95 dtmf dialing speed s12 0C255 1/50 seconds 50 escape prompt delay s14 (1) bit mapped none aa hex general bit mapped options s16 bit mapped none 00 test mode bit mapped options (&t) s17 0C250 4 ms increments 00 fax mode null byte timer s18 (1) 0C255 seconds 00 test timer s19 0C1 none 00 conexant protocol interface speed s20 0C127 seconds 00 fax mode inactivity timer s21 (1) bit mapped none 00 general bit mapped options s22 (1) bit mapped none 76 hex general bit mapped options s23 (1) bit mapped none 07 general bit mapped options s24 0C255 seconds 00 sleep inactivity timer s25 (1) 0C255 0.1 or 1 seconds 05 delay to dtr off s26 (1) 0C255 0.01 seconds 1 rts-to-cts delay s27 (1) bit mapped none 40 hex general bit mapped options s28 (1) bit mapped none 00 general bit-mapped options note(s): (1) register value may be stored in one of two user profiles with the at&w command. RC224ATL/224atlv 5.0 s registers embeddedmodem family d224atlvdsc conexant 5-3 table 5-2. s register description (1 of 8) register default range units description s0 00 0C255 rings 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 0C255 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. s2 43 0C127 ascii 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). s3 13 0 C 127 ascii 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. s4 10 0 C 127 ascii 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. s5 08 0 C 32, 127 ascii 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 com- mand buffer is deleted. s6 02 2 C 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. s7 30 1 C 255 seconds 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. 5.0 s registers RC224ATL/224atlv embeddedmodem family 5-4 conexant d224atlvdsc s8 02 0 C 255 seconds 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. s9 06 1 C 255 1/10 seconds carrier detect response time. s9 sets the carrier detect response time. s10 14 1 C 255 1/10 seconds 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. s11 95 50 C 255 ms dtmf dialing speed. s11 sets the duration and inter-digit delay of the touch-tones. s12 50 0 C 255 1/50 seconds escape code guard time. s12 sets the escape code guard time. s13 reserved s14 aah bit mapped none 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 e0Cno echo 1e1 echo (factory default) bit 2 results code (see q command) 0q0 enabled (factory default) 1q1 disabled bit 3 verbose command (see v command) 0v0 digits 1v1 words (factory default) bit 4 reserved bit 5 (1) dial method (see t and p commands) 0t tone dial 1p pulse dial (factory default) bit 6 reserved bit 7 originate/answer (see a, d, and r commands, and register s0) 0answer 1 originate (factory default) s15 reserved table 5-2. s register description (2 of 8) register default range units description RC224ATL/224atlv 5.0 s registers embeddedmodem family d224atlvdsc conexant 5-5 s16 00 none 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 increments fax mode null byte timer. the value of s17 determines the 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 0C1 second (i.e., the timer value is the value of s17 times 4 ms). s18 00 0-255 seconds test tim er. 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. s19 not supported s20 0 1-127 seconds 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. table 5-2. s register description (3 of 8) register default range units description 5.0 s registers RC224ATL/224atlv embeddedmodem family 5-6 conexant d224atlvdsc s21 00 bit mapped 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 1 0 &d2Cmodem 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 table 5-2. s register description (4 of 8) register default range units description RC224ATL/224atlv 5.0 s registers embeddedmodem family d224atlvdsc conexant 5-7 s22 76h bit mapped 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) 654 000 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 100 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. 101 x2 selects appropriate connect result code, goes off-hook, and dials when dial tone is detected. busy is not detected. 110 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. 111 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 table 5-2. s register description (5 of 8) register default range units description 5.0 s registers RC224ATL/224atlv embeddedmodem family 5-8 conexant d224atlvdsc s23 07 bit mapped 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 0 0 300 bps 0 1 reserved 1 0 1200 bps 1 1 2400 bps (factory default) bit 3 reserved bit 4, 5 parity option 54 0 0 even parity (factory default) 0 1 space parity 10 odd parity 1 1 mark/none parity bit 6, 7 guard tones (see &g command) 76 00 &g0 guard tone disabled (factory default) 0 1 reserved 10 &g2 1800 hz guard tone 1 1 reserved s24 00 0-255 seconds 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 tab le 3 -5 .) s25 05 0-255 0.01 or 1 seconds 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. s26 01 0-255 0.01 seconds rts to cts delay intervals. reserved table 5-2. s register description (6 of 8) register default range units description RC224ATL/224atlv 5.0 s registers embeddedmodem family d224atlvdsc conexant 5-9 s27 40h bit mapped 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) 1 1 reserved bit 6 communications standard option (see b command) 0b0 ccitt v.22 bis/v.22 1b1 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) table 5-2. s register description (7 of 8) register default range units description 5.0 s registers RC224ATL/224atlv embeddedmodem family 5-10 conexant d224atlvdsc s28 00 bit mapped 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 010 pps 120 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. table 5-2. s register description (8 of 8) register default range units description d224atlvdsc conexant 6-1 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 . 6.1.2 data modem processing data modem processing is explicitly defined in ccitt v.22 bis, ccitt v.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. cts is on all the time and does not go off during handshake. 2. dsr is always on in parallel mode operation. 3. the rate change request option is not supported for v.22 bis. 4. v.22 operation supports only alternative b, mode ii (1200 bps asynchronous, 10 bit characters) table 6-1. data rate selection answer mode originate mode 300 1200 2400 300 300 1200 1200 1200 300 1200 1200 2400 300 1200 2400 6.0 operation RC224ATL/224atlv 6.1 data modes embeddedmodem family 6-2 conexant d224atlvdsc 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. RC224ATL/224atlv 6.0 operation embeddedmodem family 6.2 fax modes d224atlvdsc conexant 6-3 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.27 ter, and ccitt v.21 recommendations. all modulation, waveform spectrum, and data processing functions conform to the appropriate specifications with the following exceptions: 1. v.29 receive functions are not supported. 2. v.29 4800 bps is not supported; v.27 ter 4800 bps is used instead. 3. v.29 half-duplex continuous carrier mode only is supported. 4. v.29 channel multiplexer option is not supported. 5. v.27 ter 75-baud backward channel option is not supported. 6. v.27 ter short train mode is not supported. 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. 6.0 operation RC224ATL/224atlv 6.2 fax modes embeddedmodem family 6-4 conexant d224atlvdsc 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 x 16 + x 12 + x 5 + 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. RC224ATL/224atlv 6.0 operation embeddedmodem family 6.2 fax modes d224atlvdsc conexant 6-5 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: 1. if additional data is sent by the dte, the modem transmits another frame. 2. if the transmission is terminated by the 6.0 operation RC224ATL/224atlv 6.2 fax modes embeddedmodem family 6-6 conexant d224atlvdsc 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. the modem also identifies the end of a frame by inserting RC224ATL/224atlv 6.0 operation embeddedmodem family 6.3 fax enhanced flow control d224atlvdsc conexant 6-7 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.42 buffer sizes are shown below. buffer type size in bytes fax v.27/v.29 tx 255 (9600:212 ms) fax v.21 (hdlc) tx 255 (300:6.8 sec) rpi (hdlc) tx 238 (2400:793 ms) fax v.27 rx 223 (4800:371 ms) fax v.21 (hdlc) rx 255 (300:6.8 sec) 6.0 operation RC224ATL/224atlv 6.4 data/fax auto answering embeddedmodem family 6-8 conexant d224atlvdsc 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: 0C255; 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), RC224ATL/224atlv 6.0 operation embeddedmodem family 6.4 data/fax auto answering d224atlvdsc conexant 6-9 establish the appropriate connection, and inform the dte of the caller type with the following result codes: 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: 1. 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. 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. numeric verbose description 13 (0dh) data dce sends this result code only during auto answering or when dce has connected as a data modem. 15 (0fh) fax dce sends this result code only during auto answer mode when dce has connected as a fax modem. 6.0 operation RC224ATL/224atlv 6.4 data/fax auto answering embeddedmodem family 6-10 conexant d224atlvdsc 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. at&c1 ok dte commands dcd to follow data carrier. ats9=n ok dte defines the data mode connection time. at+faa=1 ok dte enables data/fax auto answer mode. dte sets the communication rate to the data modem rate (e.g., 2400 bps) prior to an incoming call . ring terminal is being called. ata 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. data dce indicates data modem connection is established. at commands ok dte optionally sends any commands to dce to restore conditions required by data modem communications package. ato connect 1200 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. callers data dte sends/receives data. caller hangs up. dte detects carrier loss and turns off dcd. no carrier 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. RC224ATL/224atlv 6.0 operation embeddedmodem family 6.4 data/fax auto answering d224atlvdsc conexant 6-11 table 6-3. terminal called by a fax machine dte command dce response comments assume dce in fax mode (fclass = 1), dte is running fax communication package, and dcd is off. at&c1 ok dte commands dcd to follow data carrier. ats9=n ok dte defines the data mode connection time. at+faa=1 ok dte enables data/fax auto answer mode. dte sets the communication rate to the data modem rate (e.g., 2400 bps) prior to an incoming call. ring terminal is being called. ata 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. fax dce switches to fax mode handshaking and sends fax message at the data modem rate (e.g., 2400 bps). dce sends 3 seconds of 2100 hz answer tone, enters v.21 transmit mode, and sends hdlc flags. connect dce ends connect response at the fax rate (i.e., 19,200 bps). 6.0 operation RC224ATL/224atlv 6.5 call progress embeddedmodem family 6-12 conexant d224atlvdsc 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 . fax answer tone detection requirements include 2100 and 1100 hz. the call progress detection requirements are identical to the lowband data signals identified above. table 6-4. tone characteristics tone cadence frequency (hz) dial tone continuous 350 + 440 old dial tone continuous 600+120/133 busy 0.5 sec on 0.5 sec off 480 + 620 480 + 620 old busy 0.5 sec on 0.5 sec off 600 + 120 600 + 120 precision reorder 0.3 sec on 0.2 sec off 480 + 620 480 + 620 old reorder (local) 0.25 sec on 0.25 sec off 600 + 120 600 + 120 old reorder (toll) 0.2 sec on 0.3 sec off 600 + 120 600 + 120 ringback 0.8-1.2 sec on 2.7-3.3 off 440 + 480 440 + 480 old ringback 2 sec on 4 sec off 420 + 40 420 + 40 double ringback 0.8 sec on 0.3 sec off 0.8 sec on 4 sec off 440 + 480 440 + 480 440 + 480 440 + 480 RC224ATL/224atlv 6.0 operation embeddedmodem family 6.5 call progress d224atlvdsc conexant 6-13 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 v rms 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) dce responses (modem) remote fax notes (1) at+fclass=1 (2) ok set to class 1 phase a (3) atdt6163 (4) dials (6) connect (5) answers (7) send hdlc flags +frh=3 implied by dialing phase b (8) send nsf frame (9) 6.0 operation RC224ATL/224atlv 6.5 call progress embeddedmodem family 6-14 conexant d224atlvdsc (30) ok, drop carrier (31) at+fts=8 (32) ok, wait 80 ms (33) at+ftm=96 (34) send f.29 (35) connect (36) RC224ATL/224atlv 6.0 operation embeddedmodem family 6.5 call progress d224atlvdsc conexant 6-15 table 6-6. fax class 1 answering sequence (1 of 2) dte commands (host) dce responses (modem) remote fax notes (1) at+fclass=1 (2) ok set to class 1 (2b) at+frm=? 24,48 ok phase a (3) fax machine dials (4) ring (5) ata (6) modem answers (7) send hdlc flags (8) receive flags +fth=3 implied by answering (9) connect phase b (10) 6.0 operation RC224ATL/224atlv 6.5 call progress embeddedmodem family 6-16 conexant d224atlvdsc phase c (44) at+frm-48 (45) send page data (46) d224atlvdsc conexant 7-1 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 w 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 specification operating temperature 0 c to + 70 c (32 f to 158 f) storage temperature C 55 c to + 125 c (C 67 f to + 257 f) relative humidity up to 90 % noncondensing, or a wet bulb temperature up to 35 c, whichever is less. 7.0 electrical/mechanical specifications RC224ATL/224atlv 7.3 interface timing and waveforms embeddedmodem family 7-2 conexant d224atlvdsc 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. timingChost bus interface symbol parameter min max units t as address setup 25 ns t ah address hold 0 ns t cs chip select setup 10 ns t ch chip select hold 0 ns t rd read strobe width 100 ns t dd delay hrd to data 75 ns t drh hrd to data hold 10 ns t wt write strobe width 75 ns t ds write data setup 30 ns t dwh write data hold 10 ns t df hrd to driver off 30 ns t dis hdis enable 40 ns t dih hdis hold 40 ns t inh interrupt hold 100 ns RC224ATL/224atlv 7.0 electrical/mechanical specifications embeddedmodem family 7.3 interface timing and waveforms d224atlvdsc conexant 7-3 figure 7-1. timing waveform t dd t dih t dis t rd t df t drh t as t cs t ch t ah ha0-ha2 hcs hrd hwt hd0-hd7 hdis a. host read t ds t wt t dwh t as t cs t ch t ah ha0-ha2 hcs hrd hwt hd0-hd7 hdis b. host write 7.0 electrical/mechanical specifications RC224ATL/224atlv 7.3 interface timing and waveforms embeddedmodem family 7-4 conexant d224atlvdsc table 7-3. current and power requirements mode current (id) power (pd) typical current @ 25c maximum current @ 0c typical power @ 25c maximum power @ 0c operating 20 ma 22 ma 100 mw 110 mw sleep - idle 5 ma 6 ma 25 mw 30 mw sleep - stop 1 ma 1 ma 5 mw 5 mw note(s): 1. test conditions: vdd = 5.0 v dc for typical values; vdd = 5.25 v dc for maximum values. 2. test conditions: vdd = 3.3 v dc for typical values; vdd = 3.6 v dc for maximum values. table 7-4. absolute maximum ratings parameter symbol limits units supply voltage v dd C 0.5 to + 7.0 v input voltage v in C 0.5 to vcc + 0.5 v analog inputs v in C 0.3 to + 5 vaa + 0.3 v voltage applied to outputs in high z state v hz C 0.5 to + 5 vdd + 0.5 v dc input clamp current i ik 20 ma dc output clamp current i ok 20 ma static discharge voltage (@ 25c) v esd 3000 v latch-up current (@ 25c) i trig 200 ma operating temperature range t a C 0 to + 70 c storage temperature range t stg C 40 to + 80 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. RC224ATL/224atlv 7.0 electrical/mechanical specifications embeddedmodem family 7.3 interface timing and waveforms d224atlvdsc conexant 7-5 table 7-5 lists digital interface characteristics, and table 7-6 lists analog interface characteristics. table 7-5. digital interface characteristics parameter symbol min. typ. max units test conditions (1) input high voltage type ia type dio type ih v ih 2.0 2.4 C 30 v cc v cc 30 v dc input low voltage type ia, ic, and do v il C 0.3 0.8 v dc input low voltage type if v il 38 v rms (2) input leakage current ia and ic i in 10 adc v in = 0 to v cc output high voltage type oa type od type og type oh v oh 2.4 5 8 v cc v cc v dc i load = -100 a i load = 0 ma output low voltage type oa type ob type od type og type oh v ol 0.5 C 8 0.75 C 5 0.4 0.4 v dc i load = 1.6 ma i load = 0.8 ma i load = 15 ma i load = 8 ma three-state (off) current i ts 25adcv in = 0.8 v to 4.5 v note(s): (1) RC224ATL test conditions: v cc = 5 v 5% , t a = 0c to 70c (unless otherwise stated). RC224ATLv test conditions: v cc = 3.3 v 5% , t a = 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. 7.0 electrical/mechanical specifications RC224ATL/224atlv 7.3 interface timing and waveforms embeddedmodem family 7-6 conexant d224atlvdsc 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. table 7-6. analog interface characteristics name type characteristic value rxa i (da) input impedance >50 k w voltage range 2.5 1.6 v txa1, txa2 o (dd) minimum load 300 w maximum capacitive load 0.01 f output impedance 10 w output voltage 2.5 1.6 v dc offset <200 mv (1) spkr o (df) minimum load 300 w maximum capacitive load 0.01 f output impedance 10 w output voltage 2.5 1.6 v dc offset <20 mv (1) note(s): (1) with reference to vc (2.5 v nominal). RC224ATL/224atlv 7.0 electrical/mechanical specifications embeddedmodem family 7.3 interface timing and waveforms d224atlvdsc conexant 7-7 figure 7-2. 68-pin plcc dd1 d2 d d1 d2 d d1 d3 index corner top view top view bottom view typ. for each axis (except for beveled edge) section a-a a a b e cham. h x 45 deg. 3 plcs cham. j x 45 deg. seating plane r1 r a a1 a2 a 7.0 electrical/mechanical specifications RC224ATL/224atlv 7.3 interface timing and waveforms embeddedmodem family 7-8 conexant d224atlvdsc table 7-7. 68-pin plcc dimensions dim millimeters inches min max min max a 4.14 4.39 0.163 0.173 a1 1.37 1.47 0.054 0.058 a2 2.31 2.46 0.091 0.097 b 0.457 typ 0.018 typ d 25.02 25.27 0.985 0.995 d1 24.00 24.26 0.945 0.955 d2 20.19 20.45 0.795 0.805 d3 23.24 23.5 0.915 0.925 e 1.27 bsc 0.050 bsc h 0.254 typ 0.010 typ j 1.15 typ 0.045 typ a 45 typ 45 typ r 0.89 typ 0.035 typ r1 0.254 typ 0.010 typ note(s): reference: pd68j/gp00-d164 RC224ATL/224atlv 7.0 electrical/mechanical specifications embeddedmodem family 7.3 interface timing and waveforms d224atlvdsc conexant 7-9 figure 7-3. 100-pin pqfp d d1 e1 d d1 top view side view detail a b a pin 1 ref see detail a cham. h x 45 deg. (4x) r1 r2 a a1 k1 a2 k2 k3 j 7.0 electrical/mechanical specifications RC224ATL/224atlv 7.3 interface timing and waveforms embeddedmodem family 7-10 conexant d224atlvdsc table 7-8. 100-pin pqfp dimensions dim millimeters inches min max min max a 1.95 2.05 0.077 0.081 a1 0.95 1.05 0.037 0.041 a2 0.15 0.25 0.006 0.010 d 22.96 23.44 0.904 0.923 d1 19.89 20.09 0.783 0.791 e 16.94 17.45 0.667 0.687 e1 13.89 14.10 0.547 0.555 k1 0.70 0.90 0.028 0.035 k2 0.40 0.016 k3 1.60 ref 0.083 ref r1 0.13 0.005 r2 0.15 0.25 0.008 0.010 a 0.60 0.70 0.024 0.028 b 0.26 0.36 0.010 0.014 h 0.25 0.010 j 0.13 0.17 0.005 0.007 note(s): reference: gp00-d234 d224atlvdsc conexant a-1 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. appendix a: rc224atf modem designs RC224ATL/224atlv a.1 68-pin plcc design for serial interface embeddedmodem family a-2 conexant d224atlvdsc figure a-1. serial interface design decoupling caps to v.24 eia-232-c interface transceivers to daa interface oh* txa2 txa1 rxa dtr* ri* cts* dsr* rxd* ci* dcd* txd* ring* vcc vcc vcc vcc vcc vcc c5 2200 pf r4 2.2k c10 .1 c11 .1 c13 10 16v ls1 161201 l1 47 c18 1000 pf c19 .1 f c6 22 10v c7 56 pf 5% c17 56 pf 5% y1 16.000312mhz 1 2 3 c14 .1 + - u6 lm386 2 3 5 6 1 4 8 7 u2 hy93c46j 3 5 2 8 4 6 7 1 cs di vcc nc sk do gnd nc c16 220 16v c15 .1 c12 .1 c22 .1 c9 12 10% 20v c21 .1 r17 4.7k u7 r6781-11 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 53 29 49 28 52 27 50 26 47 25 45 24 51 48 23 22 43 38 40 33 32 31 36 3 9 35 34 55 42 54 39 8 16 7 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 vc ring* a/a1* agcin rfilo sleep* sleepi* spkr agnd nvrdio nvrsk nvrcs r13 2k d6 r14 2k d7 r15 2k d8 r18 2k d9 r19 2k d10 r20 2k d11 r21 2k d12 r22 2k d13 r16 330k c8 .1 r12 100 RC224ATL/224atlv appendix a: rc224atf modem designs embeddedmodem family a.1 68-pin plcc design for serial interface d224atlvdsc conexant a-3 figure a-2. serial interface design daa oh* txa1 txa2 ring* rxa vcc vcc r1 18 1w rv1 v150la2 top j4 telco4/6 1 2 3 4 5 6 8 7 r2 7.5k 1w d1 1n970b d2 1n970b line t1 ttc143 k1 relay 1 4 2 3 c4 .01 d5 1n749a r3 100k r6 536 1% r9 1.5k d4 1n749a c20 .1 u1 4n35 6 4 5 1 3 2 d3 1n4148 r11 0 r10 0 c2 .001 10% 1kv c3 .47 10% 250v c1 .001 10% 1kv top j3 telco4/6 1 2 3 4 5 6 8 7 appendix a: rc224atf modem designs RC224ATL/224atlv a.1 68-pin plcc design for serial interface embeddedmodem family a-4 conexant d224atlvdsc table a-1. serial bill of materials (1 of 2) item quantity reference part 12c2,c1 0.001 2 1 c3 0.47 31c4 .01 4 1 c5 2200 pf 51c6 22 6 2 c7,c17 56 pf 7 9 c8,c10,c11,c12,c14,c15,c19, c20,c21 0.1 81c9 12 91c13 10 10 1 c16 220 11 1 c18 1000 pf 12 2 d1,d2 1n970b 13 1 d3 1n4148 14 2 d5,d4 1n749a 15 8 d6,d7,d8,d9,d10,d11,d12,d13 16 2 j4,j3 telco4/6 17 1 k1 relay 18 1 ls1 161201 19 1 l1 47 20 1 rv1 v150la2 21 1 r1 18 22 1 r2 7.5 k 23 1 r3 100 k 24 1 r4 2.2 k 25 1 r6 536 26 1 r9 1.5 k 27 2 r11,r10 0 28 1 r12 100 29 8 r13,r14,r15,r18,r19,r20,r21, r22 2 k RC224ATL/224atlv appendix a: rc224atf modem designs embeddedmodem family a.1 68-pin plcc design for serial interface d224atlvdsc conexant a-5 30 1 r16 330 k 31 1 r17 4.7 k 32 1 t1 ttc143 33 1 u1 4n35 34 1 u2 hy93c46j 35 1 u6 lm386 36 1 u7 r6781-11 37 1 y1 16.000312 mhz table a-1. serial bill of materials (2 of 2) item quantity reference part appendix a: rc224atf modem designs RC224ATL/224atlv a.2 68-pin plcc design for parallel interface embeddedmodem family a-6 conexant d224atlvdsc 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. RC224ATL/224atlv appendix a: rc224atf modem designs embeddedmodem family a.2 68-pin plcc design for parallel interface d224atlvdsc conexant a-7 figure a-3. parallel interface design decoupling caps to daa interface hcs* hdis oh* txa2 ring* hwt* hrd* ha0 ha1 ha2 reset* hint hd0 hd1 hd2 hd3 hd4 hd5 hd6 hd7 txa1 rxa vcc vcc vcc vcc vcc c5 2200 pf r4 2.2k c10 .1 c11 .1 c13 10 16v l1 47 c6 22 10v c 56pf 5% c1 56p 5% c14 .1 + - u6 lm386 2 3 5 6 1 4 8 7 u2 hy93c46j 3 5 2 8 4 6 7 1 cs di vcc nc sk do gnd nc c15 .1 c8 .1 c9 12 10% 20v c21 .1 r13 10k u7 r6781 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 53 29 49 28 52 27 50 26 47 25 45 24 51 48 23 22 43 38 40 33 32 31 36 3 9 35 34 55 42 54 56 19 13 7 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 vc ring* a/a1* agcin rfilo sleep* sleepi* spkr ph2 nvrdio nvrsk nvrcs c19 .1 f r12 100 c16 220 16v c18 1000 pf c12 .1 y1 16.000312mhz 1 2 3 ls1 161201 appendix a: rc224atf modem designs RC224ATL/224atlv a.2 68-pin plcc design for parallel interface embeddedmodem family a-8 conexant d224atlvdsc figure a-4. parallel interface design daa oh* txa1 txa2 ring* rxa vcc vcc r1 18 1w rv1 v150la2 top j4 telco4/6 1 2 3 4 5 6 8 7 r2 7.5k 1w d1 1n970b d2 1n970b line t1 ttc143 k1 relay 1 4 2 3 c4 .01 d5 1n749a r3 100k r6 536 1% r9 1.5k d4 1n749a c20 .1 u1 4n35 6 4 5 1 3 2 d3 1n4148 r11 0 r10 0 c2 .001 10% 1kv c3 .47 10% 250v c1 .001 10% 1kv top j3 telco4/6 1 2 3 4 5 6 8 7 RC224ATL/224atlv appendix a: rc224atf modem designs embeddedmodem family a.2 68-pin plcc design for parallel interface d224atlvdsc conexant a-9 table a-2. parallel billing materials (1 of 2) item quantity reference part 12c2,c1 0.001 2 1 c3 0.47 3 1 c4 0.01 4 1 c5 2200 pf 51c6 22 6 2 c7,c17 56 pf 7 8 c8,c10,c11,c12,c14,c15,c20, c21 0.1 81c9 12 91c13 10 10 1 c16 220 11 1 c18 1000 pf 12 1 c19 0.1 f 13 2 d1,d2 1n970b 14 1 d3 1n4148 15 2 d5,d4 1n749a 16 2 j4,j3 telco4/6 17 1 k1 relay 18 1 ls1 161201 19 1 l1 47 20 1 rv1 v150la2 21 1 r1 18 22 1 r2 7.5 k 23 1 r3 100 k 24 1 r4 2.2 k 25 1 r6 536 26 1 r9 1.5 k 27 2 r11,r10 0 28 1 r12 100 29 1 r13 10 k appendix a: rc224atf modem designs RC224ATL/224atlv a.2 68-pin plcc design for parallel interface embeddedmodem family a-10 conexant d224atlvdsc 30 1 t1 ttc143 31 1 u1 4n35 32 1 u2 hy93c46j 33 1 u6 lm386 34 1 u7 r6781 35 1 y1 16.000312 mhz table a-2. parallel billing materials (2 of 2) item quantity reference part d224atlvdsc conexant b-1 b appendix b: acronyms/abbreviations a-b agc automatic gain control at attention code c ccitt international telegraph and telephone consultative committee crc cyclic redundancy check cts clear to send d dac digital-to-analog converter dce data communication equipment dte host data terminal equipment dtmf dual-tone multifrequency dtr data terminal ready (name of bit and function) e-f eop end of process fcs frame check sequence i ier interrupt enable register iir interrupt identifier register l lcr line control register led light emitting diode lsr line status register appendix b : acronyms/abbreviations RC224ATL/224atlv embeddedmodem family b-2 conexant d224atlvdsc m mcr modem control register mcu microcontroller unit msr modem status register o-p oem original equipment manufacturer op amp operational amplifier pbx private branch exchange r-s rbr receiver buffer register rts request to send (name of bit and function) scr scratchpad register t- u thr transmit holding register ttl transistor-to-transistor logic uart universal asynchronous receiver/transmitter x x-on/x-off transistor on/off further information literature@c onexant.com 1-800-854-8099 (north america) 33-14-906-3980 (international) 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 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 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 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 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) 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