PM3350-SW datasheet(40/224 Pages) PMC

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ELAN 8X10

PM3350 ELAN 8 X10

DATA SHEET

PMC-970109

ISSUE 3

8 PORT ETHERNET SWITCH

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

FUNCTIONAL DESCRIPTION

Overview

This section will provide an overview of the PM3350 ELAN 8x10 system and internal

components, the device initialization and configuration process, the structures built and

used by the device to perform its functions, and a brief description of how packets are

switched by the device.

System Components

In order to describe the functions and operation of the ELAN 8x10 device, it is first

necessary to discuss the operating environment that is intended to be built around it. A

typical simple switching system utilizing the ELAN 8x10 device consists of:

The ELAN 8x10 device itself.

A set of DRAM devices that provide the operating memory for the ELAN 8x10,

mapped to the lowest bank of the ELAN 8x10 address space (i.e., addresses

starting at 0x000000 hex). The amount of DRAM provided is a system-

dependent parameter; the minimum amount required is 1 MB of RAM.

An EPROM containing the bootstrap image for the ELAN 8x10, i.e., the

operating firmware, operating parameters, and system initialization code; this

EPROM is mapped into the second lowest bank of the ELAN 8x10 memory

address space, i.e., the 4 MB address range starting at address 0x400000 hex.

The size of the EPROM is highly dependent on the operating configuration of

the ELAN 8x10, with the minimum requirement being 32 kB.

External transceiver devices that implement the PHY layer functions required for

10BaseT Ethernet.

An LED register, connected to a bank of eight LEDs, that may be used to report

status information for diagnostic purposes if required. The LED register is

mapped into the third bank of ELAN 8x10 memory address space, starting at

0x800000 hex.

A system voltage monitor or other means of asserting a system reset for a

specified time after the power supply voltage has stabilized, plus, if necessary, a

pushbutton switch for forcing a system reset after power-up.

A set of pull-up and pull-down resistors that are connected to the ELAN 8x10

data bus in order to drive device configuration information on to the data bus

during system reset.

Note that the above system description assumes, for simplicity, a single ELAN 8x10

device in the system. Multiple devices may be interconnected via the PCI expansion

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