Intel 1.00 GHz YK80542KC0013M Benutzerhandbuch

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ETM is a new feature that has been added to the Itanium 2 processor. ETM uses a thermal sensing 
device on the die to monitor a thermal entry point, indicating dangerous operation exceeding the 
thermal specification. Once the thermal sensing device observes the temperature rise above the 
thermal entry point, the processor will enter a low power mode of execution and notify the system 
by sending a Correctable Machine Check Interrupt (CMCI). The Itanium 2 processor will remain in 
this low power mode until the temperature decreases below the thermal entry point and remains for 
approximately one second, at which point the it will send an another CMCI and resume normal 
operation. If the temperature cannot be reduced and continues to rise to critical levels, the 
processor will assert the THRMTRIP# signal. The ETM feature may be disabled through the PAL. 

The Itanium 2 processor protects itself from catastrophic overheating by use of an internal thermal 
sensor. The sensor trip point is set well above the normal operating temperature to ensure that there 
are no false trips. The Itanium 2 processor will stop all execution when the junction temperature 
exceeds a safe operating level.

Data will be lost if the Itanium 2 processor goes into thermal trip (signaled to the system by the 
THRMTRIP# pin).

Once thermal trip is activated, the Itanium 2 processor remains stopped until RESET# is asserted. 
The processor case temperature must drop below the specified maximum before issuing a reset to 
the processor. Please see 

 for details on case temperature.

See 

for the case temperature specifications for the Itanium 2 processor. The case 

temperature is defined as the temperature measured at the center of the top surface of the IHS. 

Data may be lost if the case temperature exceeds the specified maximum.

 contains dimensions for the thermocouple location on the Itanium 2 processor package. 

This is the recommended location for placement of a thermocouple for case temperature 
measurement.

Tcase

Case Temperature

900 MHz

5

85

°C

1.0 GHz

5

85

°C

1.3 GHz

5

83

°C

1.4 GHz

5

83

°C

1.5 GHz

5

83

°C

1.6 GHz

5

83

°C

1.66 GHz

5

83

°C