Table of Contents
Advertisement
Thermal Management Logic and Thermal Monitor Feature—Intel
®
®
and Intel
Pentium
Dual-Core E2160 Processor
Once the processor has sufficiently cooled, and a minimum activation time has expired,
the operating frequency and voltage transition back to the normal system operating
point. Transition of the VID code will occur first, in order to insure proper operation
once the processor reaches its normal operating frequency. Refer to
illustration of this ordering.
Figure 8.
Thermal Monitor 2 Frequency and Voltage Ordering
T
TM2
f
MAX
f
TM2
VID
VID
TM2
Refer to the datasheet for more information on Thermal Monitor 2.
4.2.4
Operation and Configuration
To maintain compatibility with previous generations of processors, which have no
integrated thermal logic, the Thermal Control Circuit portion of Thermal Monitor is
disabled by default. During the boot process, the BIOS must enable the Thermal
Control Circuit. Thermal Monitor must be enabled to ensure proper processor
operation.
The Thermal Control Circuit feature can be configured and monitored in a number of
ways. OEMs are required to enable the Thermal Control Circuit while using various
registers and outputs to monitor the processor thermal status. The Thermal Control
Circuit is enabled by the BIOS setting a bit in an MSR (model specific register).
Enabling the Thermal Control Circuit allows the processor to attempt to maintain a safe
operating temperature without the need for special software drivers or interrupt
handling routines. When the Thermal Control Circuit has been enabled, processor
power consumption will be reduced after the thermal sensor detects a high
temperature, i.e., PROCHOT# assertion. The Thermal Control Circuit and PROCHOT#
transitions to inactive once the temperature has been reduced below the thermal trip
point, although a small time-based hysteresis has been included to prevent multiple
PROCHOT# transitions around the trip point. External hardware can monitor
PROCHOT# and generate an interrupt whenever there is a transition from active-to-
inactive or inactive-to-active. PROCHOT# can also be configured to generate an
October 2007
Order Number: 315279 - 003US
®
Core
Temperature
PROCHOT#
Frequency
Time
®
TM
Intel
Core
2 Duo E6400, E4300, and Intel
TM
2 Duo E6400, E4300,
VID
®
®
Pentium
Dual-Core E2160 Processor
Figure 8
for an
TDG
29
Advertisement
Table of Contents
