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
EA218
6+2 Ports 10Mb Ethernet Access Controller
XPRESSFLOW BUS
MANAGEMENT BUS
Characteristics Continue
32
16
ꢀ Works together with SC-220 Xpress-
Flow Engine
EA-218
XpressFlow
Bus Interafce
Management
Bus Interafce
Forwards frames at full line-rate
Local
Buffer
Memory
Local
Buffer
Memory
Automatic
Buffer
Manager
9
Distributed Flow Caching™ to re-
duce frame forwarding latency
Interface
ꢀ Half and Full Duplex operation
ꢀ Programmable Flow Control
MAC Interface
32
9
Jam Collision for Half Duplex
Mode
MAC Port #0 to #7
9
Transmit Flow Control Frame for
IEEE 802.3x Full Duplex Mode
Port 0
1
2
3
4
5
6
7
ꢀ Supports Store-&-Forward frame for-
warding mode
2-Port
100Base-Tx
PHY
6-Port
10BaseT PHY
ꢀ Multi-Media ready with QoS supports
9
Four frame transmission priority
queues
Port 0
1
2
3
4
5
6
7
ꢀ Complies with IEEE 802.1 Bridge
Standard
Block Diagram –
EA218E 8-Port Ethernet Access Controller
9
Assigns one unique MAC Address
for each port
Typical Application:
ꢀ VLAN ID Tagging & Stripping
9
A 22-port Ethernet Switch with 2-Fast Ethernet
9
Auto padding if necessary after
stripping
ꢀ Automatic retry frame transmission
RS232 Local
Control Console
9
9
Transmit collision
Address
Mapping
Table
SC220
XpressFlow
Engine
Transmit buffer under-run
Switch
Manager
CPU
ꢀ Automatic receive filtering for bad
frames for Store & Forward Mode
Buffer
RAM
Flash
ROM
DRAM
9
9
Bad FCS
Management Bus
XpressFlow Bus
Short events or frames under 64
bytes
9
Long events or frames over
1518/1522 bytes
Buffer
RAM
Buffer
RAM
Buffer
RAM
EA218E
8-Port
EA218E
8-Port
EA218
8-Port
Ethernet
Access
Controller
ꢀ Automatic statistic collection for
RMON
Ethernet
Access
Controller
Ethernet
Access
Controller
8 Ethernet ports
8 Ethernet ports
Six 10M Ethernet + two
100M Fast Ethernet ports
System Block Diagram --
22-Ports Ethernet Switch with 2 Fast Ethernet Up-Links
© 1998 Zarlink Semiconductor, Inc.
2
Rev. 2.1- February, 1999
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
