AMD-762 datasheet(35/122 Pages) AMD

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Chapter 2

Functional Operation

24416C—December 2001

AMD-762™ System Controller Data Sheet

Preliminary Information

The AMD-762 system controller provides the three 66-MHz

clocks required for the Southbridge and the two PCI bus slots

in this mode. If a 33-MHz-only card is inserted in one of the

66-MHz PCI slots, then the M66EN signal is deasserted, which

causes the AMD-762 system controller to drive 33 MHz on the

PCI_66CLK[2:0] pins.

The 66-MHz PCI mode is illustrated in Figure 7.

33-MHz PCI Bus

An alternate mode of PCI bus operation is illustrated in Figure

8 on page 24, and simply supports a standard 33-MHz PCI

Southbridge and up to seven PCI slots.

In this mode, all PCI devices operate at 33 MHz and clocking is

provided by the motherboard clock generator chip.

Figure 7.

System Clocking with 66-MHz PCI Primary Bus

100/133 MHz

66 MHz

SYSCLK

AGPCLK

CLKOUT[0]n

CLKOUT[1]n

CLKOUT[3]n

CLKOUT[2]n

DDR DIMMs

PCI_66CLK[2]

PCI_66CLK[1]

PCI_66CLK[0]

PCICLK

AMD-762™ System Controller

Northbridge

AMD-768™ Peripheral

Bus Controller

64-bit, 66-MHz

PCI Bus Slots

66 MHz

AGP Slot

32-bit, 33-MHz PCI Bus Slots

33 MHz

33-MHz PCI Clocks

Clock

Generator

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