Table of Contents
Advertisement
Notes: (*) TM2 is the recommended mode for the Intel Pentium M processor.
TM2 is not supported on boards with Celeron® M processor.
Thermal Monitor supports two modes to activate the TCC: Automatic and On-Demand mode. The Intel
Thermal Monitor Automatic Mode must be enabled via BIOS for the processor to be operating within
specification. Automatic mode does not require any additional hardware, software drivers, or interrupt
handling routines.
23.2.2
C atastrophic Thermal Protection
1 4 5 B
The Intel Pentium M processor supports the THERMTRIP# signal for catastrophic thermal protection.
In the event of a catastrophic cooling failure, the processor will automatically shut down when the
silicon has reached the absolute maximum temperature. At this point the system BUS signal THERMTRIP#
will go active. THERMTRIP# activation is independent of processor activity and does not generate any bus
cycles. The system will immediately shut down.
Absolute maximum temperature activating THERMTRIP#:
For more details, see Chapter 5.1.2 of the Intel Pentium M Processor Datasheet.
23.3
P rocessor Performance Control
9 4 B
The Pentium M processor can run in different performance states (multiple frequency/voltage operating
points). The CPU performance can be altered while the computer is functioning. This allows the
processor to run at different core frequencies and voltages depending on CPU thermal state and OS
policy.
Microsoft Windows XP includes built-in processor performance control to operate the processor more
efficiently when it is not fully utilized. Win2k, WinME and Win9x do not support processor performance
control. Special software is required for Operating Systems that are not capable of processor
performance control.
In Windows, the processor performance control policy is linked to the Power Scheme setting in the
control panel power option applet.
Notes: Windows always runs at the highest performance state when the "Home/Office" or the "Always On" power
scheme is selected. For more detailed information about processor performance control, see:
- Chapter 8 of the ACPI Specification Revision 2.0c
- Windows platform design notes
23.4
T hermal Management
9 5 B
ACPI allows the OS to play a role in the thermal management of the system. With the OS in control of the
operating environment, cooling decisions can be made based on the application load on the CPU and the
thermal heuristics of the system.
The ACPI thermal solution on coolMONSTER/PM supports three cooling policies and their trip points:
Kontron User's Guide
coolMonster/PM
23 22BImportant Technology Information
125°C
50
Advertisement
Table of Contents
