Design Guide VT82C694X Apollo Pro133a with VT82C686A South Bridge
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Design Guide VT82C694X Apollo Pro133A with VT82C686A South Bridge Preliminary Revision 0.5 November 19, 1999 VIA TECHNOLOGIES, INC. Copyright Notice: Copyright © 1999 VIA Technologies Incorporated. Printed in the United States. ALL RIGHTS RESERVED. No part of this document may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise without the prior written permission of VIA Technologies Incorporated. VT82C585, VT82C586B, VT82C587, VT82C590, VT82C595, VT82C596B, VT82C597, VT82C598, VT82C680, VT82C685, VT82C686B, VT82687, VT82C691, VT82C693, VT82C693A, VT82C694, VT82C694X, VT8501, VT8601, Super South, Apollo VP, Apollo VPX, Apollo VP2, Apollo VP3, Apollo MVP3, Apollo MVP4, Apollo P6, Apollo Pro, Apollo Pro133, Apollo Pro 133A, and Apollo ProMedia may only be used to identify products of VIA Technologies. 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We Connect Design Guide - VT82C694X Apollo Pro133 with VT82C686A REVISION HISTORY Document Date Revision Initials Release 0.5 11/19/99 Initial Release (Modified from DG694X&596BR070 and DG693A&686AR060) VL, JY, VH, RC, SS Preliminary Revision 0.5, November 19, 1999 i Revision History Technologies, Inc. We Connect Design Guide - VT82C694X Apollo Pro133 with VT82C686A TABLE OF CONTENTS Revision History ............................................................................................................................................i Table of Contents ..........................................................................................................................................i List of Figures...............................................................................................................................................i List of Tables.................................................................................................................................................i Introduction .................................................................................................................................................1 1.1 About This Design Guide ................................................................................................................................1 1.2 Apollo Pro133A Chipset Overview .................................................................................................................2 1.2.1 VT82C694X Apollo Pro133A North Bridge Features .................................................................................................. 2 1.2.2 Super South (VT82C686A) Chipset Features............................................................................................................... 3 1.2.3 System Block Diagram................................................................................................................................................ 4 1.3 System Design Recommendations...................................................................................................................5 Motherboard Design Guidelines ..................................................................................................................7 2.1 Ballout Assignment..........................................................................................................................................7 2.1.1 Apollo Pro133A North Bridge Ballout Assignment...................................................................................................... 7 2.1.2 "Super South" South Bridge Ballout Assignment......................................................................................................... 8 2.2 Motherboard Description................................................................................................................................9 2.2.1 Slot-1 Motherboard Placement and Routing................................................................................................................. 9 2.2.1.1 ATX Form Factor for Slot-1 System ................................................................................................................... 10 2.2.1.2 Micro ATX Form Factor for Slot-1 System......................................................................................................... 11 2.2.2 Socket-370 Motherboard Placement and Routing....................................................................................................... 12 2.2.2.1 ATX Form Factor for Socket-370 System ........................................................................................................... 13 2.2.2.2 Micro ATX Form Factor for Socket-370 System................................................................................................. 14 2.2.3 Printed Circuit Board Description.............................................................................................................................. 15 2.2.3.1 Four-Layer Board............................................................................................................................................... 15 2.2.3.2 Six-Layer Board................................................................................................................................................. 16 2.2.4 On Board Power Regulation...................................................................................................................................... 17 2.2.5 Capacitive Decoupling .............................................................................................................................................. 17 2.2.5.1 Single Slot-1 Processor Capacitive Decoupling................................................................................................... 18 2.2.5.2 Single Socket-370 Processor Capacitive Decoupling........................................................................................... 19 2.2.5.3 Apollo Pro133A Chipset Capacitive Decoupling................................................................................................. 20 2.2.5.4 DRAM Module Capacitive Decoupling .............................................................................................................. 20 2.2.6 Power Plane Partitions .............................................................................................................................................. 21 2.2.6.1 Power Plane Partitions for Slot-1 Motherboard ................................................................................................... 21 2.2.6.2 Power Plane Partitions for Socket-370 Motherboard ........................................................................................... 23 2.2.7 Chipset Power and Ground Layout Recommendations............................................................................................... 25 2.2.8 Power Up Configuration ........................................................................................................................................... 27 2.2.8.1 VT82C694X Power Up Strappings ..................................................................................................................... 28 2.2.8.2 VT82C686A Power Up Strappings ..................................................................................................................... 28 2.3 General Layout and Routing Guidelines ......................................................................................................29 2.3.1 Trace Attribute Recommendations............................................................................................................................. 29 2.3.2 Apollo Pro133A Clock Layout Recommendations....................................................................................................