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Fabricante

PM3350

8 PORT ETHERNET SWITCH

PMC-Sierra 

ELAN 8X10

DATA SHEET

PMC-970109

ISSUE 3

PM3350 ELAN 8 X10

8 PORT ETHERNET SWITCH

DEVICE DATA

Introduction

The PM3350 ELAN 8x10 offers a complete system-level solution, integrating all

required elements (except packet-buffer/address-table memory and transceiver logic) in

a single high-density VLSI chip. It is a true single-chip managed switch; all the required

functions, including address learning/aging, management, RMON-level statistics

collection, spanning tree support and self-configuration, are performed by the ELAN

8x10 without need for external CPUs or logic. In addition, the functions required for

expandability are also integrated into the device.

The ELAN 8x10 is built around a RISC CPU based Switch Processor core, coupled with

a multi-channel DMA controller, MAC-layer interface logic, FIFOs, a PCI-based

expansion port and a flexible memory controller.

Switch Processor

An on-chip Switch Processor is primarily responsible for performing the Ethernet / IEEE

802.3 packet switching functions, and can switch packets arriving simultaneously from

the eight 10BaseT ports and the expansion port at full wire rates using address tables

that it creates and maintains in external local memory. Store-and-forward switching is

performed, allowing the Switch Processor to detect CRC, length and alignment errors

and reject bad packets. The Switch Processor also supports IEEE 802.3

group/functional address handling. Address aging, topology change updates, and

statistics collection are performed by the Switch Processor as well.

The Switch Processor unit allows the device to support high-level capabilities. In

addition, it implements the full IEEE 802.1d spanning-tree transparent bridging protocol,

which allows the ELAN 8x10 to act as a eight-port expandable learning bridge,

performing learning, filtering and redirection at full speed. Finally, the Switch Processor

can host an SNMP agent for powerful remote switch configuration and diagnostic

capabilities, allowing systems built around the ELAN 8x10 to be managed in-band using

standard management platforms. When additional switch devices are connected to the

ELAN 8x10 expansion port, the Switch Processors in all ELAN 8x10s intercommunicate

to transparently support a distributed SNMP MIB.

In host-based applications, the host CPU may bypass the on-chip SNMP agent to

communicate directly with the Switch Processor for configuration, control and

monitoring purposes.

Multichannel DMA Processor

The on-chip DMA Coprocessor contains eleven independent and concurrently operating

channels, one for each of the eight 10BaseT ports and three dedicated to the

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND PMC-SIERRA, INC. CUSTOMERS ONLY

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