eMac Developer Note.pdf

Developer Note

eMac

October 2002

Apple Computer, Inc.

No part of this publication may be

reproduced, stored in a retrieval

system, or transmitted, in any form or

by any means, mechanical, electronic,

photocopying, recording, or

otherwise, without prior written

permission of Apple Computer, Inc.,

with the following exceptions: Any

person is hereby authorized to store

documentation on a single computer

for personal use only and to print

copies of documentation for personal

use provided that the documentation

contains Apple’s copyright notice.

The Apple logo is a trademark of

Apple Computer, Inc.

Use of the “keyboard” Apple logo

(Option-Shift-K) for commercial

purposes without the prior written

consent of Apple may constitute

trademark infringement and unfair

competition in violation of federal

and state laws.

No licenses, express or implied, are

granted with respect to any of the

technology described in this book.

Apple retains all intellectual property

rights associated with the technology

described in this book. This book is

intended to assist application

developers to develop applications

only for Apple-labeled or

Apple-licensed computers.

Every effort has been made to ensure

that the information in this document

is accurate. Apple is not responsible

for typographical errors.

Apple Computer, Inc.

1 Infinite Loop

Cupertino, CA 95014

408-996-1010

Apple, the Apple logo, AirPort,

FireWire, iMac, Mac, and Macintosh

are trademarks of Apple Computer,

Inc., registered in the United States

and other countries.

iBook, SuperDrive, Combo drive ,and

Velocity engine are trademarks of

Apple Computer, Inc.

Adobe, Acrobat, and PostScript are

trademarks of Adobe Systems

Incorporated or its subsidiaries and

may be registered in certain

jurisdictions.

Simultaneously published in the

United States and Canada.

Even though Apple has reviewed this

manual, APPLE MAKES NO

WARRANTY OR REPRESENTATION,

EITHER EXPRESS OR IMPLIED, WITH

RESPECT TO THIS MANUAL, ITS

QUALITY, ACCURACY,

MERCHANTABILITY, OR FITNESS

FOR A PARTICULAR PURPOSE. AS A

RESULT, THIS MANUAL IS SOLD “AS

IS,” AND YOU, THE PURCHASER, ARE

ASSUMING THE ENTIRE RISK AS TO

ITS QUALITY AND ACCURACY.

IN NO EVENT WILL APPLE BE LIABLE

FOR DIRECT, INDIRECT, SPECIAL,

INCIDENTAL, OR CONSEQUENTIAL

DAMAGES RESULTING FROM ANY

DEFECT OR INACCURACY IN THIS

MANUAL, even if advised of the

possibility of such damages.

THE WARRANTY AND REMEDIES SET

FORTH ABOVE ARE EXCLUSIVE AND

IN LIEU OF ALL OTHERS, ORAL OR

WRITTEN, EXPRESS OR IMPLIED. No

Apple dealer, agent, or employee is

authorized to make any modification,

extension, or addition to this warranty.

Some states do not allow the exclusion or

limitation of implied warranties or

liability for incidental or consequential

damages, so the above limitation or

exclusion may not apply to you. This

warranty gives you specific legal rights,

and you may also have other rights which

vary from state to state.

Contents

Figures and Tables

Preface

About This Developer Note

Chapter 1

Introduction

New Features 11

All Features 12

External Features 15

System Software 16

Computer Identification 16

Velocity Engine Acceleration

Chapter 2

Architecture

Block Diagram and Buses

Block Diagram 19

Main ICs and Buses 20

Microprocessor and Cache 21

PowerPC G4 Microprocessor

Level 2 Cache 22

Uni-N Bridge and Memory Controller

Processor Bus 22

Main Memory Bus 23

Accelerated Graphics Port Bus

Video Display Subsystem

PCI Bus 24

Boot ROM 24

Ethernet Controller

FireWire Controller

Apple Computer, Inc. October 2002

CONTENTS

KeyLargo I/O Controller

DMA Support

Interrupt Support

USB Interface 26

Ultra DMA Interface

Enhanced IDE Interface

Modem Slot Support

Wireless LAN Module

Sound Circuitry

Power Controller

Chapter 3

Devices and Ports

USB Ports 31

USB Connectors

USB Features 32

Wake Up From Sleep

Connect and Resume

USB Storage Devices

USB Controller

FireWire Ports 33

FireWire Device Programming

FireWire Connector

Target Disk Mode

Ethernet Port

Internal Modem

AirPort Card 38

Data Security 39

AirPort Hardware

AirPort Software

Hard Disk Drive 40

Combo Drive DVD-ROM/CD-RW

SuperDrive DVD-R/CD-RW Drive

CD-RW Drive 42

Video Display 43

Video Monitor Port 44

Video Display Connector

Apple Computer, Inc. October 2002

CONTENTS

Keyboard 45

Keyboard Features 45

Keyboard Layout 46

MultiMedia Control Keys

Keyboard and USB

Mouse 47

Sound System 48

Sound Inputs 48

Built-in Microphone 48

External Sound Input Jack

Sound Outputs

Internal Speakers

Headphone Jack

Sound Specifications

Chapter 4

RAM Expansion

RAM Expansion Slots 53

RAM Expansion Modules 54

Mechanical Design of RAM DIMMs

Electrical Design of RAM DIMMs

DIMM Configurations

RAM Addressing

Appendix A

Supplemental Reference Documents

Apple Technical Notes

3D Graphics 60

PowerPC G4 Microprocessor

Velocity Engine (AltiVec)

Mac OS X

Mac OS 9.2.2

I/O Kit 62

RAM Expansion Modules

ATA Interface

USB Interface

Apple Computer, Inc. October 2002

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