SC220 datasheet(2/34 Pages) ZARLINK

2 / 34 page

PRELIMINARY

INFORMATION

Rev. 4.5 – February

1999

Distinctive Characteristics

Highly integrated central switch controller

State of the art 0.35 micron 3.3 Volt CMOS

process

256-PIN PQFP package

Operating frequency

◊ -40

40 MHz maximum

◊ -50

50 MHz maximum

◊ -66

66 MHz maximum

16-bit external CAM interface

◊ Supports ½k to 16k MAC addresses

32-bit Control Buffer Memory interface

◊ Supports 128k to 1M bytes

◊ Utilize high performance 32-bit Syn-

chronous Burst SRAM

Hardware assisted Buffer and Queue Man-

agement to minimize CPU overhead

32-bit Management Bus I/O interface

◊ 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

32-bit XpressFlow Bus Interface

◊ Switching bandwidth

−1.28 Gbps @ 40 MHz system clock

−1.60 Gbps @ 50 MHz system clock

−2.10 Gbps @ 66.67 MHz system clock

◊ Supports up to 8 Multi-port Network Ac-

cess Controllers

◊ XpressFlow Bus access arbitration

◊ XpressFlow Bus data transfer load

regulation

Full IP Switching

◊ Addresses resolved by SC220

MAC Address Mapping Table

◊ Supports either CAM based or SRAM

based Switching data base

SC220 – XpressFlow Engine

XpressFlow 2020 Ethernet Routing Switch Chipset

CONTROL

BUFFER

MEMORY

XpressFlow BUS

SC220

XpressFlow

ENGINE

ADDRESS

MAPPING

TABLE

CAM

(Optional)

SC220 - XpressFlow Engine

General Description

The XpressFlow Engine contains the switching data base in-

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 EA218E – 8-port 10Mbps Ethernet Access Controller

t EA218 – 6-port 10 + 2-port 10/100 Ethernet Access Controller

t EA234 – 4-port 10/100 Fast Ethernet

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