Intel Pentium 4 Processor CK00 Clock Synthesizer/Driver Design Guidelines

CK00 Clock Synthesizer/Driver Design Guidelines
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1. Introduction
This document provides technical specifications for development of the CK00 class of clock
components, based on requirements of the Intel
®
Pentium
®
4 processor and other Intel
Architecture (IA) platforms. The CK00 is intended to be applicable to a wide variety of system
implementations. The CK00 class of clocks contains new features, most notably the adoption
of a new differential clock output type.
1.1 Clock Synthesizer Overview
The clock synthesizers defined here will source multiple clock types: e.g. differential Host clock,
66MHz clock, PCI clock, and others as defined by IA system requirements. These definitions
deal with the Host clocks, Memory reference (Mref) clocks, 3V 66MHz clocks, 33MHz PCI
clocks, 48MHz clocks, and 14.318MHz clocks.
The 3.3V input signaling specification follows the JEDEC standard for LVTTL signaling. The
3.3V power delivery specification follows the JEDEC standard range 3.3V
±
5%.
This document shows examples of implementations including pin-outs. Implementations shown
here include a solution contained in one package and a similar solution split into two packages.
This is shown in Figure 1. Specific platforms may require implementations similar or identical to
each example.
The differential host clocks have many configuration options summarized in the appendices of
this document. In all cases, unless otherwise communicated, the differential clock design
should be optimized for the Voh=0.7V configurations shown in the appendix.
1.2 Applicable Documents
The latest revisions of the following are used as reference documents:
JEDEC Reference
JEDEC Standard No. 8-1A, Interface Standard for 3.3
±
0.3 V Power Supply & Digital Integrated Circuits.
Voltage and Interface Standard for Non-terminated Digital Integrated Circuit.
PCI Reference
The PCI Special Interest Group is an industry-wide group that controls the official PCI
specification. You can obtain the latest copies of the PCI specification by contacting the PCI
Special Interest Group at the following numbers:
[phone] - USA
[phone] - Fax
[phone] - International