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Features

Datasheet

6.2.1

Normal State

This is the normal operating state for the processor.

6.2.2

HALT and Extended HALT Powerdown States

The processor supports the HALT or Extended HALT powerdown state. The Extended

HALT Powerdown must be enabled via the BIOS for the processor to remain within its

specification.

The Extended HALT state is a lower power state as compared to the Stop Grant State.

If Extended HALT is not enabled, the default Powerdown state entered will be HALT.

Refer to the sections below for details about the HALT and Extended HALT states.

6.2.2.1

HALT Powerdown State

HALT is a low power state entered when all the processor cores have executed the HALT

or MWAIT instructions. When one of the processor cores executes the HALT instruction,

that processor core is halted, however, the other processor continues normal operation.

The processor will transition to the Normal state upon the occurrence of SMI#, INIT#,

or LINT[1:0] (NMI, INTR). RESET# will cause the processor to immediately initialize

itself.

The return from a System Management Interrupt (SMI) handler can be to either

Normal Mode or the HALT Power Down state. See the Intel Architecture Software

Developer's Manual, Volume III: System Programmer's Guide for more information.

Figure 22.

Processor Low Power State Machine

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