AMD-762 datasheet(37/122 Pages) AMD

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Chapter 2

Functional Operation

24416C—December 2001

AMD-762™ System Controller Data Sheet

Preliminary Information

2.6

Power Management

The AMD-762 system controller supports the Advanced

Configuration Power Interface (ACPI) specification, On-Now,

and PC 99 requirements through a handshake mechanism with

the processor. The ACPI-defined registers required for processor

and system p owe r m a nagem e n t are cont ained in th e

Southbridge. SMM memory remapping is handled by a

model-specific register in the AMD Athlon processor. See the

AMD Athlon™ BIOS Developers Guide, order# 21656, for more

information about the SMM remapping operation.

Figure 9 shows how the processor and system controller

communicate power-state transitions.

Figure 9.

Power Management Signal Connections

133-MHz

System

Clocks

66-MHz

AGP

Clock

33-MHz

PCI

Clocks

Clock Generator

AMD Athlon™

Processors

0 and 1

AMD-762™ Sys-

tem Controller

(Northbridge)

AMD-768™

Peripheral

Bus Controller

(Southbridge)

DDR SDRAMs

STPCLK#

AMD Athlon

Processor

System Bus

PCI BUS

CKE

DCSTOP#

RESET#

CLK

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