Personal Computer User Manual

Intel

820E Chipset

Design Guide 13

1. Introduction

The Intel

820E Chipset Design Guide provides design recommendations for systems using the Intel

820E chipset. This includes motherboard layout, routing guidelines, system design issues, system

requirements, debug recommendations, and board schematics. In addition to providing motherboard

design recommendations (e.g., layout and routing guidelines), this document also addresses system

design issues such as thermal requirements for Intel 820E chipset-based systems. The design

recommendations should be used during system design. The guidelines have been developed to provide

maximum flexibility to board designers while reducing the risk of board-related issues.

The Intel board schematics in Appendix A: Reference Design Schematics (Uniprocessor) implement

Intel

PGA370 architecture and are intended for use as references by board designers. While the

schematics included cover specific designs, the core schematics for each chipset component remain the

same for most Intel 820E chipset platforms. The appendix provides a set of reference schematics for each

chipset component, in addition to common motherboard options. Additional flexibility is possible via

other permutations of these options and components.

1.1. About This Design Guide

This design guide is intended for hardware designers who are experienced with PC architectures and

board design. This design guide assumes that the designer has a working knowledge of the vocabulary

and practices of PC hardware design.

• Chapter 1, Introduction — This chapter introduces the designer to the purpose and organization of

this design guide, and provides a list of references of related documents. This chapter also provides

an overview of the Intel 820E chipset.

• Chapter 2, Layout/Routing Guidelines — This chapter provides a detailed set of motherboard

layout and routing guidelines for designing an Intel 820E chipset-based platform. The

motherboard’s functional units are discussed (e.g., chipset component placement, system bus

routing, system memory layout, display cache interface, hub interface, IDE, AC’97, USB, interrupts,

SMBUS, PCD, LPC/FWH Flash BIOS, and RTC).

• Chapter 4, Advanced System Bus Design — This chapter discusses the AGTL+ guidelines and

theory of operation. It also provides more details about the methodologies used to develop these

guidelines.

• Chapter 4, Clocking — This chapter provides the motherboard clocking guidelines (e.g., clock

architecture, routing, capacitor sites, clock power decoupling, and clock skew).

• Chapter 5, System Manufacturing — This chapter includes the board stack-up requirements.

• Chapter 6, System Design Considerations— This chapter includes the guidelines for power

delivery, decoupling, thermal, and power sequencing.

• Appendix A, Reference Design Schematics (Uniprocessor) — This appendix provides a set of

schematics for uniprocessor designs. It also provides a feature list for board design.