BCM5671_ データシートの表示（PDF） - Broadcom Corporation

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BCM5671_

A Scalable Approach to Gigabit Ethernet

Broadcom Corporation 

■ BCM567x/BCM569x

White Paper

06/27/02

STRATAXGS PRODUCT FAMILY

The two primary chip components of the Broadcom StrataXGS Gigabit Ethernet switch architecture are the StrataXGS

BCM5670 and the StrataXGS BCM5690. The BCM5670 is a high-speed (160-Gbps) switch fabric, also called a backplane

or interconnect, that has eight 10-Gbps ports. A smaller version, the BCM5671, is an 80-Gbps switch fabric with four

10-Gbps ports. The 10-Gbps ports on the BCM5670 and BCM5671 are the building blocks for interconnecting line cards to

a switch fabric. A 10-slot chassis, for example, can be designed with eight line cards and two management cards.

The 10-Gbps ports on the BCM5670/71 accept traffic from the 10-Gbps uplinks in other chip components, these can be

arranged in a variety of configurations to build a Gigabit Ethernet switch of the size and configuration that matches the

designer’s business plan. Once traffic is placed on the switch fabric, it is switched, with no delay, to its egress port.

Switching with no delay is possible because the total bandwidth available on the switch fabric is greater than the sum of the

speeds of all the ports feeding traffic onto it. Therefore, no buffering queues are required that could introduce added delays.

This design approach is called a nonblocking architecture. Combining chips expands the number of ports in a system while

also retaining the nonblocking throughput characteristics of a single switch.

Lookup of

HiGig

Frame tag

10G

10G

HiGig HiGig

QUEUE SYSTEM

ARL

RAM

RAM

HiGig HiGig

10G

10G

8 priority levels

per port

On-chip Memory

Figure 1: BCM5670 Block Diagram

Page 4 StrataXGS Product Family

Broadcom Corporation

Document 567x_569x-WP100-R

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