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L2800

Integrated V.90/K56flex Modem Device Sets with USB Interface for Desktop Applications

Conexant Systems 

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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®51

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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