Intel 220 LE80557RE009512 Ficha De Dados

14

Datasheet

This is the normal operating state for the processor.

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.

The system can generate a STPCLK# while the processor is in the HALT Power Down 

state. When the system de-asserts the STPCLK# interrupt, the processor will return 

execution to the HALT state.

While in HALT Power Down state, the processor will process bus snoops.

- Normal Execution

- BCLK running

- Snoops and interrupts 

      allowed

- BCLK  running

- Service Snoops to caches

- BCLK  running

- Service Snoops to caches

- BCLK  running

- Snoops and interrupts 

      allowed

HALT or MWAIT Instruction and

HALT Bus Cycle Generated
INIT#, BINT#, 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