3000 datasheet(88/102 Pages) INTEL

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Features

Dual-Core Intel® Xeon® Processor 3000 Series 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. Refer to the Conroe Processor Family BIOS Writer's Guide (BWG) for

Extended HALT configuration information.

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 following sections 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 transitions to the Normal state upon the occurrence of SMI#, INIT#, or

LINT[1:0] (NMI, INTR). RESET# causes the processor to immediately initialize itself.

Figure 6-1. Processor Low Power State Machine

Normal State

- Normal Execution

Extended Stop Grant

State or Stop Grant State

- BCLK running

- Snoops and interrupts

allowed

Extended Stop Grant

Snoop or Stop Grant

Snoop State

-BCLK running

- Service Snoops to caches

Extended HALT Snoop or

HALT Snoop State

-BCLK running

- Service Snoops to caches

Extended HALT or HALT

State

-BCLK running

- Snoops and interrupts

allowed

HALT or MWAIT Instruction and

HALT Bus Cycle Generated

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

FSB interrupts

STPCLK#

Asserted

STPCLK#

De-asserted

STPCLK#

Asserted

STPCLK#

De-asserted

Snoop

Event

Occurs

Snoop

Event

Serviced

Snoop Event Occurs

Snoop Event Serviced

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