Intel E2160 Design Guide - Page 31
Operating System and Application Software Considerations, 4.2.8 THERMTRIP# Signal
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Thermal Management Logic and Thermal Monitor Feature-Intel® CoreTM 2 Duo E6400, E4300, and Intel® Pentium® Dual-Core E2160 Processor 4.2.7 4.2.8 4.2.9 4.2.10 power profile. Moreover, if a system is significantly under designed, there is a risk that the Thermal Monitor feature will not be capable of maintaining a safe operating temperature and the processor could shutdown and signal THERMTRIP#. For information regarding THERMTRIP#, refer to the processor datasheet and to Section 4.2.8. Operating System and Application Software Considerations The Thermal Monitor feature and its thermal control circuit work seamlessly with ACPI compliant operating systems. The Thermal Monitor feature is transparent to the application software since the processor bus snooping, ACPI timer and interrupts are active at all times. THERMTRIP# Signal In the event of a catastrophic cooling failure, the processor will automatically shut down when the silicon temperature has reached its operating limit. At this point, the system bus signal THERMTRIP# goes active and power must be removed from the processor. THERMTRIP# activation is independent of processor activity and does not generate any bus cycles. Refer to the processor datasheet for more information about THERMTRIP#. The temperature where the THERMTRIP# signal goes active is individually calibrated during manufacturing. The temperature where THERMTRIP# goes active is roughly parallel to the thermal profile and greater than the PROCHOT# activation temperature. Once configured, the temperature at which the THERMTRIP# signal is asserted is neither re-configurable nor accessible to the system. Cooling System Failure Warning It may be useful to use the PROCHOT# signal as an indication of cooling system failure. Messages could be sent to the system administrator to warn of the cooling failure, while the thermal control circuit would allow the system to continue functioning or allow a normal system shutdown. If no thermal management action is taken, the silicon temperature may exceed the operating limits, causing THERMTRIP# to activate and shut down the processor. Regardless of the system design requirements or thermal solution ability, the Thermal Monitor feature must still be enabled to ensure proper processor operation. Digital Thermal Sensor The Intel® Core™2 Duo desktop processor E6000 sequence introduces the Digital Thermal Sensor (DTS) as the on-die sensor to use for fan speed control (FSC). The DTS will eventually replace the on-die thermal diode used in previous products. The processor will have both the DTS and thermal diode enabled. The DTS is monitoring the same sensor that activates the TCC (Refer to Section 4.2.2). Readings from the DTS are relative to the activation of the TCC. The DTS value where TCC activation occurs is 0 (zero). The DTS can be accessed by two methods. The first is via a MSR. The value read via the MSR is an unsigned number of degrees C away from TCC activation. The second method which is expected to be the primary method for FSC is via the PECI interface. The value of the DTS when read via the PECI interface is always negative and again is degrees C away from TCC activation. October 2007 Order Number: 315279 - 003US Intel® CoreTM 2 Duo E6400, E4300, and Intel® Pentium® Dual-Core E2160 Processor TDG 31
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