Intel W3690 AT80613005931AB Data Sheet

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A transition to the Grant Snoop state will occur when the processor detects a snoop on 
the FSB (see 

While in the Stop-Grant State, SMI#, INIT#, 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. 

Extended Stop Grant is a low power state entered when the STPCLK# signal is asserted 

and Extended Stop Grant has been enabled via the BIOS. 

The processor will automatically transition to a lower frequency and voltage operating 

point before entering the Extended Stop Grant state. When entering the low power 

state, the processor will first switch to the lower bus ratio and then transition to the 

lower VID.  

The processor exits the Extended Stop Grant state when a break event occurs. When 

the processor exits the Extended Stop Grant state, it will resume operation at the lower 

frequency, transition the VID to the original value, and then change the bus ratio back 

to the original value.

 

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, 

Stop

 Grant Snoop State and Extended HALT Snoop State, 

and Extended 

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 returns to the Stop Grant state or HALT 
Power Down state, as appropriate.

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 

or Extended Stop Grant state. 

While in the 

Extended HALT Snoop State 

or Extended Stop Grant Snoop State, 

snoops are handled 

the same way as in the HALT Snoop State or Stop Grant Snoop State. After the snoop is 

serviced, the processor will return to the Extended HALT state or 

Extended Stop Grant 

state.