Design Guide

Introduction

Intel

855GM/855GME Chipset Platform Design Guide 21

1. Introduction

This design guide provides Intel’s design recommendations for the Intel 855GM/855GME chipset based

systems. The guidelines have been developed to ensure maximum flexibility for board designers while

reducing the risk of board related issues.

Table 1. Conventions and Terminology

Convention/Terminology Definition

AC Audio Codec

AMC Audio/Modem Codec

Anti-Etch Any plane-split, void or cutout in a VCC or GND plane is referred to as an anti-etch

ASF Alert Standards Format

BER Bit Error Rate

FSB Intel Pentium M/ Pentium M on 90 nm Process with 2 MB L2 Cache/Celeron M Front

Side Bus –Processor to GMCH interface.

CMC Common Mode Choke

EMI Electro Magnetic Interference

ESD Electrostatic Discharge

FS Full Speed – Refers to USB 1.1 Full Speed

FWH Firmware Hub – A non-volatile memory device used to store the system BIOS.

HS High Speed – Refers to USB 2.0 High Speed

ICH4-M I/O Controller Hub Fourth Generation – Mobile (82801DBM)

Intel Pentium M Refers to the Intel Pentium M Processor and Intel Pentium M Processor on 90 nm

Process with 2 MB L2 Cache. This document refers to both processors as the Intel

Pentium M Processor unless explicitly specified

LCI LAN Connect Interface

LOM LAN on Motherboard

LPC Low Pin Count

LS Low Speed – Refers to USB 1.0 Low Speed

MC Modem Codec

Montara-GM Intel 852GM Chipset GMCH

Montara-GM+ Intel 852GME Chipset GMCH

GMCH Graphics Memory Controller Hub – Applies to both Intel855GM / Intel 855GME

PCM Pulse Code Modulation

PLC Platform LAN Connect

RTC Real Time Clock

PWM Pulse Width Modulation

SMBus System Management Bus – A two-wire interface through which various system