E2000 datasheet(91/104 Pages) INTEL

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Datasheet

Features

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 will support this feature will be provided in

future releases of the Intel® Pentium® Dual-Core Desktop Processor E2000 Series

Specification Update when available.

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 22. Enhanced Intel SpeedStep Technology enables

real-time dynamic switching between frequency and voltage points. It alters the

performance of the processor by changing the bus to core frequency ratio and voltage.

This allows the processor to run at different core frequencies and voltages to best serve

the performance and power requirements of the processor and system. The processor

has hardware logic that coordinates the requested voltage (VID) between the processor

cores. The highest voltage that is requested for either of the processor cores is selected

for that processor package. Note that the front side bus is not altered; only the internal

core frequency is changed. To run at reduced power consumption, the voltage is altered

in step with the bus ratio.

The following are key features of Enhanced Intel SpeedStep Technology:

• Multiple voltage/frequency operating points provide optimal performance at

reduced power consumption.

• Voltage/frequency selection is software controlled by writing to processor MSR’s

(Model Specific Registers), thus eliminating chipset dependency.

— If the target frequency is higher than the current frequency, VCC is incriminated

in steps (+12.5 mV) by placing a new value on the VID signals and the

processor shifts to the new frequency. Note that the top frequency for the

processor can not be exceeded.

— If the target frequency is lower than the current frequency, the processor shifts

to the new frequency and VCC is then decremented in steps (-12.5 mV) by

changing the target VID through the VID signals.

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