P
R
E
L
I
M
I
N
A
R
Y
I
N
F
O
R
M
A
T
I
O
N
XpressFlow-2020 Series –
Ethernet Switch Chipset
ing mode
EA218E
8-Port 10Mb Ethernet Access Controller
XPRESSFLOW BUS
Characteristics Continue
Automatically selects the opti-
mized 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
1518/1522 bytes
Automatic statistic collection for
RMON
Address
Mapping
Table
32
MANAGEMENT BUS
32
16
EA-218E
Local
Buffer
Memory
Local
Buffer
Memory
Interface
XpressFlow
Bus Interafce
Management
Bus Interafce
32
Automatic
Buffer
Manager
MAC Interface
32
MAC Port #0 to #7
Port 0
1
2
3
4
5
6
7
8-Port
10BaseT PHY
Port 0
1
2
3
4
5
6
7
Block Diagram –
EA218E 8-Port Ethernet Access Controller
Typical Application
:
A 16-port Ethernet Switch with 4-Fast Ethernet
RS232 Local
Control Console
Buffer
RAM
SC220
XpressFlow
Engine
Flash
ROM
Switch
Manager
CPU
DRAM
Management Bus
XpressFlow Bus
Buffer
RAM
EA218E
8-Port
Ethernet
Access
Controller
Buffer
RAM
EA218E
8-Port
Ethernet
Access
Controller
Buffer
RAM
EA234
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
© 1998
Zarlink Semiconductor, Inc.
2
Rev.2.1 – February, 1999
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
