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14-20 Vol. 3
POWER AND THERMAL MANAGEMENT
• PROCHOT# or FORCEPR# Log (bit 3, R/WC0) — Sticky bit that indicates
whether PROCHOT# or FORCEPR# has been asserted by another agent on the
platform since the last clearing of this bit or a reset. If bit 3 = 1, PROCHOT# or
FORCEPR# has been externally asserted. Software may clear this bit by writing a
zero. External PROCHOT# assertions are only acknowledged if the Bidirectional
Prochot feature is enabled.
• Critical Temperature Status (bit 4, RO) — Indicates whether the critical
temperature detector output signal is currently active. If bit
4 = 1, the critical
temperature detector output signal is currently active.
• Critical Temperature Log (bit 5, R/WC0) — Sticky bit that indicates whether
the critical temperature detector output signal has been asserted since the last
clearing of this bit or reset. If bit
5 = 1, the output signal has been asserted.
Software may clear this bit by writing a zero.
• Thermal Threshold #1 Status (bit 6, RO) — Indicates whether the actual
temperature is currently higher than or equal to the value set in Thermal
Threshold #1. If bit
6 = 0, the actual temperature is lower. If bit 6 = 1, the
actual temperature is greater than or equal to TT#1. Quantitative information of
actual temperature can be inferred from Digital Readout, bits 22:16.
• Thermal Threshold #1 Log (bit 7, R/WC0) — Sticky bit that indicates
whether the Thermal Threshold #1 has been reached since the last clearing of
this bit or a reset. If bit 7 = 1, the Threshold #1 has been reached. Software may
clear this bit by writing a zero.
• Thermal Threshold #2 Status (bit 8, RO) — Indicates whether actual
temperature is currently higher than or equal to the value set in Thermal
Threshold #2. If bit 8 = 0, the actual temperature is lower. If bit 8 = 1, the
actual temperature is greater than or equal to TT#2. Quantitative information of
actual temperature can be inferred from Digital Readout, bits 22:16.
• Thermal Threshold #2 Log (bit 9, R/WC0) — Sticky bit that indicates
whether the Thermal Threshold #2 has been reached since the last clearing of
this bit or a reset. If bit
9 = 1, the Thermal Threshold #2 has been reached.
Software may clear this bit by writing a zero.
• Digital Readout (bits 22:16, RO) — Digital temperature reading in 1 degree
Celsius relative to the TCC activation temperature.
0: TCC Activation temperature,
1: (TCC Activation - 1) , etc. See the processor’s data sheet for details regarding
TCC activation.
A lower reading in the Digital Readout field (bits 22:16) indicates a higher actual
temperature.
• Resolution in Degrees Celsius (bits 30:27, RO) — Specifies the resolution
(or tolerance) of the digital thermal sensor. The value is in degrees Celsius. It is
recommended that new threshold values be offset from the current temperature
by at least the resolution
+ 1 in order to avoid hysteresis of interrupt generation.