Features
86 Datasheet
6.2.4 Extended HALT Snoop or HALT Snoop State,
Stop Grant Snoop State
The Extended HALT Snoop State is used in conjunction with the new Extended HALT
state. If Extended 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 Extended 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 Extended HALT Snoop State
The Extended HALT Snoop State is the default Snoop State when the Extended HALT
state is enabled via the BIOS. The processor will remain in the lower bus ratio and VID
operating point of the Extended HALT state.
While in the Extended 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 Extended
HALT state.
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