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points may also be programmed to generate various interrupts including SCI, SMI,
INTR, and SERR. The internal thermal sensor reports six trip points: Aux0, Aux1, Aux2,
Aux3, Hot, and Catastrophic trip points in order of increasing temperature.
5.2.2.1.1
Aux0, Aux1, Aux2, Aux3 Temperature Trip Points
These trip points may be set dynamically if desired and provides a configurable
interrupt mechanism to allow software to respond when a trip is crossed in either
direction. These auxiliary temperature trip points do not automatically cause any
hardware throttling but may be used by software to trigger interrupts.
5.2.2.1.2
Hot Temperature Trip Point
This trip point is set at the temperature at which the integrated graphics and memory
controller must start throttling. It may optionally enable integrated graphics and
memory controller throttling when the temperature is exceeded. This trip point may
provide an interrupt to ACPI (or other software) when it is crossed in either direction.
Software could optionally set this as an interrupt when the temperature exceeds this
level setting.
5.2.2.1.3
Catastrophic Trip Point
This trip point is set at the temperature at which the integrated graphics and memory
controller must be shut down immediately without any software support. This trip point
may be programmed to generate an interrupt, enable throttling, or immediately shut
down the system (via Halt or via THERMTRIP# assertion). Crossing a trip point in either
direction may generate several types of interrupts.
5.2.2.1.4
Recommended Programming for Available Trip Points
See the integrated graphics and memory controller BIOS Specification for
recommended Trip Point programming. Aux Trip Points (0, 1, 2, 3) should be
programmed for software and firmware control via interrupts. HOT Trip Point should be
set to throttle integrated graphics and memory controller to avoid T
Catastrophic Trip Point should be set to halt operation to avoid maximum Tj of 130°C.
Note:
Crossing a trip point in either direction may generate several types of interrupts. Each
trip point has a register that can be programmed to select the type of interrupt to be
generated. Crossing a trip point is implemented as edge detection on each trip point to
generate the interrupts. Either edge (i.e., crossing the trip point in either direction)
generates the interrupt.
5.2.2.1.5
Thermal Sensor Accuracy (T
The error associated with DTS measurement will not exceed ±5°C within the operating
range. Integrated graphics and memory controller may not operate above T
This value is based on product characterization and is not guaranteed by manufacturing
test.
64
)
accuracy
Thermal Management
of 100°C.
j,max
spec.
j,max
Datasheet
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