Chapter 4 System Support
4.5 SYSTEM 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, GMCH
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 Slim 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 Deskpro and Evo Personal Computers
Featuring Intel Celeron and Pentium III Processors
Fifth Edition – March 2002
4-22
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