參數(shù)資料
型號(hào)： MEA224AG
廠商： CONEXANT SYSTEMS
元件分類： 微控制器/微處理器
英文描述： 4 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PBGA352
封裝： 35 X 35 MM, 2.33 MM HEIGHT, PLASTIC, MS-034, BGA-352
文件頁(yè)數(shù)： 12/29頁(yè)
文件大?。?/td> 519K
代理商： MEA224AG
1997 Zarlink Semiconductor Inc.
Page:
1
Rev. 4.0 –December, 1997
P REL IM INARY
DAT A
SH EET
EA-224 – 4-Port Fast Ethernet Access Controller
(XpressFlow
TM 2001 Series 10/100 Ethernet Switch Chipset)
1. DISTINCTIVE
CHARACTERISTICS
4 independent 10/100Mbps Ethernet Access Ports
Direct interface with 10BaseT transceiver
IEEE 802.3u compliant MII (Media Independent In-
terface) and Serial Management interface
Direct interface with 100BaseTX, -T2, -T4, or -TF
physical transceivers
State of the art 0.5 micron 3.3Volt CMOS process
352-PIN BGA package
Operating frequency
-33
33 MHz maximum
-40
40 MHz maximum
-50
50 MHz maximum
32-bit Local Buffer Memory Interface
Supports 128k to 1M bytes
Utilize high performance 32-bit Synchronous
Burst SRAM
Hardware assisted Buffer and Queue Management
to minimized CPU overhead
16-bit Processor Bus I/O Interface
Allows host to access Control Registers & Local
Buffer Memory
Supports Big and Little Endian CPUs
Direct interface with various different standard
microprocessors including 386, 486 families and
Motorola MPC series embedded processors.
32-bit XpressFlow Bus Interface
Uses Granule for frame transferring between
Access Controllers
Supports unicast, multicast, and broadcast frames
Also detects IEEE 802.3X MAC Control frames
Works together with SC-201 XpressFlow Engine
Capable to forward frames at full line-rate
Distributed Flow Caching to reduce frame for-
warding latency
Supports both Half & Full Duplex operation
Programmable Flow Control Enable
Jam Fake Collision for Half Duplex Mode
Transmit Flow Control Frame for IEEE 802.3x
Full Duplex Mode
Three frame forwarding modes
Store-&-Forward
Safe Cut-Thru (Runt Free)
Turbo Cut-Thru (10Mbps Mode only)
Automatically selects the optimized mode for
forwarding
Allows manual frame forwarding mode selection
override
Multi-Media ready with QoS supports
Four frame transmission priority queues
Complies with IEEE 802.1 Bridge Standard
Assigns one unique MAC Address for each port
VLAN ID Tagging & Stripping
Auto padding if necessary after stripping
Automatic retry frame transmission
Transmit collision
Transmit buffer under-run
Automatic receive filtering for bad frames for Store
& Forward Mode
Bad FCS
Short events or frames under 64 bytes
Long events or frames over 1518 bytes
Automatic statistic collection for RMON
LOCAL
BUFFER
MEMORY
Management BUS
XpressFlow BUS
16
32
EA-224
4-Port Ethernet
Access Controller
10/100M BaseTx Xceiver
Port
1
Port
3
Port
2
Port
0
10/100M BaseTx Ports
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