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
SC220
XpressFlow Engine
Characteristics Continue
SC220
XpressFlow
Engine
t Built-in address to port resolution
HISC Core
à
à
à
Embedded 32-bit HISC™ (High density
Instruction Set Core) Processor
CAM
Optimized architecture for switch appli-
cations
32
32
ADDRESS
MAPPING
TABLE
16
32
CAM
Interface
Loadable firmware for easy upgrade
16
Mngmt
Bus
Interface
t Supports unicast, multicast, and broadcast
16
32
HISC
I/O
Registers
frames
SRAM
t Address Filtering
Control
Buffer
Memory
Interface
CONTROL
BUFFER
MEMORY
32
32
32
32
à
Destination & Source MAC address
matching & filtering
32
32
32
t
VLAN classification & verification
Automatic
Buffer
Manager
à
Up to 62 groups
XpressFlow Bus
Interafce
à
à
à
Level 1 and 2 mapping
32
VLAN ID tagging & stripping
Auto padding if necessary after stripping
XpressFlow BUS
t Supports Store-&-Forward Frame Forward-
ing Mode
Block Diagram –
t Collects statistics for RMON
SC220 XpressFlow Engine
Typical Application:
à A 16-port Ethernet Switch with 4-Fast Ethernet
RS232 Local
Control Console
Address
Mapping
Table
SC220
XpressFlow
Engine
Switch
Manager
CPU
Buffer
RAM
Flash
ROM
DRAM
Management Bus
XpressFlow Bus
Buffer
RAM
Buffer
RAM
Buffer
RAM
EA208E
8-Port
EA208E
8-Port
EA234
4-Port
Ethernet
Access
Ethernet
Access
Ethernet
Access
Controller
Controller
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 Vertex Networks, Inc.
2
Rev. 4.5 – February
1999
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
