Intel Core 2 Quad Q6700 Datasheet download pdf (Page 78)

Thermal Specifications and Design Considerations

78 Datasheet

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 utilizing the Clovertown processor s 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 19. Thermal Monitor 2 Frequency and Voltage Ordering

VID

Frequency

Temperature

TM2

MAX

TM2

VID

TM2

PROCHOT#

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 97 98

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Intel Core 2 Quad Q6700 Datasheet Page 78