Compaq Deskpro EP 6233 - System Clock Distribution

Chapter 4 System Support
Compaq Deskpro EP Series of Personal Computers
First Edition - April 1998
4-28
4.5 SYSTEM CLOCK DISTRIBUTION
Table 4-17 lists the system board clock signals and how they are distributed.
Table 4–17.
Clock Generation and Distribution
Table 4-17.
Clock Generation and Distribution
Frequncy/Signal Source Destination
66, 100 MHz
(CPUCLK) [1]
[2] Processor, 82443 N. Bridge
66 MHz North Bridge AGP Slot
48 MHz “ 82371 S. Bridge, 87309 I/O Cntlr.
33 MHz (PCICLK) “ PCI Slots, 82371 S. Bridge
14.31818 MHz Crystal [2]
14.31818 MHz [2] South Bridge, ISA slots
8.33 MHz (BCLK) South Bridge ISA slots
32.77 KHz Crystal South Bridge
NOTES:
[1] 66-MHz slot 1 system board; 66 MHz only.
100-MHz slot 1 system board; 66 or 100 MHz (refer to
Chapter 3, “Processor/Memory Subsystem”)
[2] 66-MHz slot 1 system board uses W48C67-07 clock generator.
100-MHz slot 1system board uses CK100 clock generator.