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AP-479 APPLICATION NOTE Pentium Processor Clock Design November 1995 Order Number 241574-002 Information in this document is provided in connection with Intel products Intel assumes no liability whatsoev- er including infringement of any patent or copyright for sale and use of Intel products except as provided in Intel's Terms and Conditions of Sale for such products Intel retains the right to make changes to these specifications at any time without notice Microcomputer Products may have minor variations to this specification known as errata Other brands and names are the property of their respective owners Since publication of documents referenced in this document registration of the Pentium OverDrive and iCOMP trademarks has been issued to Intel Corporation Contact your local Intel sales office or your distributor to obtain the latest specifications before placing your product order Copies of documents which have an ordering number and are referenced in this document or other Intel literature may be obtained from Intel Corporation P O Box 7641 Mt Prospect IL 60056-7641 or call 1-800-879-4683 COPYRIGHT INTEL CORPORATION 1996 Pentium Processor Clock Design CONTENTS PAGE CONTENTS PAGE 1 0 INTRODUCTION 1 FIGURES 1 1 General Clocking Issues 1 Figure 1 Common Termination Techniques 2 2 0 Pentium PROCESSOR 82496 AND Figure 2 Clock Requirements for the 82491 SYSTEM CLOCK Pentium Processor and CPU- SPECIFICATIONS 2 Cache Chip Set 4 3 0 AVAILABLE CLOCK DRIVERS 7 Figure 3 An Example of an Acceptable Clock Waveform (Diodes Are 4 0 CLOCK GENERATION FOR THE Absent from the Input Pentium PROCESSOR AND THE Model) 5 CPU-CACHE CHIP SET 11 Figure 4 An Example of an Acceptable 4 1 Clock Generation for Fully Clock Waveform (Diodes Are Synchronous Systems 12 Present in the Input Model) 6 4 2 Clock Generation for Divided Figure 5 An Example of an Synchronous Systems 12 Unacceptable Clock Waveform (Diodes Are Absent from the 4 3 Clock Generation for Input Model) 7 Asynchronous Systems 16 Figure 6 A CPU Module with the 5 0 Pentium PROCESSOR WITH 256K