Intel Pga478 Data Sheet - Page 67
FORCEPR# Signal Pin, THERMTRIP# Signal Pin
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Thermal Specifications and Design Considerations-Intel® Celeron® Processor 1.66 GHz/1.83 GHz 5.1.7 5.1.8 FORCEPR# Signal Pin The FORCEPR# (force power reduction) input can be used by the platform to cause the Intel® Celeron® Processor 1.66 GHz/1.83 GHz to activate the TCC. If the Thermal Monitor is enabled, the TCC is activated upon the assertion of the FORCEPR# signal. The TCC remains active until the system deasserts FORCEPR#. FORCEPR# is an asynchronous input. FORCEPR# can be used to thermally protect other system components. Using the VR as an example, when the FORCEPR# pin is asserted, the TCC circuit in the processor activates reducing the current consumption of the processor and the corresponding temperature of the VR. It should be noted that assertion of the 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 recommend when the FORCEPR# is asserted by the system. Sustained activation of the FORCEPR# pin may cause noticeable platform performance degradation. THERMTRIP# Signal Pin Regardless of whether or not Thermal Monitor is enabled, in the event of a catastrophic cooling failure, the processor automatically shuts down when the silicon has reached an elevated temperature (refer to the THERMTRIP# definition in Table 11). At this point, the system bus signal THERMTRIP# goes active and stay active as described in Table 11. THERMTRIP# activation is independent of processor activity and does not generate any bus cycles. January 2007 Order Number: 315876-002 Intel® Celeron® Processor 1.66 GHz/1.83 GHz DS 67