Intel E6540 HH80557PJ0534M User Manual

88

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.

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.

VID

Frequency

Temperature

T

TM2

f

MAX

f

TM2

VID

VID

TM2

PROCHOT#