Intel 64 and IA-32 Architectures Software Developers Manual Volume 3A, System Programming Guide, Part 1
Vol. 3A 13-13
POWER AND THERMAL MANAGEMENT
• Thermal Status Log (bit 1, R/WC0) — This is a sticky bit that indicates the
history of the thermal sensor high temperature output signal (PROCHOT#).
Bit 1 = 1 if PROCHOT# has been asserted since a previous RESET or the last time
software cleared the bit. Software may clear this bit by writing a zero.
• PROCHOT# or FORCEPR# Event (bit 2, RO) — Indicates whether PROCHOT#
or FORCEPR# is being asserted. If bit 2 = 1, PROCHOT# or FORCEPR# has been
asserted.
• PROCHOT# or FORCEPR# Log (bit3, R/WC0) — Sticky bit that indicates
whether PROCHOT# or FORCEPR# has been asserted since the last clearing of
this bit or a reset. If bit 3 = 1, PROCHOT# or FORCEPR# has been asserted.
Software may clear this bit by writing a zero.
• Out-Of-Spec Status (bit 4, RO) — Indicates whether the overheat detector
output signal is currently active. If bit 4 = 1, the overheat detector output signal
is currently active.
• Out-Of-Spec Status Log (bit 5, R/WC0) — Sticky bit that indicates whether
the overheat 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 the value set in Thermal Threshold #1. If
bit 6 = 0, the actual temperature is lower. If bit 6 = 0, the actual temperature is
greater than or equal to TT#1.
• 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
Figure 13-8. IA32_THERM_STATUS Register
63
0
Reserved
15
Reading Valid
12345810
16222327
Resolution in Deg. Celsius
Digital Readout
Thermal Threshold #2 Log
Thermal Threshold #2 Status
Thermal Threshold #1 Log
Thermal Threshold #1 Status
Out of Spec Status Log
679
3132
Out of Spec Status
PROCHOT# or FORCEPR# Log
PROCHOT# or FORCEPR# Event
Thermal Status Log
Thermal Status