JG82855GMESL7VN Datasheet, PDF (168/213 Pages) Intel Corporation – Intel® 855GM/855GME Chipset Graphics and Memory Controller Hub (GMCH)

Power and Thermal Management
R
should include an Active-Low Open-Drain signal indicating an Over-Temp condition, which
remains asserted for as long as the Over-Temp Condition exists, and deasserts when temperature
has returned to within normal operating range. This External sensor output will be connected to
the GMCH input (EXTTS_0) and will trigger a Preset Interrupt and/or Read-Throttle on a level-
sensitive basis.
Additional External Thermal sensor’s outputs, for multiple sensors, can be wire-OR'ed together
allow signaling from multiple sensors located physically separately. Software can, if necessary,
distinguish which SO-DIMM(s) is the source of the over-temp through the serial interface.
However, since the SO-DIMM(s) will be located on the same System Memory Bus Data lines,
any GMCH-based Read Throttle will apply equally.
Note:
The use of external sensors that include an internal pull-up resistor on the open-drain Thermal trip
output is discouraged. However, it may be possible depending on the size of the pull-up and the
voltage of the sensor. Please refer to the Intel^® Pentium^® M Processor, Intel^® Celeron^® M
Processor, and Intel^® 855GM/855GME GMCH Platform Design Guide.
7.5.1
Usage
External sensor(s) used for dynamic temperature feedback control:
• Sensor on SO-DIMMs, which can be used to dynamically control read throttling.
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Datasheet