CONEXANT CX84200

Home Networking/Routers
Network Processors
Network Processor with
lntegrated Ethernet Switch
CX84200
Single-Chip Solution with Integrated
Five-Port Ethernet Switch
Conexant’s broadband communications portfolio includes a comprehensive
suite of semiconductor solutions that enable the digital home and
information network. The Conexant CX84200 Network Processor supports
complete networking system solutions for a wide variety of mainstream
applications in the residential and SOHO environments. Based on a 75 MHz
ARM7TDMI, this Network Processor is a single-chip solution with an
integrated switch that supports five 10/100 Mbps Ethernet ports.
In a Broadband Gateway application, the CX84200 Network Processor can
provide Internet access sharing capability for multiple PCs, while supporting
Ethernet, HomePNA (Phoneline), HomePlug (Powerline), IEEE 802.11 and other
LAN-side networking platforms. For WAN access, the unit supports Ethernet
connectivity interoperable with any broadband modem. It is the ideal platform
for a configurable broadband gateway design that needs to accommodate
many diverse WAN/LAN topologies.
The device complies with IEEE 802.3 specification and includes five
embedded DSP-based 10Base-T/100Base-TX transceivers. An auto negotiation
function determines the selection of either the 10Base-T or 100Base-TX mode.
Typical applications would be a Wireless Home Gateway including an Ethernet
WAN port to connect to a Broadband modem, four Ethernet LAN ports, and an
802.11b access connecting to any Wi-Fi compatible device.
Laptop
Laptop
Computer Computer
Personal
Computer
Personal
Computer
Personal
Computer
Personal
Computer
CX84200 Distinguishing Features
• Single-chip, high-performance
processor with five-port integrated
Ethernet switch
• Can be easily integrated with
various IEEE 802.11b solutions
• Supports HomePlug (Powerline)
and HomePNA (Phoneline) through
an M II interface
•••
Wireless
Clients
Ethernet (RJ45)
802.11a/b/g
Wireless Home Gateway
using the CX84200
Ethernet (RJ45)
Broadband Modem
Broadband Connection
Part Number CX84200
Internet
Network Server
Network Server
Wireless Home Gateway
Description
Network Processor with
Integrated Ethernet Switch
Home Networking/Routers
Network Processors
CX84200 Home Network Processor
Embedded
Software
Link Table
Embedded MC
Table
ARM7TDMI
32-Bit RISC Processor
Link Control/ BIST
Internal Memory Bus
Port 4
DMA
Port 3
DMA
Port 2
DMA
Port 1
DMA
Port 0
DMA
Port
DMA
Tx/Rx
MAC
Tx/Rx
MAC
Tx/Rx
MAC
Tx/Rx
MAC
Tx/Rx
MAC
Tx/Rx
MAC
10/100
PHY
10/100
PHY
10/100
PHY
10/100
PHY
10/100
PHY
AH Bus
Bridge
SRAM
Controller
SDRAM
Controller
Flash
SDRAM
MII
AP Bus
TP 0
TP 1
TP 2
TP 3
TP 4
SW-ARM
DMA
Configuration
MIB
Counters
UART0
I/F
UART1
I/F
UART1
Memory Control/ BIST
UART0
Embedded Software
Data Buffer/AddressTable
16K x 64
CX84200 Home Network Processor block diagram
CX84200 Features
• 5 Ethernet ports, 1 MII
• Embedded 10/100BaseT/TX PHY
• Embedded RISC CPU, 75MHZ ARM7TDMI





• Embedded switch engine
 - Store-and-forward operation
 - Non-blocking, full line speed capability
 - Full-duplex (IEEE802.3x) and half-duplex flow control
(Back pressure)
 - Two priorities CoS, set by port, VLAN tag, TCPIP TOS,
and customized type
 - 6 port grouping VLAN (overlappable)
 - MIB counters
 - Sharing dynamic data buffer management,
embedded SSRAM
 - MAC look-up table read/write-able
 - MAC address level security
 - Bandwidth control
 - Hashing scheme: direct-map or XOR
© 2002, Conexant Systems, Inc. All Rights Reserved. Conexant and the
Conexant logo are 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
subject to change without notice.
THIS MATERIAL IS PROVIDED AS IS AND WITHOUT
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NON-INFRINGEMENT.
02-0566
DSP based design
10BASE-T/100BASE-TX IEEE 802.3u Compliant
Digital Decision Feedback Equalizer
Integrated Baseline Wander Correction
3 LEDs provided per port
• Flash interface (512Kx8, 512Kx16 up to 1Mx16)
• SDRAM interface (1Mx16x2 up to 4Mx16x2)
• 2 UART interface, one for the modem interface
• GPIO pins
• LAN / WAN bandwidth prioritized
• Single 25MHz crystal input for network
• 2.5/3.3V, 0.25u CMOS process, 208-pin PQFP
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
Conexant shall not be liable for any
special, indirect, incidental or consequential damages as a result of its use.
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Order# 102089A