Datasheet

Thermal Specifications
134 Intel
®
Itanium
®
Processor 9300 Series and 9500 Series Datasheet
5.1.1 Digital Thermometer
The Intel
®
Itanium
®
Processor 9300 Series and Intel
®
Itanium
®
Processor 9500 Series
uses a thermal sensing device called Digital Thermometer (DT) to read the values from
the thermal sensors available on the processor die. The DT also compares these values
to a thermal trip point that is hard-wired. Calibration information is used to translate
the DT output to processor temperature in degrees Celsius relative to the PROCHOT
setpoint. DT readout is available in CSR or via SMBus. When it is below the PROCHOT
setpoint the DT readout will have a positive value. The DT has a limited range. It will
report out the value of its upper or lower limits when it has reached the limits and set
QR_CSR_IPF_THERM_STATUS.valid = 1’b0.
5.1.1.1 Thermal Sensor Accuracy Distribution for the Intel
®
Itanium
®
Processor 9300 Series
Table 5-1 shows the processor thermal sensor accuracy with respect to the DT readout
for the an Intel
®
Itanium
®
Processor 9300 Series. The margin of error is relative to
PROCHOT and represents the typical ±3-sigma range. This data is for a large sample of
parts. It should be noted that a particular part should be consistent across the entire
operating range.
Figure 5-1. Intel
®
Itanium
®
Processor 9300 Series and Intel
®
Itanium
®
Processor 9500
Series’ Thermal States
Time
PROCHOT
THERMWARN
THERMTRIP
THERMALERT
Diagram not to scale
T
CONTROL
RELATIVE_TEMP
Max Operating Temperature
Table 5-1. Thermal Sensor Accuracy Distribution for the Intel
®
Itanium
®
Processor 9300
Series (Sheet 1 of 2)
DT Readout
Expected Margin of Error
Relative to PROCHOT
0x83 - 0x80, 0x00 - 0x07 ±1°C
0x08 - 0x0E ±2°C
0x0F - 0x14 ±3°C
0x15 - 0x1B ±4°C
0x1C - 0x22 ±5°C
0x23 - 0x29 ±6°C