E2000 datasheet(79/104 Pages) INTEL

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Datasheet

Thermal Specifications and Design Considerations

The PROCHOT# signal is asserted when a high temperature situation is detected,

regardless of whether Thermal Monitor or Thermal Monitor 2 is enabled.

It should be noted that the Thermal Monitor 2 TCC cannot be activated via the on

demand mode. The Thermal Monitor TCC, however, can be activated through the use of

the on demand mode.

5.2.3

On-Demand Mode

The processor provides an auxiliary mechanism that allows system software to force

the processor to reduce its power consumption. This mechanism is referred to as “On-

Demand” mode and is distinct from the Thermal Monitor feature. On-Demand mode is

intended as a means to reduce system level power consumption. Systems using the

processor must not rely on software usage of this mechanism to limit the processor

temperature.

The processor provides an auxiliary mechanism that allows system software to force

the processor to reduce its power consumption. This mechanism is referred to as “On-

Demand” mode and is distinct from the Thermal Monitor and Thermal Monitor 2

features. On-Demand mode is intended as a means to reduce system level power

consumption. Systems must not rely on software usage of this mechanism to limit the

processor temperature. If bit 4 of the IA32_CLOCK_MODULATION MSR is set to a ‘1’,

the processor will immediately reduce its power consumption via modulation (starting

and stopping) of the internal core clock, independent of the processor temperature.

When using On-Demand mode, the duty cycle of the clock modulation is programmable

via bits 3:1 of the same IA32_CLOCK_MODULATION MSR. In On-Demand mode, the

duty cycle can be programmed from 12.5% on/ 87.5% off to 87.5% on/ 12.5% off in

12.5% increments. On-Demand mode may be used in conjunction with the Thermal

Monitor; however, if the system tries to enable On-Demand mode at the same time the

TCC is engaged, the factory configured duty cycle of the TCC will override the duty

cycle selected by the On-Demand mode.

Figure 18.

Thermal Monitor 2 Frequency and Voltage Ordering

VID

Frequency

Temperature

TM2

MAX

TM2

VID

TM2

PROCHOT#

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