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Thermal Specifications

106 Document Number: 318080-002

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 Thermal Monitor is

enabled (note that 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 7200 Series and 7300 Series to activate the TCC. If the

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.

6.2.7 THERMTRIP# Signal

Regardless of whether or not Thermal Monitor or 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 of processor activity and

does not generate any bus cycles. If THERMTRIP# is asserted, processor core voltage

) must be removed within the time frame defined in Table 2-22 and Figure 2-21.

Intel also recommends the removal of V

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