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Datasheet

Features

6.2.2

AutoHALT Powerdown State—State 2

AutoHALT is a low power state entered when the processor executes the HALT instruction. The

processor will transition to the Normal state upon the occurrence of SMI#, BINIT#, 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 AutoHALT 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 AutoHALT Power Down state.

When the system de-asserts the STPCLK# interrupt, the processor will return execution to the

HALT state.

While in AutoHALT Power Down state, the processor will process FSB snoops and interrupts.

Figure 6-1. Stop Clock State Machine

STPCLK#

De-asserted

SLP#

De-asserted

1. Normal State

Normal execution.

3. Stop Grant State

BCLK running.

Snoops and interrupts allowed.

5. Sleep State

BCLK running.

No snoops or interrupts allowed.

2. Auto HALT Power Down State

BCLK running.

Snoops and interrupts allowed.

4. HALT/Grant Snoop State

BCLK running.

Service snoops to caches.

STPCLK#

Asserted

SLP#

Asserted

Snoop

Event

Occurs

Snoop

Event

Serviced

HALT Instruction and

HALT Bus Cycle Generated

INIT#, BINIT#, INTR, NMI,

SMI#, RESET#

Snoop Event Serviced

Snoop Event Occurs

STPC

LK# As

serted

STPCL

K# De-a

sserted

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