Intel QX6700 HH80562PH0678M User Manual

84

Datasheet

This is the normal operating state for the processor.

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.

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.

     - Normal Execution

   - BCLK running

   - Snoops and interrupts 

      allowed

   - BCLK running

   - Service Snoops to cahces

   - BCLK running

   - Service Snoops to cahces

   - 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

SleepStateFigure