AC82GL40-SLB95 datasheet(13/98 Pages) INTEL

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Datasheet

Low Power Features

2.1.1.3

C1/MWAIT Powerdown State

C1/MWAIT is a low-power state entered when the processor core executes the MWAIT

instruction. Processor behavior in the C1/MWAIT state is identical to the C1/AutoHALT

state except that there is an additional event that can cause the processor core to

return to the C0 state: the Monitor event. See the Intel® 64 and IA-32 Intel®

Architecture Software Developer's Manual, Volume 2A/2B: Instruction Set Reference

for more information.

2.1.1.4

Core C2 State

The core of the processor can enter the C2 state by initiating a P_LVL2 I/O read to the

P_BLK or an MWAIT(C2) instruction, but the processor does not issue a Stop Grant

Acknowledge special bus cycle unless the STPCLK# pin is also asserted.

The processor in C2 state processes only the bus snoops. The processor enters a

snoopable sub-state (not shown in Figure 2) to process the snoop and then return to

the C2 state.

2.1.1.5

Core C3 State

Core C3 state is a very low-power state the processor core can enter while maintaining

context. The core of the processor can enter the C3 state by initiating a P_LVL3 I/O

read to the P_BLK or an MWAIT(C3) instruction. Before entering the C3 state, the

processor core flushes the contents of its L1 cache into the processor’s L2 cache.

Except for the caches, the processor core maintains all its architectural state in the C3

state. The Monitor remains armed if it is configured. All of the clocks in the processor

core are stopped in the C3 state.

Because the core’s caches are flushed, the processor keeps the core in the C3 state

when the processor detects a snoop on the FSB. The processor core transitions to the

C0 state upon the occurrence of a Monitor event, SMI#, INIT#, LINT[1:0] (NMI, INTR),

or FSB interrupt message. RESET# causes the processor core to immediately initialize

itself.

2.1.1.6

Core C4 State

Individual cores of the dual-core processor that have C4 can enter the C4 state by

initiating a P_LVL4 I/O read to the P_BLK or an MWAIT(C4) instruction. The processor

core behavior in the C4 state is nearly identical to the behavior in the C3 state. The

only difference is that if both processor cores are in C4, the central power management

logic will request that the entire processor enter the Deeper Sleep package low-power

state (see Section 2.1.2.6)

2.1.2

Package Low-Power States

Package level low-power states are applicable to the processor.

2.1.2.1

Normal State

This is the normal operating state for the processor. The processor enters the Normal

state when the core is in the C0, C1/AutoHALT, or C1/MWAIT state.

2.1.2.2

Stop-Grant State

When the STPCLK# pin is asserted the core of the processor enters the Stop-Grant

state within 20 bus clocks after the response phase of the processor-issued Stop Grant

Acknowledge special bus cycle. When the STPCLK# pin is deasserted the core returns

to the previous core low-power state.

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