SC220 ZARLINK [Zarlink Semiconductor Inc], SC220 Datasheet - Page 2

• Manufacturer Part Number: SC220
• Description: XpressFlow 2020 Ethernet Routing Switch Chipset
• Manufacturer: ZARLINK [Zarlink Semiconductor Inc]

© 1998 Vertex Networks, Inc.
1999
Distinctive Characteristics
t Highly integrated central switch controller
t State of the art 0.35 micron 3.3 Volt CMOS
t 256-PIN PQFP package
t Operating frequency
t 16-bit external CAM interface
t 32-bit Control Buffer Memory interface
t Hardware assisted Buffer and Queue Man-
t 32-bit Management Bus I/O interface
t 32-bit XpressFlow Bus Interface
t Full IP Switching
t MAC Address Mapping Table
process
agement to minimize CPU overhead
1.28 Gbps @ 40 MHz system clock
1.60 Gbps @ 50 MHz system clock
2.10 Gbps @ 66.67 MHz system clock
-40
-50
-66
Supports ½ k to 16k MAC addresses
Supports 128k to 1M bytes
Utilize high performance 32-bit Syn-
chronous Burst SRAM
Allows host to access CAM and Control
Buffer Memory
Supports Big and Little Endian CPUs
Direct interface with various different
standard microprocessors including
386, 486 families and Motorola MPC se-
ries embedded processors
Switching bandwidth
Supports up to 8 Multi-port Network Ac-
cess Controllers
XpressFlow Bus access arbitration
XpressFlow Bus data transfer load
regulation
Supports either CAM based or SRAM
based Switching data base
Addresses resolved by SC220
40 MHz maximum
50 MHz maximum
66 MHz maximum
P R E L I M I N A R Y
SC220 – XpressFlow Engine
General Description
terface and buffer management logic in order to do the switching
decision making for unicast, multicast, and broadcast frames.
Hardware assisted queue manager is incorporated to facilitate
buffer management. It also provides a generic Management Bus
interface to allow external processor to do initialization, learning,
VLAN, and RMON support, etc. In addition, a XpressFlow Bus
interface block is responsible for communicating with the Network
Access Controllers through the XpressFlow message passing
protocol.
Related Components:
t
t
t
XpressFlow 2020 Ethernet Routing Switch Chipset
EA218E – 8-port 10Mbps Ethernet Access Controller
EA218 – 6-port 10 + 2-port 10/100 Ethernet Access Controller
EA234 – 4-port 10/100 Fast Ethernet
The XpressFlow Engine contains the switching data base in-
CONTROL
MEMORY
ADDRESS
BUFFER
(Optional)
MAPPING
TABLE
C A M
1
SC220 - XpressFlow Engine
16
32
X p r e s s F l o w
XpressFlow BUS
I N F O R M A T I O N
XpressFlow BUS
SC220
32
ENGINE
32
Rev. 4.5 – February