Datasheet

Functional Description
Intel® Xeon® Processor D-1500 Product Family 159
Datasheet - Volume 1 of 4: Integrated Platform Controller Hub
March 2015
provide incrementally more aggressive actions. Aux and Aux2
trip points are fully Software programmable during system run-
time. Aux2 trip point is set below the Aux temperature trip point.
Hot Temperature Trip Point
This trip point may be set dynamically if desired and provides 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. Hot trip does
not provide any default hardware based thermal throttling, and
is available only as a customer configurable interrupt when
Tj,max has been reached.
Catastrophic Trip Point
This trip point is set at the temperature at which Intel® Xeon®
Processor D-1500 Product Family must be shut down
immediately without any software support. The catastrophic trip
point must correspond to a temperature ensured to be
functional in order for the interrupt generation and Hardware
response. Hardware response using THRMTRIP# would be an
unconditional transition to S5. The catastrophic transition to the
S5 state does not enforce a minimum time in the S5 state. It is
assumed that the S5 residence and the reboot sequence cools
down the system. If the catastrophic condition remains when
the catastrophic power down enable bit is set by BIOS, then the
system will re-enter S5.
Thermometer Mode
The thermometer is implemented using a counter that starts at
0 and increments during each sample point until the comparator
indicates the temperature is above the current value. The value
of the counter is loaded into a read-only register (Thermal
Sensor Thermometer Read) when the comparator first trips.
3.21.1.1.1 Recommended Programming for Available Trip Points
There may be a ±2 °C offset due to thermal gradient between the hot-spot and the
location of the thermal sensor. Trip points should be programmed to account for this
temperature offset between the hot-spot Tj,max and the thermal sensor.
Aux Trip Points should be programmed for software and firmware control using
interrupts.
Hot Trip Point should be set to throttle at 108 °C (Tj,max) due to DTS trim accuracy
adjustments. Hot trip points should also be programmed for a software response.
Catastrophic Trip Point should be set to halt operation to avoid maximum Tj of about
120 °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.