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Chapter 4 Power Management 9

23802E—September 2000 AMD Duron™ Processor Data Sheet

Preliminary Information

4 Power Management

4.1 Power Management States

The AMD Duron™ processor uses multiple advanced power

states to place the processor in reduced power modes. These

power states are used to enhance processor performance,

minimize power dissipation, and provide a balance between

performance and power (see “Power Dissipation” on page 22

for more information). In addition, these power states conform

to the industry-standard Advanced Configuration and Power

Interface (ACPI) requirements for processor power states.

(ACPI is a specification for system hardware and software to

support OS-oriented power management.) Each state has a

specific mechanism that allows the processor to enter the

respective state. Figure 3 shows the power management states

of the AMD Duron processor. The figure includes the ACPI

power states for the processor, labeled as Cx.

Figure 3. AMD Duron™ Processor Power Management States

Auto Halt

Normal /

Full-On

Execute HLT and Special Cycle

SMI#, INTR, NMI, INIT#, RESET#

Incoming Probe

STPCLK# asserted

Stop Grant

Incoming Probe

Probe Serviced

Probe

State

STPCLK# deasserted

Read PLVL2 register

Sleep

Legend:

Hardware transitions

Software transitions

Note *

Note: The C1 to C2 transition by way of the STPCLK# assertion/deassertion is not defined for ACPI-compliant systems.

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