E2000 datasheet(88/104 Pages) INTEL

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Features

Datasheet

6.2

Clock Control and Low Power States

The processor allows the use of AutoHALT and Stop-Grant states to reduce power

consumption by stopping the clock to internal sections of the processor, depending on

each particular state. See Figure 22 for a visual representation of the processor low

power states.

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.

Figure 22.

Processor Low Power State Machine

Normal State

- Normal Execution

Stop Grant State

- BCLK running

- Snoops and interrupts

allowed

Stop Grant Snoop State

- BCLK running

- Service Snoops to cahces

Extended HALT Snoop or

HALT Snoop State

- BCLK running

- Service Snoops to cahces

Extended HALT or HALT

State

- BCLK running

- Snoops and interrupts

allowed

HALT or MWAIT Instruction and

HALT Bus Cycle Generated

INIT#, BINIT#, 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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