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Introduction
The CONEXANTTM RC56D Modem Device Set supports the USB (Universal Serial Bus), as described by the Universal Serial Bus Specification Revision 1.0. USB provides a flexible interconnect between a PC and a wide range of peripherals, such as to a CONEXANT modem device set. The CONEXANT RC56D family devices, in conjunction with the R8292 USB controller provide a complete USB modem solution. The supported modem feature set for the USB modem solution is the same as the standard RC56D parallel host interface device set (see "RC56D and RC336D Integrated V.90/K56flex/V.34 Modem Device Set for Desktop Applications" Data Sheet, Order No. MD211). The modem models, which include the R8292 UCU (USB Controller Unit in 68-PLCC), are listed in Table 1.
Features
* * * * * * * * * * * * * * * * * All features supported by the RC56D family (see data sheet Order No. MD211) Universal Serial Bus Specification Rev 1.0 compliant Three function endpoint pairs with corresponding transmit/receive FIFO pairs Automatic transmit/receive FIFO management USB full speed 12Mbps USB low speed 1.5Mbps Reset separation Four LED driver outputs On-chip phase-locked loop (PLL) On-chip USB transceivers 256 bytes on-chip Data RAM Suspend/Resume Vendor specific descriptors Windows 98 support Windows 95 OSR 2.1 support Extension pickup/remote hang-up detection Line-in-use detection
Hardware
A complete accelerator kit implementing the USB solution is offered as "Perth" (AK56-D540). This design consists of the RC56D parallel host interface device set and the R8292 USB Controller Unit (UCU). The R8292 operates with a 12 MHz crystal. A 32K x 8, 150 ns EEPROM is required for USB controller firmware. Additionally, one latch, one transistor, and two bus transceivers are required. The R8292 USB Controller is based on the MCS 51 microcontroller. It is a hubless USB peripheral controller that supports suspend/resume modes and isochronous/non-isochronous transfers.
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Firmware
Firmware for the R8292 controller is provided in object form, however, vendor specific descriptors can be customized with a supplied utility. Vendor ID, Product ID, Device Release Number, Manufacturer Name, Product Name, and Serial Number can all be modified.
Drivers
A complete set of software drivers is provided for Windows 98 and Windows 95 OSR 2.1 support. Sample INF files are also provided.
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Table 1. Modem Models and Functions
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Information provided by CONEXANT SYSTEMS, INC. is believed to be accurate and reliable. However, no responsibility is assumed by CONEXANT for its use, nor any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of CONEXANT other than for circuitry embodied in CONEXANT products. CONEXANT reserves the right to change circuitry at any time without notice. This document is subject to change without notice.
K56flex is a trademark of CONEXANT SYSTEMS, INC. and Lucent Technologies. CONEXANT, "What's Next in Communications Technologies", MNP 10EC, and ConfigurACE are trademarks of CONEXANT SYSTEMS, INC. MNP is a trademark of Compaq Computer Corporation. MCS is a registered trademark of Intel Corporation.
(c)1998, CONEXANT SYSTEMS, INC. Printed in U.S.A. All Rights Reserved
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,QWHJUDWHG9.IOH[0RGHP'HYLFH6HWVZLWK86%,QWHUIDFH System Architecture
Hardware Interface
A system block diagram is shown in Figure 1. The major interface signals are shown in Figure 2.
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MODEM DEVICE SET
TELEPHONE LINE TEL HANDSET HEADPHONE/ SPEAKER MICROPHONE
USB INTERFACE
USB CONTROLLER UNIT (UCU) [68-PIN PLCC] (R8292/ 80931AA)
MICRO CONTROLLER UNIT (MCU) [80-PIN PQFP] (L2800)
MODEM DATA PUMP (MDP) [100-PIN PQFP] (R6764)
TELEPHONE LINE/ TELEPHONE HANDSET/ AUDIO INTERFACE CIRCUIT
32K x 8 ROM
1M (128K x 8) RAM
2M (256K x 8) ROM/FLASH ROM
MD234F1 BD
Figure 1. Block Diagram
~RINGWAKE ~RLY1 (~OH) ~RLY2 (~VOICE)
XTAL1 CRYSTAL CIRCUIT XTAL2 CRYSTAL CIRCUIT XTLI XTLO
~RLY3 (~MUTE) ~RLY4 (~CALLID) ~EXTOH LCS
TELEPHONE LINE TELEPHONE LINE/ TELEPHONE HANDSET/ AUDIO INTERFACE CIRCUIT
VCC
RINGD
VD3.3 SVCC CLKOUT ~WKRESOUT DPIRQ D+ USB DUSB CONTROLLER UNIT (UCU) A0-A15 D0-D7 A0-A2 D0-D7 MICRO CONTROLLER UNIT (MCU) ~READ ~WRITE A0-A17 D0-D7 ~DPSEL ~ROMSEL ~RAMSEL DGND, AGND ~READ ~WRITE A0-A4 D0-D7
TELEPHONE HANDSET MICROPHONE HEADPHONE/ SPEAKER
VDD CLKIN ~WKRES IRQ MODEM DATA PUMP (MDP) RS0-RS4
RIN TXA1 TXA2
TELIN* TELOUT* SPKM MICV* MICM**
~DPSEL
~CS ~RES1 ~RES2 VGG AVDD VAA ~RESET
SVCC (+5V) SVCC (+5V) SVCC (+5V)
A0-A17 SVCC (+5V) VDD ~WRITE DGND ~ROMSEL A0-A16 D0-D7 A0-A15 D0-D7 ~READ 32K X 8 ~READ ~WRITE ~RAMSEL MD234F2 IF 1M (128K X 8) * SP MODEL. ** NON-SP MODEL. EXTERNAL BUS D0-D7 ~READ 2M (256K X 8) ROM/ FLASH ROM
RAM
ROM
Figure 2. Hardware Interface Signals
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R8292 Signal Pin Assignments and Descriptions
The R8292 68-pin PLCC signal pin assignments are shown in Figure 3. The R8292 68-pin PLCC signals are described in Table 2.
P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0 VSS VCC P3.0 P3.1/SOF# P3.2/INT0# P3.3/INT1# P3.4 P3.5 WR#
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
9 8 7 6 5 4 3 2 1 68 67 66 65 64 63 62 61
P2.0 P2.1 P2.2 P2.3 P2.4 P2.5 P2.6 P2.7 VSS VCCP EA# ALE PSEN# FSSEL VSSP Reserved (NC) Reserved (NC)
60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44
Reserved (NC) Reserved (NC) Reserved (NC) Reserved (NC) VCC DP0 DM0 ECAP VSSP VCCP VSS Reserved (NC) Reserved (NC) VSSP Reserved (NC) Reserved (NC) LED0
RD# P1.0/T2 P1.1/T2EX P1.2 P1.3 P1.4 P1.5 P1.6 P1.7 LED3 LED2 XTAL1 XTAL2 AVCC RST PLLSEL LED1
MD234F3 PO R8292 68PLCC
Figure 3. R8292 68-Pin PLCC Pin Signals
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Table 2. R8292 68-Pin PLCC Pin Signal Descriptions
Signal Name ALE O Type Description
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Address Latch Enable. ALE signals the start of an external bus cycle and indicates that valid address information is available on lines A15:8 and AD7:0. An external latch can use ALE to demultiplex the address from the address/data bus. Analog VCC. AVCC input for the phase locked loop circuitry. USB Port 0. DP0 and DM0 are the differential data plus and data minus signals of USB port 0, the upstream differential port. These lines do not have internal pullup resistors. Provide an external 1.5 K pullup resistor at DP0. If DP0 is not pulled high, a continuous SEO (USB reset) will be applied to these inputs causing the 8x931 to stay in reset. External Access. Directs program memory accesses to on-chip or off-chip code memory. For EA# strapped to ground, all program memory accesses are off-chip. For EA# strapped to VCC , program accesses on-chip ROM if the address is within the range of the on-chip ROM; otherwise the access is off-chip. The value of EA# is latched at reset. For devices without on-chip ROM, EA# must be strapped to ground. External Capacitor. Connect a 2.2 F capacitor between this pin and VSS to ensure proper operation of the differential line drivers. Full Speed Select. Connect to VCC for 12MHz Xtal and 12Mbps full speed USB rate. HINT. Host bus interrupt input is set high by MCU when the MCU receiver error flag, received data available, transmitter holding register empty, or modem status interrupt is asserted. RINGWAKE. Used to notify the host of an incoming ring in order to come out of suspend mode. LED Drivers. Designed to drive LEDs connected directly to VCC. NC. Overcurrent Sense. Sense input to indicate an overcurrent condition on an external down-stream port. Active low with an internal pullup. NC. Address/Data Lines. Eight-bit, open-drain, bidirectional I/O lines with Schmitt trigger inputs that represent lower byte of external memory address multiplexed with data. NC. Quasi-bidirectional I/O port with internal pullup. Ready Indicate. Active low output to drive READY LED. Port has internal pullup. DCD Indicate. Active low output to drive DCD LED. Port has internal pullup. DATA Indicate. Active low output to drive DATA LED. Port has internal pullup. MODEMPWRCNTRL. Active low output used to control power supply to non-USB side of isolation. Port has internal pullup. MDMRESET. Active low output used to reset the MCU and MDP. This port has an internal pullup. NC. Quasi-bidirectional I/O port with internal pullup. NC. Quasi-bidirectional I/O port with internal pullup. Address Lines. Eight-bit port with internal pullups used for upper byte of external memory address. NC. Quasi-bidirectional I/O port with internal pullup. NC. Quasi-bidirectional I/O port with internal pullup. Phase-locked Loop Select. Connect to VCC for 12MHz Xtal and 12Mbps full speed USB rate. Program Store Enable. Read signal output. Asserted for read accesses to external program memory. Read. Asserted for read accesses to external data memory. Reset. Reset input to the chip. Holding this pin high for 64 oscillator periods while the oscillator is running resets the device. The port pins are driven to their reset conditions when a voltage greater than VIH1 is applied, whether or not the oscillator is running. This pin has an internal pulldown resistor which allows the device to be reset by connecting a capacitor between this pin and VCC. Asserting RST when the chip is in idle mode or powerdown mode returns the chip to normal operation. Start of Frame. Start of frame pulse. Active low. Asserted for 8 states when frame timer is locked to USB frame timing and SOF token or artificial SOF is detected. NC.
AVCC DM0, DP0
PWR I/O
EA#
I
ECAP FSSEL INT1# INT0# LED3:0 OVRI#/P3.0 P0.7:0 P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0 P2.7:0 P3.5 P3.4 PLLSEL PSEN# RD# RST
I I I I O I I/O I/O O O O O O I/O I/O O I/O I/O I O O I
SOF#/P3.1
O
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Table 2. R8292 68-Pin PLCC Pin Signal Descriptions (Cont'd)
Signal Name VCC VSS WR# XTAL1 XTAL2
Type PWR GND O I O Circuit Ground. Connect this pin to ground. Write. Write signal output to external memory.
Description Supply Voltage. Connect this pin to the +5v supply voltage.
Oscillator Amplifier Input. When implementing the on-chip oscillator, connect the external crystal or ceramic resonator across XTAL1 and XTAL2. If an external clock source is used, connect it to this pin. Oscillator Amplifier Output. When implementing the on-chip oscillator, connect the external crystal or ceramic resonator across XTAL1 and XTAL2. If an external oscillator is used, leave XTAL2 unconnected.
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Descriptors
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USB devices report their attributes using descriptors. A descriptor is a data structure with a defined format, which begins with a byte-wide field that contains the total number of bytes in the descriptor followed by a byte-wide field that identifies the descriptor type. Class and vendor specific descriptors may be returned in one of two ways. Class and vendor specific descriptors that are related to standard descriptors are returned in the same data buffer as the standard descriptor. If a class or vendor specific descriptor is not related to a standard descriptor, it is returned using class or vendor specific requests. Device Descriptor A device descriptor describes general information about a USB device, which applies globally to the device and all of the device's configurations (see Table 3). A USB device has only one device descriptor. Vendor ID, Product ID, and Device Release Number can be changed. The Manufacturer Name, Product Name, and Serial Number can also be customized.
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Table 3. Device Descriptors
Offset 0 1 2
Field
Size 1 1 2
Value Number Constant BCD
Default 12 01 0100 DEVICE Descriptor Type.
Description Size of this descriptor in bytes. USB Specification Release Number in Binary-Coded Decimal (i.e., 2.10 is 0x210). This field identifies the release of the USB Specification that the device and its descriptors are compliant with. Class code (assigned by USB). If this field is reset to 0, each interface within a configuration specifies its own class information and the various interfaces operate independently. If this field is set to a value between 1 and 0xFE, the device supports different class specifications on different interfaces and the interfaces may not operate independently. This value identifies the class definition used for the aggregate interfaces. (For example, a CD-ROM device with audio and digital data interfaces that require transport control to eject CDs or start them spinning.) If this field is set to 0xFF, the device class is vendor specific.
bLength bDescriptorType bcdUSB
4
bDeviceClass
1
Class
00
5
bDeviceSubClass
1
SubClass
00
Subclass code (assigned by USB). These codes are qualified by the value of the bDeviceClass field. If the bDeviceClass field is reset to 0, this field must also be reset to 0. If the bDeviceClass field is not set to 0xFF, all values are reserved for assignment by USB.
6
bDeviceProtocol
1
Protocol
00
Protocol code (assigned by USB). These codes are qualified by the value of the bDeviceClass and the bDeviceSubClass fields. If a device supports class-specific protocols on a device basis as opposed to an interface basis, this code identifies the protocols that the device uses as defined by the specification of the device class. If this field is reset to 0, the device does not use class specific protocols on a device basis. However, it may use class specific protocols on an interface basis. If this field is set to 0xFF, the device uses a vendor specific protocol on a device basis.
7 8 10 12 14 15 16 17
bMaxPacketSize0 idVendor idProduct bcdDevice iManufacturer iProduct iSerialNumber bNumConfigurations
1 2 2 2 1 1 1 1
Number ID ID BCD Index Index Index Number
08 1394 7470 0100 01 02 03 02
Maximum packet size for endpoint zero (only 8, 16, 32, or 64 are valid). Vendor ID (assigned by USB). Product ID (assigned by the manufacturer). Device release number in binary-coded decimal. Index of string descriptor describing manufacturer. Index of string descriptor describing product. Index of string descriptor describing the device's serial number. Number of possible configurations.
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Configuration Descriptor
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A configuration descriptor describes information about a specific device configuration (see Table 4). The descriptor describes the number of interfaces provided by the configuration. Table 4. Configuration Descriptors
Offset 0 1 2 Field Size 1 1 2 Value Number Constant Number Default 09 02 002E CONFIGURATION. Total length of data returned for this configuration. Includes the combined length of all descriptors (configuration, interface, endpoint, and class or vendor specific) returned for this configuration. Number of interfaces supported by this configuration. Value to use as an argument to Set Configuration to select this configuration. Index of string descriptor describing this configuration. Configuration characteristics D7 D6 D5 D4..0 Bus Powered Self Powered Remote Wakeup Reserved (reset to 0) Description Size of this descriptor in bytes.
bLength bDescriptorType wTotalLength
4 5 6 7
bNumInterfaces bConfigurationValue iConfiguration bmAttributes
1 1 1 1
Number Number Index Bitmap
01 01 00 A0
A device configuration that uses power from the bus and a local source sets both D7 and D6. The actual power source at runtime may be determined using the Get Status device request. If a device configuration supports remote wakeup, D5 is set to 1. 8
MaxPower
1
mA
C8
Maximum power consumption of USB device from the bus in this specific configuration when the device is fully operational. Expressed in 2 mA units (i.e., 50 = 100 mA). Note: A device configuration reports whether the configuration is bus-powered or self-powered. Device status reports whether the device is currently self-powered. If a device is disconnected from its external power source, it updates device status to indicate that it is no longer self-powered. A device may not increase its power draw from the bus, when it loses its external power source, beyond the amount reported by its configuration. If a device can continue to operate when disconnected from its external power source, it continues to do so. If the device cannot continue to operate, it fails operations it can no longer support. Host software may determine the cause of the failure by checking the status and noting the loss of the device's power source.
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Interface Descriptor
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An interface descriptor describes a specific interface provided by the associated configuration (see Table 5). It is always returned as part of a configuration descriptor. An interface descriptor never includes endpoint zero in the number of endpoints. Table 5. Interface Descriptors
Offset 0 1 2 3 4 5 Field Size 1 1 1 1 1 1 Value Number Constant Number Number Number Class Default 09 04 00 00 04 00 Description Size of this descriptor in bytes. INTERFACE Descriptor Type. Number of interface. Zero-based value identifying the index in the array of concurrent interfaces supported by this configuration. Value used to select alternate setting for the interface identified in the prior field. Number of endpoints used by this interface (excluding endpoint zero). If this value is 0, this interface only uses endpoint zero. Class code (assigned by USB). If this field is reset to 0, the interface does not belong to any USB specified device class. If this field is set to 0xFF, the interface class is vendor specific. All other values are reserved for assignment by USB. 6
bLength bDescriptorType bInterfaceNumber bAlternateSetting bNumEndpoints bInterfaceClass
bInterfaceSubClass
1
SubClass
00
Subclass code (assigned by USB). These codes are qualified by the value of the bInterfaceClass field. If the bInterfaceClass field is reset to 0, this field must also be reset to 0. If the bInterfaceClass field is not set to 0xFF, all values are reserved for assignment by USB.
7
bInterfaceProtocol
1
Protocol
00
Protocol code (assigned by USB). These codes are qualified by the value of the bInterfaceClass and the bInterfaceSubClass fields. If an interface supports class-specific requests, this code identifies the protocols that the device uses as defined by the specification of the device class. If this field is reset to 0, the device does not use a class specific protocol on this interface. If this field is set to 0xFF, the device uses a vendor specific protocol for this interface.
8
iInterface
1
Index
00
Index of string descriptor describing this interface.
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Endpoint Descriptor
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Each endpoint used for an interface has its own descriptor, which contains the information required by the host to determine the bandwidth requirements of each endpoint (see Table 6). An endpoint descriptor, like an Interface Descriptor, is always returned as part of a configuration descriptor. The default values are: Bulk In 1: Bulk Out 1: Bulk In 2: Bulk Out 2: 07058102100000 07050102100000 07058203080064 07050202080000 Table 6. Endpoint Descriptors
Offset 0 1 2 Field Size 1 1 1 Value Number Constant Endpoint ENDPOINT Descriptor Type. The address of the endpoint on the USB device described by this descriptor. The address is encoded as follows: Bit 0..3: The endpoint number Bit 4..6: Reserved, reset to 0 Bit 7: Direction, ignored for control endpoints 0 OUT endpoint 1 IN endpoint 3 Description Size of this descriptor in bytes.
bLength bDescriptorType bEndpointAddress
bmAttributes
1
Bit Map
This field describes the endpoint's attributes when it is configured using the bConfigurationValue. Bit 0..1: Transfer Type 00 Control 01 Isochronous 10 Bulk 11 Interrupt All other bits are reserved
4
wMaxPacketSize
2
Number
Maximum packet size this endpoint is capable of sending or receiving when this configuration is selected. For isochronous endpoints, this value is used to reserve the bus time in the schedule, required for the per frame data payloads. The pipe may, on an ongoing basis, actually use less bandwidth than that reserved. The device reports, if necessary, the actual bandwidth used via its normal, non-USB defined mechanisms. For interrupt, bulk, and control endpoints smaller data payloads may be sent, but will terminate the transfer and may or may not require intervention to restart. Refer to Chapter 5 for more information.
6
bInterval
1
Number
Interval for polling endpoint for data transfers. Expressed in milliseconds. This field is ignored for bulk and control endpoints. For isochronous endpoints this field must be set to 1. For interrupt endpoints, this field may range from 1 to 255.
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Enumeration
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The R8292 enumeration process consists of the following steps: 1. 2. 3. 4. Get device descriptor. The host requests and reads the device descriptor to determine maximum packet size. Set address. The host sends the R8292's function address in a data packet using function endpoint 0. Device firmware interprets this data. Get device descriptor. The host requests and reads the device descriptor to determine such information as device class, USB Specification compliance level, maximum packet size for endpoint 0, vendor id, product id. Etc. Get configuration descriptor. The host requests and reads the device configuration descriptor to determine such information as the number of interfaces and endpoints; endpoint transfer type, packet size, and direction; power source ;maximum power; etc. When the host requests the configuration descriptor, all related interface and endpoint descriptors are returned. Set configuration. The host assigns a configuration value to the device to establish the current configuration.
5.
Endpoint Pairs Data transfers with the host are made to/from endpoint pairs on the USB module. The R8292 provides three function endpoint pairs as follows. Table 7. Endpoint Pairs Endpoint Pair Function Endpoint 0 Function Endpoint 1 Function Endpoint 2 Transmit FIFO 8 bytes 16 bytes 8 bytes Receive FIFO 8 bytes 16 bytes 8 bytes USB Data Transfer Types Control Control, Interrupt, Bulk, Isochronous Control, Interrupt, Bulk
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In addition to the design considerations found in the RC56D/RC336D Designer's Guide (Order No. 1154), the following should be taken into account when designing a USB solution.
Series Resistor Requirement for Impedance Matching
Per USB rev. 1.0 specification, the impedance of the differential driver must be between 29 and 33 should be connected to each USB line; i.e., on DP0 and DM0. If the USB line is improperly terminated or not matched, then signal quality will suffer. This condition can be seen on an oscilloscope as excessive overshoot and undershoot, and will introduce errors and lower throughput.
Pullup Resistor Requirement
The USB specification requires a pullup resistor to allow the host to identify which devices are low speed and which devices are high speed in order to communicate at the appropriate data rate. For R8292, add a 1.5K pullup to 3.0V - 3.6V, such as pin 53 (ECAP). These pullup resistors should be placed as close to the R8292 as possible. If ECAP is used, a 1 F capacitor should be connected between ECAP and GND.
Noise Considerations
The R8292 high-speed logic can produce noise spikes on power and signal lines. Decoupling capacitors and transient absorbers will keep noise to a minimum. Connect 0.1F bypass caps between VCC/AVCC and each VSS pin. Noise spikes on XTAL1 and XTAL2 can disrupt the timing of the R8292. Place the crystal and capacitors near the device and connect with short, direct traces. This will help minimize coupling between other digital circuits and the crystal. Additionally, place guard rings around the oscillator circuitry and ground the metal crystal case.
Power-on Reset
To automatically generate a reset when power is applied, connect the RST pin to VCC through a 0.33 F capacitor. When VCC is applied, the RST pin rises to VCC, and does not decay below the threshold before the crystal stabilizes, plus two machine cycles.
Excessive LED Current
Pins LED3:0 (36, 37, 43, 44) were designed to drive LEDs connected directly to VCC. The LED driver is too strong, causing the device to sink excessive current. When all of the LED drivers are turned on at the same time, the current sinking capability of the device will be exceeded, causing excessive heating and reducing reliability of the device. By using a 250 resistor in series with each LED, to avoid this problem.
Electrical Characteristics and Timing
For R8292 electrical characteristics and timing information, refer to Intel "8x931AA/8x931HA Universal Serial Bus Peripheral Controllers", Order Number: 273108-002. R8292 power consumption is 70 mA active and 40 mA idle.
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Price & Availability of RC56D-USB

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