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54 Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families
Datasheet Volume One
2.5.2.6.21 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. 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 2.5.7.3.
2.5.2.6.22 Thermally Constrained Time Read
This features allows the PECI host to access the total time for which the processor has
been operating in a lowered power state due to TCC activation. The returned data
includes the time required to ramp back up to the original P-state target after TCC
activation expires. This timer does not include TCC activation as a result of an external
assertion of PROCHOT_N. This is tracked by a 32-bit counter with a resolution of 1mS
per count that rolls over or wraps around. On the processor PECI clients, the only logic
that can be thermally constrained is that supplied by VCC.
2.5.2.6.23 Current Limit Read
This read returns the current limit for the processor VCC power plane in 1/8A
increments. Actual current limit data is contained only in the lower 13 bits of the
response data. The default return value of 0x438 corresponds to a current limit value
of 135A.
Figure 2-31. 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 2-32. Thermal Averaging Constant Write / Read
Thermal Averaging Constant
RESERVED
4
31
PECI Temperature
Averaging Constant
3
0