360 datasheet(86/95 Pages) INTEL

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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 Enhanced HALT Powerdown States

The Celeron D processor supports the HALT or Enhanced HALT powerdown state. The

Enhanced HALT Powerdown state is configured and enabled via the BIOS. The

Enhanced HALT state must be enabled via the BIOS for the processor to remain within

its specifications.

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

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

Refer to the following sections for details about the HALT and Enhanced HALT states.

Figure 15.

Processor Low Power State Machine

Enhanced HALT or HALT State

BCLK running

Snoops and interrupts allowed

Normal State

Normal execution

Enhanced HALT Snoop or HALT

Snoop State

BCLK running

Service snoops to caches

Stop Grant State

BCLK running

Snoops and interrupts allowed

Snoop

Event

Occurs

Snoop

Event

Serviced

INIT#, BINIT#, INTR, NMI, SMI#,

RESET#, FSB interrupts

STPCLK#

Asserted

STPCLK#

De-asserted

Snoop Event Occurs

Snoop Event Serviced

HALT or MWAIT Instruction and

HALT Bus Cycle Generated

Stop Grant Snoop State

BCLK running

Service snoops to caches

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