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XpressFlow-2001 Series –
Ethernet Switch Chip-set
EA-224
4-Port 10/100M Ethernet Access Controller
2. GENERAL DESCRIPTION:
The
EA-224
provides
four
10/100Mbps Ethernet network ac-
cess interface ports. MII interface
is used to connect external PHY
devices for 100 Mbps Ethernet.
They also can direct connect with
standard 10Mbps serial interface.
The EA-224 provides the Ethernet
MAC protocols, handles the local
buffer memory interface and
management, arbitrates among
multiple priority queues, and in-
terfaces with the
XpressFlow
En-
gine and other Access Controllers
through the
XpressFlow
message
passing protocol.
Local
Buffer
Memory
32
SWITCH BUS
Management BUS
32
16
EA-224
Local
Buffer
Memory
Interface
Switch Bus
Interafce
Managem
Bus Interafce
32
Automatic
Buffer
Manager
MAC Interface
32
MAC Port #0 to #3
Port 0
1
2
3
2.1 Related Components:
4-Port 100Base-Tx PHY
SC-201
– XpressFlow Engine
EA-208E
– 8-port 10Mbps
Ethernet Access Controller
EA-208
– 6-port 10 + 2-port
10/100 Ethernet Access Con-
troller
EA-222
– 2-port 10/100 Fast
Ethernet Access Controller
Address
Mapping
Table
Port 0
1
2
3
Block Diagram –
EA-224 4-Port Ethernet Access Controller
RS232 Local
Control Console
2.2 Typical Application:
A 16-port Ethernet Switch with
4 Fast Ethernet Up-Links
Buffer
RAM
SC201
XpressFlow
Engine
Flash
ROM
Switch
Manager
CPU
DRAM
Management Bus
XpressFlow Bus
Buffer
RAM
EA208E
8-Port
Ethernet
Access
Controller
Buffer
RAM
EA208E
8-Port
Ethernet
Access
Controller
Buffer
RAM
EA224
4-Port
Ethernet
Access
Controller
8 Ethernet ports
8 Ethernet ports
Four 100M
Fast Ethernet ports
System Block Diagram --
16-Port Ethernet Switch with 4 Fast Ethernet Up-Links
© 1997 Zarlink Semiconductor Inc.
Page: 2
Rev. 4.0 –December, 1997
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
