Intel Itanium 9140M NE80567KF028009 Manual Do Utilizador

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This chapter provides a description of the thermal features relating to the Dual-Core 
Intel Itanium processor 9000 and 9100 series.

The processor has an internal thermal circuit which senses when a certain temperature 
is reached on the processor core. This circuit is used for controlling various thermal 
states. In addition, an on-chip thermal diode is available for use by the thermal sensing 
device on the processor. 

 shows the relationship between temperature, time, 

and the thermal alert, enhanced thermal management (ETM), and thermal trip points.

 is not intended to show a linear relationship in time or temperature as a 

processor's thermal state advances from one state to the next state when the cooling 

solution fails to control the processor temperature, as this is affected by many factors 

such as cooling solution performance degradation and processor workload variations. 

THRMALERT# is a programmable thermal alert signal which is part of the processor 
system management feature. THRMALERT# is asserted when the measured 
temperature from the processor thermal diode equals or exceeds the temperature 
threshold data programmed in the high temp (THIGH) or low temp (TLOW) registers on 
the sensor. Intel recommends using the upper temperature reference byte listed in the 
Processor Information ROM when programming the THIGH register (see 

 for 

more details). This signal can be used by the platform to implement thermal regulation 
features such as generating an external interrupt to tell the operating system that the 
processor core die temperature is increasing.

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Thermal Alert

Thermal Trip

ETM