Intel X5472 Mechanical Design Guidelines - Page 25

TCONTROL Definition, TCONTROL

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Thermal/Mechanical Reference Design above, the case-to-ambient resistance represents the slope of the line and the processor local ambient temperature represents the y-axis intercept. Hence the TCASE_MAX value of a specific solution can be calculated at TDP. Once this point is determined, the line can be extended to Power (P) = 0W representing the Thermal Profile of the specific solution. If that line stays at or below the Thermal Profile specification, then that particular solution is deemed as a compliant solution. 2.2.6 TCONTROL Definition TCONTROL can be described as a trigger point for fan speed control implementation. The processor TCONTROL value provided by the Digital Thermal Sensor is relative and no longer absolute. The TCONTROL value is now defined as a relative value to the TCC activation set point (i.e. PECI Count = 0), as indicated by PROCHOT#. Figure 2-8 depicts the interaction between the TCONTROL value and Digital Thermal Sensor value. Figure 2-8. TCONTROL Value and Digital Thermal Sensor Value Interaction Digital Thermal Sensor Temperature 0 Tcontrol = -5 -10 Temperature -20 -30 -40 Time The value for TCONTROL is calibrated in manufacturing and configured for each processor individually. For the Quad-Core Intel® Xeon® Processor 5400 Series, the TCONTROL value is obtained by reading the processor model specific register (IA32_TEMPERATURE_TARGET MSR). Note: There is no TCONTROL_BASE value to sum as previously required on legacy processors. The fan speed control device only needs to read the TOFFSET MSR and compare this to the DTS value from the PECI interface. The equation for calculating TCONTROL is: Equation 2-2.TCONTROL = -TOFFSET Where: TOFFSET = A DTS-based value programmed into each processor during manufacturing that can be obtained by reading the IA32_TEMPERATURE_TARGET MSR. This is a static and a unique value. Refer to the RS - Wolfdale Processor Family BIOS Writer's Guide (BWG) for further details. Quad-Core Intel® Xeon® Processor 5400 Series TMDG 25

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Quad-Core Intel® Xeon® Processor 5400 Series TMDG
25
Thermal/Mechanical Reference Design
above, the case-to-ambient resistance represents the slope of the line and the
processor local ambient temperature represents the y-axis intercept. Hence the
T
CASE_MAX
value of a specific solution can be calculated at TDP. Once this point is
determined, the line can be extended to Power (P) = 0W representing the Thermal
Profile of the specific solution. If that line stays at or below the Thermal Profile
specification, then that particular solution is deemed as a compliant solution.
2.2.6
T
CONTROL
Definition
T
CONTROL
can be described as a trigger point for fan speed control implementation. The
processor T
CONTROL
value provided by the Digital Thermal Sensor is relative and no
longer absolute. The T
CONTROL
value is now defined as a relative value to the TCC
activation set point (i.e. PECI Count = 0), as indicated by PROCHOT#.
Figure 2-8
depicts the interaction between the T
CONTROL
value and Digital Thermal Sensor value.
The value for T
CONTROL
is calibrated in manufacturing and configured for each processor
individually. For the Quad-Core Intel® Xeon® Processor 5400 Series, the T
CONTROL
value is obtained by reading the processor model specific register
(IA32_TEMPERATURE_TARGET MSR).
Note:
There is no T
CONTROL_BASE
value to sum as previously required on legacy processors.
The fan speed control device only needs to read the T
OFFSET MSR
and compare this to
the DTS value from the PECI interface. The equation for calculating T
CONTROL
is:
Equation 2-2.T
CONTROL
= -T
OFFSET
Where:
T
OFFSET
=
A DTS-based value programmed into each processor during
manufacturing that can be obtained by reading the
IA32_TEMPERATURE_TARGET MSR. This is a static and a unique value.
Refer to the
RS - Wolfdale Processor Family BIOS Writer’s Guide (BWG)
for further details.
Figure 2-8.
T
CONTROL
Value and Digital Thermal Sensor Value Interaction
-30
-20
-10
0
-40
Time
Digital Thermal Sensor
Temperature
Tcontrol = -5
Temperature
-30
-20
-10
0
-40
-30
-20
-10
0
-40
Time
Digital Thermal Sensor
Temperature
Tcontrol = -5
Temperature