Thermal/Mechanical Specifications and Design Guide 75
PECI Interface
7.1.2.7.9 Thermal Averaging Constant Write / Read
This feature allows the PECI host to control the window over which the estimated
processor PECI temperature is filtered. The host may configure this window as a power
of two. For example, programming a value of 5 results in a filtering window of 2
5
or 32
samples. The maximum programmable value is 8 or 256 samples. Note that
programming a value of zero would disable the PECI temperature averaging feature.
The default value of the thermal averaging constant is 4 which translates to an
averaging window size of 2
4
or 16 samples. More details on the PECI temperature
filtering function can be found in Section 7-46.
7.1.3 Per Core Temperature Read
This feature allows to read per core temperature from each core, GT or system agent.
The temperature returned is an instantaneous value as opposed to the averaged value
returned by GetTemp() command. Per-core temperature reads are not intended for
system thermal management, but rather for validation or informational purposes.
Figure 7-28. Thermal Status Word
Critical Temperature Log
Critical Temperature Status
Bidirectional PROCHOT# Log
Bidirectional PROCHOT#
Status
TCC Activation Log
TCC Activation Status
31
6543210
Reserved
Figure 7-29. Thermal Averaging Constant Write / Read
Thermal Averaging Constant
RESERVED
431
PECI Temperature
Averaging Constant
3 0
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