QG82945GSE S LB2R Intel, QG82945GSE S LB2R Datasheet - Page 392

• Manufacturer Part Number: QG82945GSE S LB2R
• Description: GRAPHICS AND MEM CNTRL HUB; No. of Pins: 998; Package / Case: FCBGA; Interface Type: PCI, SATA, USB
• Manufacturer: Intel

10.7.1.1.2
10.7.1.2
10.7.1.2.1
10.7.1.2.2
10.7.1.2.3
10.7.1.2.4
392
Thermal Sensor Accuracy
Thermal sensor accuracy (T
132°C. This value is based on product characterization and is not guaranteed by manu-
facturing test.
Software has the ability to program the Tcat, Thot, and Taux trip points, but these trip
points should be selected with consideration for the thermal sensor accuracy and the
quality of the platform thermal solution. Overly conservative (unnecessarily low) tem-
perature settings may unnecessarily degrade performance due to frequent throttling,
while overly aggressive (dangerously high) temperature settings may fail to protect the
part against permanent thermal damage.
Sample Programming Model
Intel reference and driver code do not use the thermal sensor interrupts.
Setting Trip Point for Hot Temperature and Generating an SERR Interrupt
Temperature Rising above the Hot Trip Point
Determining the Current Temperature As Indicated by the Thermometer
Hysteresis Operation
• Program the Thermal Hot Temperature Setting register (THTS).
• In Thermal Sensor Control register (TSC), set thermal sensor enable bit (TSE),
• In the Thermal Interrupt Steering (TIS) register, set the Hot/Aux SMI/SERR
• In Thermal Error Command register (TERRCMD), set the SERR on High bit
• Program the global thermal interrupt enabling registers
• The TERRSTS [High Thermal Sensor Event] is set when SERR interrupt is
• Clear this bit of the TERRSTS register to allow subsequent interrupts of this type to
• Clear the global thermal sensor event bit in the Error Status register
• In thermal sensor status register (TSS), the Hot Trip indicator (HTI) bit is set if this
• In Thermal Sensor Control register (TSC), set thermal sensor enable bit (TSE),
• Read the value in the Thermometer Reading register (TRR). Allow enough time for
• Hysteresis provides a small amount of positive feedback to the thermal sensor
• The digital hysteresis offset is programmable to be 0,1, 2…15, which corresponds
sequencer enable bits (SE), thermal sensor output select bit (TSOS), and the
hysteresis value (if applicable).
steering bit.
generated.
get registered.
condition is still valid by the time the software gets to read the register.
sequencer enable bit (SE), thermal sensor output select bit (TSOS), and the
hysteresis value (if applicable).
the entire thermometer sequence to complete (less than 5 msec in 512 clock
mode, i.e., 5 msec = 512*4*256/100 MHz). Reading is not valid unless
TSS[Sequencer Output Valid] = 1
circuit to prevent a trip point from flipping back and forth rapidly when the
temperature is right at the trip point.
to an offset in the range of approximately 0 to 7°C.
accuracy
), for (G)MCH is ±5°C for temperature range 85°C to
Functional Description
Datasheet