Table of Contents
Advertisement
Thermal Management
5.2
Thermal Management Features
This section will cover thermal management features for the processor.
5.2.1
Processor Core Thermal Features
Occasionally the processor core will operate in conditions that exceed its maximum
allowable operating temperature. This can be due to internal overheating or due to
overheating in the entire system. In order to protect itself and the system from thermal
failure, the processor core is capable of reducing its power consumption and thereby its
temperature until it is back within normal operating limits via the Adaptive Thermal
Monitor.
The Adaptive Thermal Monitor can be activated when any core temperature, monitored
by a digital thermal sensor (DTS), exceeds its maximum junction temperature (T
and asserts PROCHOT#. The assertion of PROCHOT# activates the thermal control
circuit (TCC). The TCC will remain active as long as any core exceeds its temperature
limit. Therefore, the Adaptive Thermal Monitor will continue to reduce the processor
core power consumption until the TCC is de-activated.
Caution:
The Adaptive Thermal Monitor must be enabled for the processor to remain within
specification.
5.2.1.1
Adaptive Thermal Monitor
The purpose of the Adaptive Thermal Monitor is to reduce processor core power
consumption and temperature until it operates at or below its maximum operating
temperature. Processor core power reduction is achieved by:
•
Adjusting the operating frequency (via the core ratio multiplier) and input voltage
(via the VID signals).
•
Modulating (starting and stopping) the internal processor core clocks (duty cycle).
The Adaptive Thermal Monitor dynamically selects the appropriate method. BIOS is not
required to select a specific method as with previous-generation processors supporting
Intel® Thermal Monitor 1 (TM1) or Intel® Thermal Monitor 2 (TM2). The temperature
at which the Adaptive Thermal Monitor activates the Thermal Control Circuit is not user
configurable but is software visible in the IA32_TEMPERATURE_TARGET (0x1A2) MSR,
Bits 23:16. The Adaptive Thermal Monitor does not require any additional hardware,
software drivers, or interrupt handling routines. Note that the Adaptive Thermal
Monitor is not intended as a mechanism to maintain processor TDP. The system design
should provide a thermal solution that can maintain TDP within its intended usage
range.
Datasheet
)
j,Max
57
Advertisement
Table of Contents
