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Features

Datasheet

While in the Stop-Grant State, SMI#, INIT#, BINIT# and LINT[1:0] will be latched by

the processor, and only serviced when the processor returns to the Normal State. Only

one occurrence of each event will be recognized upon return to the Normal state.

While in Stop-Grant state, the processor will process a FSB snoop.

6.2.4

Enhanced HALT Snoop or HALT Snoop State,

Stop Grant Snoop State

The Enhanced HALT Snoop State is used in conjunction with the new Enhanced HALT

state. If Enhanced HALT state is not enabled in the BIOS, the default Snoop State

entered will be the HALT Snoop State. Refer to the sections below for details on HALT

Snoop State, Grant Snoop State and Enhanced HALT Snoop State.

6.2.4.1

HALT Snoop State, Stop Grant Snoop State

The processor will respond to snoop transactions on the FSB while in Stop-Grant state

or in HALT Power Down state. During a snoop transaction, the processor enters the

HALT Snoop State:Stop Grant Snoop state. The processor will stay in this state until the

snoop on the FSB has been serviced (whether by the processor or another agent on the

FSB). After the snoop is serviced, the processor will return to the Stop Grant state or

HALT Power Down state, as appropriate.

6.2.4.2

Enhanced HALT Snoop State

The Enhanced HALT Snoop State is the default Snoop State when the Enhanced HALT

state is enabled via the BIOS. The processor will remain in the lower bus ratio and VID

operating point of the Enhanced HALT state.

While in the Enhanced HALT Snoop State, snoops are handled the same way as in the

HALT Snoop State. After the snoop is serviced the processor will return to the Enhanced

HALT state.

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352 Datasheet(PDF) 88 Page - Intel Corporation