Tcontrol Definition; Tcontrol Value And Digital Thermal Sensor Value Interaction - Intel 5400 Series Design Manuallines

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
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
T
CONTROL
processor T
longer absolute. The T
activation set point (i.e. PECI Count = 0), as indicated by PROCHOT#.
depicts the interaction between the T
Figure 2-8. T
CONTROL
Digital Thermal Sensor Digital Thermal Sensor
Tcontrol = -5 Tcontrol = -5
The value for T
individually. For the Quad-Core Intel® Xeon® Processor 5400 Series, the T
value is obtained by reading the processor model specific register
(IA32_TEMPERATURE_TARGET MSR).
Note: There is no T
The fan speed control device only needs to read the T
the DTS value from the PECI interface. The equation for calculating T
Equation 2-2.T
CONTROL
Where:
T
OFFSET
Quad-Core Intel® Xeon® Processor 5400 Series TMDG
value of a specific solution can be calculated at TDP. Once this point is
Definition
can be described as a trigger point for fan speed control implementation. The
value provided by the Digital Thermal Sensor is relative and no
CONTROL
value is now defined as a relative value to the TCC
CONTROL
Value and Digital Thermal Sensor Value Interaction
0 0 0
-10 -10 -10
-20 -20 -20
-30 -30 -30
-40 -40 -40
is calibrated in manufacturing and configured for each processor
CONTROL
value to sum as previously required on legacy processors.
CONTROL_BASE
= -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.
value and Digital Thermal Sensor value.
CONTROL
Temperature Temperature
Temperature Temperature
Time Time
OFFSET MSR
Figure 2-8
CONTROL
and compare this to
is:
CONTROL
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