PM3351 데이터 시트보기 (PDF) - PMC-Sierra

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PM3351

SINGLE PORT FAST ETHERNET SWITCH

PMC-Sierra 

DATA SHEET

PMC-970113

ISSUE 3

PM3351 ELAN 1X100

SINGLE PORT FAST ETHERNET SWITCH

RMON statistics at wire rates on all ports. The PM3351 chip contains all the required

elements of a high-performance Ethernet switch: an MII interface for connection to

physical-layer transceivers, MAC-layer processing logic, buffer FIFOs, a high-speed

DMA engine for fast frame transfers, a local memory interface for up to 4 Mbytes of

external buffer memory, a compatible PCI bus master and slave unit for modular

expansion, and a switch processing unit that implements the switching and bridging

functions. The only additional components required for each 100 Mbit/s switch port are

an MII compliant transceiver (supports 100BaseTX/FX, 100BaseT4,100BaseT2, and

any future 802.3-compliant 100Mbit MII PHYs), passive line interface devices, a bank of

external memory and a system clock. The amount of external memory may range up to

4 Mbytes, depending on the amount of frame buffering required and the number of

MAC addresses to be supported, and may be implemented using standard

asynchronous SRAM devices with 15 nsec access times. Switch configuration

information is provided to the PM3351 using a single EPROM or EEPROM; only one

EPROM is required in a multiple PM3351/PM3350 system.

The ELAN 1x100 device is implemented in a high-density, low-voltage CMOS

technology for low cost and high performance. It is available in a 208-pin Quad Flat

Pack, and is ideally suited for compact, low-cost desktop, workgroup and departmental

Ethernet switching applications.

DEVICE DATA

Introduction

The ELAN 1x100 (PM3351) offers a complete system-level solution, integrating all

required elements (except frame/address memory and transceiver logic) in a single

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

including management, RMON-level statistics collection, spanning tree support and

self-configuration, are performed by the ELAN 1x100 without need for external CPUs or

logic. In addition, the functions required for expandability are also integrated into the

device.

The ELAN 1x100 is built around a RISC CPU based switching processor core which is

closely 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 frame routing functions, and can switch packets arriving simultaneously from the

single100BaseT port 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

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 5

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