Compaq W4000 manual System Clock Distribution, Clock Generation and Distribution

Technical Reference Guide

4.5SYSTEM CLOCK DISTRIBUTION

These systems use an Intel CK-type clock generator and crystal for generating the clock signals required by the system board components. Table 4-13 lists the system board clock signals and how they are distributed.

Table 4-13.Clock Generation and Distribution

Table 4-13.

Clock Generation and Distribution

Frequncy	Source	Destination
66, 100, or 133 MHz	CK	Processor, MCH
100 or 133 MHz	CK	DIMM sockets
66 MHz	CK	ICH2, AGP Graphics Cntlr. [1]
48 MHz	CK	ICH2, I/O Cntlr.
33 MHz	CK	Processor, ICH2, PCI Slots
14.31818 MHz	Crystal	CK

NOTES:

[1]Routed to on-board controller on Deslpro EN SFF.

Routed to AGP slot on Desktop and Configurable Minitower.

Certain clock outputs are turned off during reduced power modes to conserve energy. Clock output control is handled through the SMBus interface by BIOS.

Compaq Evo and Workstation Personal Computers4-23

Featuring the Intel Pentium 4 Processor

Second Edition - January 2003