QG82945GSE S LB2R Intel, QG82945GSE S LB2R Datasheet - Page 391

• 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

Functional Description
10.7.1.1
10.7.1.1.1
Table 44.
NOTE: T
Note:
Datasheet
Catastrophic
Hot
Aux1 & Aux0
Zone
die,max
T
T
OEM Decision, based on OEM criteria (for example: Taux =
Temp at which an auxiliary fan should be turned on)
= 105°C
Internal Thermal Sensor Operation
The internal thermal sensor reports four trip points, Aux0, Aux1, Hot, and Catastrophic
trip points in the increasing order of temperature.
Trip Points
Aux0 Temperature Trip Point
This trip point may be set dynamically if desired and provides an interrupt to software
when it is crossed in either direction. When the Aux0 trip point is reached, the chipset
triggers an interrupt to the ACPI BIOS to allow fan control. The Auxiliary0 temperature
trip point does not automatically causes any hardware throttling, but may be used by
SW to trigger interrupt.
Aux1 Temperature Trip Point
This trip point may be set dynamically if desired and provides an interrupt to software
when it is crossed in either direction. The Auxiliary1 temperature trip point does not
automatically cause any hardware throttling, but may be used by SW to trigger
interrupt.
Hot Temperature Trip Point
This trip point is set at the temperature at which the MCH must start throttling. It may
optionally enable hardware render and write throttling when the temperature is
exceeded. The chipset starts throttling once it detects that it is getting into higher
temperatures than expected. This trip point may provide an interrupt to software when
it is crossed in either direction.
Catastrophic Trip Point
This trip point is set at the temperature at which the (G)MCH must be shut down
immediately without any software support. The catastrophic trip point may be
programmed to generate an interrupt, enable throttling, or immediately shut down the
system (via Halt, or via THRMTRIP# assertion).
Crossing a trip point in either direction may generate several types of interrupts. Each
trip point has a register to select what type of interrupt is generated. Crossing a trip
point is implemented as edge detection on each trip point in order to generate the
interrupts. Either edge (i.e., crossing the trip point in either direction) generates the
interrupt.
Recommended Programming for Available Trip Points
Crossing a trip point in either direction may generate several types of interrupts. Each
trip point has a register which can be programmed to select the type of interrupt to be
generated.Crossing a trip point may also initiate hardware-based throttling without
software intervention
Catastrophic
hot
= 110 °C ± 5°C(T
= 132°C ± 5°C (T
Nominal Trip Points
die,max
+ 5°C ± T
die,max
+ 27°C ± T
accuracy
)
accuracy
)
Halt Operation
Initiate Throttling
OEM Decision, based on OEM
criteria
Recommended Action
391