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Intel® Xeon® Processor E5-1600 v2/E5-2600 v2 Product Families 53
Datasheet Volume One of Two
Interfaces
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.
2.5.2.6.20 Package Thermal Status Read / Clear
The Thermal Status Read provides information on package level thermal status. Data
includes:
• Thermal Control Circuit (TCC) activation
• Bidirectional PROCHOT_N signal assertion
•Critical Temperature
Both status and sticky log bits are managed in this status word. All sticky log bits are
set upon a rising edge of the associated status bit and the log bits are cleared only by
Thermal Status reads or a processor reset. A read of the Thermal Status word always
includes a log bit clear mask that allows the host to clear any or all of the log bits that
it is interested in tracking.
A bit set to ‘0’ in the log bit clear mask will result in clearing the associated log bit. If a
mask bit is set to ‘0’ and that bit is not a legal mask, a failing completion code will be
returned. A bit set to ‘1’ is ignored and results in no change to any sticky log bits. For
example, to clear the TCC Activation Log bit and retain all other log bits, the Thermal
Status Read should send a mask of 0xFFFFFFFD.
Figure 2-30. Temperature Target Read
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