Intel Itanium 2 Processor manual Case Temperature, Enhanced Thermal Management, Thermal Trip

Thermal Specifications

5.1.2Enhanced Thermal Management

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.

5.1.3Thermal Trip

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.

Warning: 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 Section 5.2 for details on case temperature.

5.2Case Temperature

See Table 5-1for 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.

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

Table 5-1. Case Temperature Specification

Symbol	Parameter	Core	Minimum	Maximum	Unit	Notes
		Frequency
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

Figure 5-2contains 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.

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