© 2002, Conexant Systems, Inc. All Rights Reserved. Conexant and the Conexant

logo are registered trademarks of Conexant Systems, Inc. All other trademarks

are owned by their respective owners. Although Conexant strives for accuracy

in all its publications, this material may contain errors or omissions and is

ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING MERCHANTABILITY, FITNESS FOR A

PARTICULAR PURPOSE AND NON-INFRINGEMENT.

Conexant shall not be liable for any

special, indirect, incidental or consequential damages as a result of its use.

Broadband Modems

Cable Modems

02-0671

CX24951 Features

Cable PHY Downstream

• 10-bit A/D

• Direct IF sampling at 44 and 36 MHz

• QPSK/16/32/64/128/256 QAM demodulator

• Programmable equalization

• Annex A, B and C FEC

Cable PHY Upstream

• 11-bit D/A

• A-TDMA

• S-CDMA withTurboTrellis coding

• QPSK/8/16/32/64/128 QAM burst modulator

• Programmable pre-equalization

DMA Interrupt Controller

• 20 asynchronous channels

• Memory to memory moves: aligned/unaligned

• Source/destination mode for simple data transfer

• Circular/linked buffer support for inbound/outbound data

Peripheral I/O

• 32 GPIO

• JTAG boundary scan

• UART

Cable MAC Network Processor

• Software Programmable

- DOCSIS 2.0/1.1/1.0 compliant

- EuroDOCSIS 2.0/1.1/1.0 compliant

- DVB compliant

- Fixed wireless compliant

- Proprietary standards

• Two PHS engines

• Internal 64KB data memory

• Internal 128KB Instruction memory

• Three 56-bit DES/CRC engines

• PID, SID, DA/SA, MAC, IP and LLC filtering

Application Network Processor

• ARM940T microcontroller

• Up to 225 MHz operation

• 4KB instruction and 4KB data cache

• Embedded ICE and debug extensions

• HCS 16- and 32-bit CRC single-cycle engines

MII

• IEEE 802.3 MAC layer

• Networking technologies

- 10/100 Ethernet

- Conexant HPNA 2.0

- Conexant HomePlug 1.0

Host Interface

• Master mode

- 16-bit data

- 8-chip selects

• Supports Flash, IP telephony, PCMCIA

- IEEE 802.11a or IEEE 802.11b

- 16/32-bit Slave mode (external host and test)

USB 1.1

• Integrated 12 Mb transceiver

• Communications peripheral device

Memory

• Internal 8K x 32 SRAM

• External SDRAM Interface

- 16-bit interface

- Supports both 4MB and 8MB technologies

Phase-Locked Loops (4)

• TDM clock and frame sync generator

• Transmit clock generator

• Supplied 25MHz Ethernet reference clock

• Internal USB clock

Miscellaneous Functions

• Watchdog timer

• Four additional timers

• Interrupt controller

Package and Power

• 228 PBGA (17mm x 17mm)

• All I/O at 3.3V

• Power supply: 3.3V and 1.3V

• <550 mW (typical)

Reference Designs

• DOCSIS 2.0/1.1/1.0

• EuroDOCSIS 2.0/1.1/1.0

• PCI

Product Applications

(DOCSIS/EuroDOCSIS 2.0/1.1/1.0, DVB, Proprietary)

• Cable Modems with Ethernet

• Cable Modems with USB

• Cable Modems with IPTelephony

• PCI Cable Modem Card Internal (CMCI)

• Cable Modem with Home Networking

• PCMCIA Cable Modem

• Digital Set-Top Box with Cable Modem

• CPE Controlled Cable Modem (CCCM)

www.conexant.com

General Information:

U.S. and Canada: (800) 854-8099

International: (949) 483-6996

Headquarters – Newport Beach

4311 Jamboree Rd, P.O. Box C

Newport Beach, CA 92660-3095

Order# 102113A