P R E L I M I N A R Y
D A T A
S H E E T
EA-224
– 4-Port Fast Ethernet Access Controller
(XpressFlow 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
-40
-50
33 MHz maximum
40 MHz maximum
50 MHz maximum
10/100M BaseTx Ports
10/100M BaseTx Xceiver
LOCAL
BUFFER
MEMORY
32
Port
0
TM
XpressFlow BUS
Management BUS
16
32
EA-224
4-Port Ethernet
Access Controller
Port
1
Port
2
Port
3
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
© 1997 Zarlink Semiconductor Inc.
Page:
1
Rev. 4.0 –December, 1997
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
