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Introduction

The CONEXANT

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.

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

microcontroller. It is a hubless USB peripheral controller
that supports suspend/resume modes and
isochronous/non-isochronous transfers.

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.

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

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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.

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System Architecture

Hardware Interface

A system block diagram is shown in Figure 1.

The major interface signals are shown in Figure 2.

MD234F1 BD

TELEPHONE

LINE/

TELEPHONE

HANDSET/

AUDIO

INTERFACE

CIRCUIT

TELEPHONE
LINE

TEL HANDSET

MICROPHONE

HEADPHONE/
SPEAKER

MODEM DEVICE SET

MICRO

CONTROLLER

UNIT

(MCU)

[80-PIN PQFP]

(L2800)

MODEM

DATA PUMP

(MDP)

[100-PIN PQFP]

(R6764)

USB

CONTROLLER

UNIT

(UCU)

[68-PIN PLCC]

(R8292/

80931AA)

1M (128K x 8)

RAM

2M (256K x 8)

ROM/FLASH ROM

32K x 8

ROM

USB

INTERFACE

Figure 1. Block Diagram

MICRO

CONTROLLER

UNIT

(MCU)

MD234F2 IF

MODEM

DATA

PUMP
(MDP)

RS0-RS4

~CS

EXTERNAL

BUS

RIN

TXA1

TXA2

TELIN*

TELOUT*

SPKM

MICV*

MICM**

~RINGWAKE

~RLY1 (~OH)

~RLY2 (~VOICE)

~RLY3 (~MUTE)

~RLY4 (~CALLID)

~EXTOH

LCS

RINGD

VD3.3

CLKOUT

~WKRESOUT

DPIRQ

~READ

~WRITE

A0-A17

D0-D7

~DPSEL

~ROMSEL

~RAMSEL

~READ

~WRITE

A0-A4

D0-D7

~DPSEL

TELEPHONE

LINE

TELEPHONE

HANDSET

MICROPHONE

TELEPHONE

LINE/

TELEPHONE

HANDSET/

AUDIO

INTERFACE

CIRCUIT

HEADPHONE/

SPEAKER

~RES1
~RES2

2M (256K X 8)

ROM/

FLASH ROM

A0-A16

D0-D7

~READ

~WRITE

~RAMSEL

1M (128K X 8)

RAM

A0-A17

D0-D7

~READ

~WRITE

~ROMSEL

VGG

AVDD

VAA

DGND, AGND

SVCC (+5V)

VCC

~RESET

A0-A2

D0-D7

A0-A15

D0-D7

32K X 8

ROM

USB

CONTROLLER

UNIT

(UCU)

USB

A0-A15

D0-D7

~READ

D+

D-

VDD

SVCC (+5V)

DGND

CRYSTAL

CIRCUIT

XTAL1

XTAL2

SVCC

VDD

CLKIN

~WKRES

IRQ

CRYSTAL

CIRCUIT

XTLI

XTLO

* SP MODEL.

** NON-SP MODEL.

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#

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

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)

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

60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44

10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

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

Type

Description

ALE

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.

AVCC

PWR

Analog VCC. AVCC input for the phase locked loop circuitry.

DM0, DP0

I/O

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.

EA#

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.

ECAP

External Capacitor. Connect a 2.2 µF capacitor between this pin and VSS to ensure proper operation of the
differential line drivers.

FSSEL

Full Speed Select. Connect to VCC for 12MHz Xtal and 12Mbps full speed USB rate.

INT1#

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.

INT0#

RINGWAKE. Used to notify the host of an incoming ring in order to come out of suspend mode.

LED3:0

LED Drivers. Designed to drive LEDs connected directly to VCC. NC.

OVRI#/P3.0

Overcurrent Sense. Sense input to indicate an overcurrent condition on an external down-stream port.
Active low with an internal pullup. NC.

P0.7:0

I/O

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.

P1.7

I/O

NC. Quasi-bidirectional I/O port with internal pullup.

P1.6

Ready Indicate. Active low output to drive READY LED. Port has internal pullup.

P1.5

DCD Indicate. Active low output to drive DCD LED. Port has internal pullup.

P1.4

DATA Indicate. Active low output to drive DATA LED. Port has internal pullup.

P1.3

MODEMPWRCNTRL. Active low output used to control power supply to non-USB side of isolation. Port has
internal pullup.

P1.2

MDMRESET. Active low output used to reset the MCU and MDP. This port has an internal pullup.

P1.1

I/O

NC. Quasi-bidirectional I/O port with internal pullup.

P1.0

I/O

NC. Quasi-bidirectional I/O port with internal pullup.

P2.7:0

Address Lines. Eight-bit port with internal pullups used for upper byte of external memory address.

P3.5

I/O

NC. Quasi-bidirectional I/O port with internal pullup.

P3.4

I/O

NC. Quasi-bidirectional I/O port with internal pullup.

PLLSEL

Phase-locked Loop Select. Connect to VCC for 12MHz Xtal and 12Mbps full speed USB rate.

PSEN#

Program Store Enable. Read signal output. Asserted for read accesses to external program memory.

RD#

Read. Asserted for read accesses to external data memory.

RST

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.

SOF#/P3.1

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.

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USB General Operation

Descriptors

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

Field

Size

Value

Default

Description

bLength

Number

Size of this descriptor in bytes.

bDescriptorType

Constant

DEVICE Descriptor Type.

bcdUSB

BCD

0100

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.

bDeviceClass

Class

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.

bDeviceSubClass

SubClass

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

If the

bDeviceClass field is not set to 0xFF, all values are reserved

for assignment by USB.

bDeviceProtocol

Protocol

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.

bMaxPacketSize0

Number

Maximum packet size for endpoint zero (only 8, 16, 32, or 64 are
valid).

idVendor

1394

Vendor ID (assigned by USB).

idProduct

7470

Product ID (assigned by the manufacturer).

bcdDevice

BCD

0100

Device release number in binary-coded decimal.

iManufacturer

Index

Index of string descriptor describing manufacturer.

iProduct

Index

Index of string descriptor describing product.

iSerialNumber

Index

Index of string descriptor describing the device's serial number.

bNumConfigurations

Number

Number of possible configurations.

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Configuration Descriptor

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

Field

Size

Value

Default

Description

bLength

Number

Size of this descriptor in bytes.

bDescriptorType

Constant

CONFIGURATION.

wTotalLength

Number

002E

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.

bNumInterfaces

Number

Number of interfaces supported by this configuration.

bConfigurationValue

Number

Value to use as an argument to Set Configuration to select this
configuration.

iConfiguration

Index

Index of string descriptor describing this configuration.

bmAttributes

Bitmap

Configuration characteristics

Bus Powered

Self Powered

Remote Wakeup

D4..0 Reserved (reset to 0)

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.

MaxPower

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

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

Field

Size

Value

Default

Description

bLength

Number

Size of this descriptor in bytes.

bDescriptorType

Constant

INTERFACE Descriptor Type.

bInterfaceNumber

Number

Number of interface. Zero-based value identifying the index in the
array of concurrent interfaces supported by this configuration.

bAlternateSetting

Number

Value used to select alternate setting for the interface identified in
the prior field.

bNumEndpoints

Number

Number of endpoints used by this interface (excluding endpoint
zero). If this value is 0, this interface only uses endpoint zero.

bInterfaceClass

Class

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.

bInterfaceSubClass

SubClass

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.

bInterfaceProtocol

Protocol

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.

iInterface

Index

Index of string descriptor describing this interface.

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Endpoint Descriptor

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:

07058102100000

Bulk Out 1:

07050102100000

Bulk In 2:

07058203080064

Bulk Out 2:

07050202080000

Table 6. Endpoint Descriptors

Offset

Field

Size

Value

Description

bLength

Number

Size of this descriptor in bytes.

bDescriptorType

Constant

ENDPOINT Descriptor Type.

bEndpointAddress

Endpoint

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

IN endpoint

bmAttributes

Bit Map

This field describes the endpoint's attributes when it is configured using
the bConfigurationValue.

Bit 0..1: Transfer Type

Control

Isochronous

Bulk

Interrupt

All other bits are reserved

wMaxPacketSize

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.

bInterval

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

The R8292 enumeration process consists of the following steps:

1. Get device descriptor. The host requests and reads the device descriptor to determine maximum packet size.

2. Set address. The host sends the R8292's function address in a data packet using function endpoint 0. Device firmware

interprets this data.

3. 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.

4. 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.

5. Set configuration. The host assigns a configuration value to the device to establish the current configuration.

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

Transmit FIFO

Receive FIFO

USB Data Transfer Types

Function Endpoint 0

8 bytes

Control

Function Endpoint 1

16 bytes

Control, Interrupt, Bulk, Isochronous

Function Endpoint 2

8 bytes

Control, Interrupt, Bulk

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Design Considerations

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 D

and D

. 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 µF 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 0.1µF 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 µF 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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