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Intel

®

820 Chipset Design Guide 4-5

Clocking

NOTES:

1. Differential Clocking Pair

2. CFM/CFM# driven by MCH

Table 4-3. Intel

®

820 Chipset Platform System Clock Cross-Reference

CK133/DRCG Pin Name Component Pin Name

PCICLK

PCI Slot CLK

PCI Slot CLK

PCI Slot CLK

PCI Slot CLK

PCI Slot CLK

ICH PCICLK-F

LPC Super I/O CLK

FWH Flash BIOS CLK

3V66

MCH GCLKIN

ICH CLK66

AGP Connector (on-board device) CLK

48 MHz ICH CLK48

CPUCLK

CPU BCLK

CPU BCLK

MCH HCLKIN

CPU_div2 DRCG Refclk

APIC

CPU PICCLK

CPU PICCLK

ICH APICCLK

Clk/ClkB

1

RDRAMs

MCH CTM/CTM#

CFM/CFM#

1,2

RDRAMs

PclkM MCH HCLKOUT

SynclkN MCH RCLKOUT