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BCM5691 Datasheet(PDF) 9 Page - Broadcom Corporation.

No. de pieza BCM5691
Descripción Electrónicos  A Scalable Approach to Gigabit Ethernet Switch Design
Download  28 Pages
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Fabricante Electrónico  BOARDCOM [Broadcom Corporation.]
Página de inicio  http://www.broadcom.com
Logo BOARDCOM - Broadcom Corporation.

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White Paper
BCM567x/BCM569x
06/27/02
Broa d c om Co rp o r a t i o n
Document
567x_569x-WP100-R
StrataXGS Gigabit Ethernet Architecture
Page 3
With the StrataXGS family, Broadcom has improved the StrataSwitch architecture in several ways:
The depth of IP address tables and routing information has been significantly increased.
Switches that can store more route entries can support a greater number of attached devices.
StrataXGS family of components uses a widely used approach called hashing, which increases table lookup
performance compared with binary search capabilities.
Broadcom has built a special 10-Gbps chip-to-chip interface, which improves Scalability and performance.
QUALITY OF SERVICE
StrataXGS chips offer extensive support for packet classification, marking, and prioritization to enable QoS support. QoS on
the LAN is increasingly a checklist item for enterprise customers, who are beginning to run latency-sensitive applications
such as VoIP locally. End customers might also want to ensure the integrity of high-priority data applications and enforce
access control lists (ACLs).
By leveraging the HiGig interface, class-of-service markings and QoS can be integrated across a stack of chips used to build
a system so that markings are not lost when packets are passed from one component to another. All StrataXGS chip ports
support eight CoS queues into which traffic with different priority weights can be placed.
HIGIG™ INTERFACE
New to the Broadcom product family is a 10-Gbps, full-duplex chip-to-chip interface that enhances system scalability and
performance, called the HiGig interface. It adds an 8-byte header to the Layer 2 GE frame as it exits the interface. This
header contains information about the packet, its source and destination ports, and port mirroring. This information hastens
table lookups when two Broadcom components are connected together, thus improving overall system performance.
The HiGig interface allows the interconnection of several StrataXGS chip modules to form systems with different port
densities. Communication between the CPUs, a process called stacking, is performed in-band via the HiGig header using
special master/slave protocols developed by Broadcom. Link aggregation, port mirroring, and class-of-service markings are
fully supported across the interconnected modules at wire speeds.
INTEGRATED SERIALIZER/DESERIALIZER (SERDES)
A SerDes interface—which converts data from a parallel bus into a serial stream—is integrated onto each port of each
StrataXGS chip. This design precludes connections to external SerDes chips, simplifying design.
The integrated SerDes support, CoS functions, Broadcom API, and other StrataXGS features are described in more detail
in the section, “StrataXGS Features and Benefits in Depth.”


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