Intel CW8064701487007 Datasheet download pdf (Page 83)

Datasheet, Volume 1 83

Thermal Management

5.6.3.5 THERMTRIP# Signal

Regardless of enabling the automatic or on-demand modes, in the event of a

catastrophic cooling failure, the package will automatically shut down when the silicon

has reached an elevated temperature that risks physical damage to the product. At this

point the THERMTRIP# signal will go active.

5.6.3.6 Critical Temperature Detection

Critical Temperature detection is performed by monitoring the package temperature.

This feature is intended for graceful shutdown before the THERMTRIP# is activated.

However, the processor execution is not ensured between critical temperature and

THERMTRIP#. If the Adaptive Thermal Monitor is triggered and the temperature

remains high, a critical temperature status and sticky bit are latched in the

PACKAGE_THERM_STATUS MSR 1B1h and also generates a thermal interrupt if

enabled. For more details on the interrupt mechanism, refer to the Intel

64 and IA-32

Architectures Software Developer's Manuals.

5.6.4 On-Demand Mode

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

the processor to reduce its power consumption using clock modulation. This

mechanism is referred to as “On-Demand” mode and is distinct from Adaptive Thermal

Monitor and bi-directional PROCHOT#. The processor platforms must not rely on

software usage of this mechanism to limit the processor temperature. On-Demand

Mode can be done using processor MSR or chipset I/O emulation.

On-Demand Mode may be used in conjunction with the Adaptive Thermal Monitor.

However, if the system software 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. If the I/O based and MSR-based On-Demand

modes are in conflict, the duty cycle selected by the I/O emulation-based On-Demand

mode will take precedence over the MSR-based On-Demand Mode.

5.6.4.1 MSR Based On-Demand Mode

If Bit 4 of the IA32_CLOCK_MODULATION MSR is set to a 1, the processor will

immediately reduce its power consumption using modulation of the internal core clock,

independent of the processor temperature. The duty cycle of the clock modulation is

programmable using Bits 3:1 of the same IA32_CLOCK_MODULATION MSR. In this

mode, the duty cycle can be programmed in either 12.5% or 6.25% increments

(discoverable using CPUID). Thermal throttling using this method will modulate each

processor core’s clock independently.

5.6.4.2 I/O Emulation-Based On-Demand Mode

I/O emulation-based clock modulation provides legacy support for operating system

software that initiates clock modulation through I/O writes to ACPI defined processor

clock control registers on the chipset (PROC_CNT). Thermal throttling using this

method will modulate all processor cores simultaneously.

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