Home Networking/Routers
Network Processors
CX84200
Network Processor with
lntegrated Ethernet Switch
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 MII interface
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.
Part Number CX84200
Description Network Processor with
Integrated Ethernet Switch
Wireless Home Gateway
Personal
Computer
Laptop
Computer
Laptop
Computer
Wireless
Clients
Personal
Computer
Personal
Computer
Personal
Computer
Ethernet (RJ45)
802.11a/b/g
Wireless Home Gateway
using the CX84200
Broadband Modem
Ethernet (RJ45)
Broadband Connection
Network Server
Network Server
Internet
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.
Conexant shall not be liable for any
special, indirect, incidental or consequential damages as a result of its use.
02-0566
Home Networking/Routers
Network Processors
CX84200 Features
5 Ethernet ports, 1 MII
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
Embedded 10/100BaseT/TX PHY
- 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
Order# 102089A
CX84200 Home Network Processor block diagram
Internal Memory Bus
SW-ARM
DMA
SDRAM
Controller
SRAM
Controller
Port
DMA
Tx/Rx
MAC
M
I
I
Port 0
DMA
Tx/Rx
MAC
10/100
PHY
T
P
0
Port 1
DMA
Tx/Rx
MAC
10/100
PHY
T
P
1
Port 2
DMA
Tx/Rx
MAC
10/100
PHY
T
P
2
Port 3
DMA
Tx/Rx
MAC
10/100
PHY
T
P
3
S
D
R
A
M
F
l
a
s
h
AP Bus
AH Bus
Bridge
Configuration
MIB
Counters
UART0
I/F
UART1
I/F
ARM7TDMI
32-Bit RISC Processor
Embedded Software
Data Buffer/Address-
Table
16K x 64
Memory Control/ BIST
Embedded
Software
Link Table
Embedded MC
Table
Link Control/ BIST
CX84200 Home Network Processor
U
A
R
T
0
U
A
R
T
1
Port 4
DMA
Tx/Rx
MAC
10/100
PHY
T
P
4
PDF 
ZIP