Datasheet
Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 v2 Product Families 53
Datasheet Volume One of Two
Interfaces
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.
2.5.2.6.19 Temperature Target Read
The Temperature Target Read allows the PECI host to obtain the target DTS
temperature (T
Prochot
) for PROCHOT_N assertion in degrees Celsius. This is the
minimum temperature at which the processor thermal control circuit (TCC) activates.
The actual temperature of TCC activation may vary slightly between processor units
due to manufacturing process variations. The Temperature Target read also returns the
processor T
CONTROL
value. T
CONTROL
is returned in standard PECI temperature format
and represents the threshold temperature used by the thermal management system
for fan speed control.
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