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52 Intel® Xeon® Processor E5-1600 v2/E5-2600 v2 Product Families
Datasheet Volume One of Two
negotiated PECI bit rate. A ‘reset’ or ‘clear’ of this bit or simply not setting the “Wake
on PECI” mode bit could result in a “timeout” response (completion code of 0x82) from
the processor indicating that the resources required to service the command are in a
low power state.
Alternatively, this mode bit can also be read to determine PECI behavior in package
states C3 or deeper.
2.5.2.6.16 Accumulated Run Time Read
This read returns the total time for which the processor has been executing with a
resolution of 1mS per count. This is tracked by a 32-bit counter that rolls over on
reaching the maximum value. This counter activates and starts counting for the first
time at RESET_N de-assertion.
2.5.2.6.17 Package Temperature Read
This read returns the maximum processor die temperature in 16-bit PECI format. The
upper 16 bits of the response data are reserved. The PECI temperature data returned
by this read is an exponential moving average of the maximum sensor temperature
(max [core and uncore sensors]), updated once every ms. The equation for the update
is:
Where: T
n
is the current average value
T
n-1
is the last average value
t
n
is the current maximum sensor temperature
Note: This value is not the value as returned by the PECI GetTemp() described in
Section 2.5.2.3.
2.5.2.6.18 Per Core DTS Temperature Read
This feature enables the PECI host to read the maximum value of the DTS temperature
for any specific core within the processor. Alternatively, this service can be used to read
the System Agent temperature. Temperature is returned in the same format as the
Package Temperature Read described in Section 2.5.2.6.17. Data is returned in relative
PECI temperature format.
Reads to a parameter value outside the supported range will return an error as
indicated by a completion code of 0x90. The supported range of parameter values can
vary depending on the number of cores within the processor. The temperature data
returned through this feature is the instantaneous value and not an averaged value. It
is updated once every 1 mS.
T
n
T
n1–
255
256
------
t
n
256
------
+
×=
Figure 2-29. Package Temperature Read Data
Sign
Bit
14
RESERVED
16
PECI Temperature
(Integer Value)
61531
PECI Temperature
(Fractional Value)
5 0