Datasheet
63
Thermal Management
5.2.1.5
THERMTRIP# Signal
Regardless of enabling the automatic or on-demand modes, in the event of a
catastrophic cooling failure, the processor will automatically shut down when the silicon
has reached an elevated temperature that risks physical damage to the processor. At
this point the THERMTRIP# signal will go active. THERMTRIP# activation is independent
of processor activity and does not generate any bus cycles.
5.2.1.6
Critical Temperature Detection
Critical Temperature detection is performed by monitoring the processor temperature
and temperature gradient. This feature is intended for graceful shutdown before the
THERMTRIP# is activated. If the processor's Adaptive Thermal Monitor is triggered and
the temperature remains high, a critical temperature status and sticky bit are latched in
the thermal status MSR register and also generates a thermal interrupt if enabled. The
assertion of critical temperature bit indicates that processor can no longer be assumed
to be working reliably.For more details on the interrupt mechanism, refer to the
Intel®
64 and IA-32 Architectures Software Developer's Manuals.
5.2.2
Integrated Graphics and Memory Controller Thermal
Features
The integrated graphics and memory controller provides the following features for
monitoring the integrated graphics and memory controller temperature and triggering
thermal management:
•
One internal digital thermal sensor
•
Hooks for an external thermal sensor mechanism which can either be TS-on-DIMM
or TS-on-Board
The integrated graphics and memory controller has implemented several silicon level
thermal management features that can lower both integrated graphics and memory
controller and DDR3 power during periods of high activity. As a result, these features
can help control temperature and help prevent thermally induced component failures.
These features include:
•
Bandwidth throttling triggered by memory loading
•
Bandwidth throttling triggered by integrated graphics and memory controller
heating
•
THERMTRIP# support
•
Render Thermal Throttling
5.2.2.1
Internal Digital Thermal Sensor
The integrated graphics and memory controller incorporates one on-die digital thermal
sensor for thermal management. The thermal sensor may be programmed to cause
hardware throttling and/or software interrupts. Hardware throttling includes render
thermal throttling and main memory programmable throttling thresholds. Sensor trip
