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CX20441-11

AccessRunner™ ADSL-USB Modem Device Set

Conexant Systems 

AccessRunner ADSL-USB Modem Device Set Data Sheet

ARM Processor

SDRAM

or SRAM

EEPROM

USB

RAM

ROM

Host

Interface

External

Memory

Controller

(EMC)

EEPROM

Interface

USB

Interface

Control Logic

GPIO

ADSL

Interface

Figure 2-1. P5200 UIC Block Diagram

ADSL

Data Pump

and AFE

100427 F2-1_BD_P5200

Host Interface

The Host Interface is a 16-bit data and 21-bit address bus used for control of the ADSL Data Pump.

ADSL Interface

The ADSL Interface is responsible for data transfer to and from the ADSL Data Pump and the setup of the AFE.

USB Interface

The USB Interface is responsible for data transfer to and from the USB, by extracting clock and data from the USB cable. It

also handles the front end functions of the USB protocol such as Sync Field Identification, NRZI-NRZ Conversion, Bit

Stripping and Stuffing, and CRC functions. Additionally, the USB port converts the serial packet to 8-bit parallel data. Control

transfers addressed to End Point Zero are handled by the USB port.

LED Interface

GPIO are used to support the following LED signals: Power, Ready, Showtime, TXD, and RXD.

EEPROM Interface

A 2-wire serial EEPROM is used to store USB device, configuration, interface, and endpoint descriptors. Device descriptors

include Vendor ID, Product ID, Device Release Number, Manufacturer Name, Product Name, and Serial Number. Both 4196

bit and 2048 bit EEPROMs are supported. The EEPROM speed must be capable of 400 kHz clock frequency.

A typical 4196 bit (512 x 8) EEPROM that meets P5200 UIC requirements is the Fairchild M24C04M8 or equivalent.

A typical 2048 bit (256 x 8) EEPROM that meets P5200 UIC requirements is the Fairchild M24C02M8 or equivalent.

General Purpose Input/Output Interface

Most General Purpose Input/Output (GPIO) pins are programmed for dedicated system functions or reserved for test or

growth functions and are not available for user assignment. Each GPIO pin is controlled individually for input/output direction.

All GPIO pins can serve as external interrupt inputs.

100427B

Conexant

2-3

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