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Thermal Specifications

100 Intel® Xeon® Processor 7400 Series Datasheet

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 Intel 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.

6.2.5 PROCHOT# Signal

An external signal, PROCHOT# (processor hot) is asserted when the temperature of

either processor die has reached its factory configured trip point. If the Intel Thermal

Monitor is enabled (note that the Intel Thermal Monitor must be enabled for the

processor to be operating within specification), the TCC will be active when PROCHOT#

is asserted. The processor can be configured to generate an interrupt upon the

assertion or de-assertion of PROCHOT#. Refer to the Intel

64 and IA-32 Architectures

Software Developer’s Manual.

PROCHOT# is designed to assert at or a few degrees higher than maximum T

CASE

(as

specified by Thermal Profile) when dissipating TDP power, and cannot be interpreted as

an indication of processor case temperature. This temperature delta accounts for

processor package, lifetime and manufacturing variations and attempts to ensure the

Thermal Control Circuit is not activated below maximum T

CASE

when dissipating TDP

power. There is no defined or fixed correlation between the PROCHOT# trip

temperature, or the case temperature. Thermal solutions must be designed to the

processor specifications and cannot be adjusted based on experimental measurements

of T

CASE

, or PROCHOT#.

6.2.6 FORCEPR# Signal

The FORCEPR# (force power reduction) input can be used by the platform to cause the

Intel® Xeon® Processor 7400 Series to activate the TCC. If the Intel Thermal Monitor

is enabled, the TCC will be activated upon the assertion of the FORCEPR# signal.

Assertion of the FORCEPR# signal will activate TCC for all processor cores. The TCC will

remain active until the system deasserts FORCEPR#. FORCEPR# is an asynchronous

input. FORCEPR# can be used to thermally protect other system components. To use

the VR as an example, when FORCEPR# is asserted, the TCC circuit in the processor

will activate, reducing the current consumption of the processor and the corresponding

temperature of the VR.

It should be noted that assertion of FORCEPR# does not automatically assert

PROCHOT#. As mentioned previously, the PROCHOT# signal is asserted when a high

temperature situation is detected. A minimum pulse width of 500 µs is recommended

when FORCEPR# is asserted by the system. Sustained activation of the FORCEPR#

signal may cause noticeable platform performance degradation.

Refer to the Caneland Platform Design Guide for details on implementing the

FORCEPR# signal feature.

6.2.7 THERMTRIP# Signal

Regardless of whether or not the Intel Thermal Monitor or Intel Thermal Monitor 2 is

enabled, in the event of a catastrophic cooling failure, the processor will automatically

shut down when either die has reached an elevated temperature (refer to the

THERMTRIP# definition in Table 5-1). At this point, the FSB signal THERMTRIP# will go

active and stay active as described in Table 5-1. THERMTRIP# activation is independent

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