E6000 datasheet(98/122 Pages) INTEL

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Features

Datasheet

6.2.3.2

Extended Stop Grant State

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.

6.2.4

Extended HALT State, HALT Snoop State, Extended Stop

Grant Snoop State, and 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 following sections for details on

HALT Snoop State, Stop Grant Snoop State and Extended HALT Snoop State, and

Extended Stop Grant 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 returns to the Stop Grant state or HALT

Power Down state, as appropriate.

6.2.4.2

Extended HALT Snoop State, Extended Stop Grant Snoop State

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.

6.3

Enhanced Intel® SpeedStep® Technology

The processor supports Enhanced Intel SpeedStep® Technology. This technology

enables the processor to switch between multiple frequency and voltage points, which

results in platform power savings. Enhanced Intel SpeedStep Technology requires

support for dynamic VID transitions in the platform. Switching between voltage/

frequency states is software controlled.

Note:

Not all processors are capable of supporting Enhanced Intel SpeedStep® Technology.

More details on which processor frequencies support this feature is provided in the

Intel® Core™2 Duo Desktop Processor E6000 and E4000 Sequence and Intel® Core™2

Extreme Processor X6800 Specification Update.

Enhanced Intel SpeedStep® Technology creates processor performance states (P-

states) or voltage/frequency operating points. P-states are lower power capability

states within the Normal state as shown in Figure 30. Enhanced Intel SpeedStep®

Technology enables real-time dynamic switching between frequency and voltage

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