Intel D525 AU80610006225AA User Manual
Product codes
AU80610006225AA
Thermal Specifications and Design Considerations
64
Datasheet
remains high, an “Out Of Spec” status and sticky bit are latched in the status MSR
register and generates thermal interrupt. For more details on the interrupt mechanism,
refer to the RS - Intel® Atom™ Processor D400 and D500 Series BIOS Writer’s Guide.
register and generates thermal interrupt. For more details on the interrupt mechanism,
refer to the RS - Intel® Atom™ Processor D400 and D500 Series BIOS Writer’s Guide.
7.1.5
PROCHOT# Signal Pin
An external signal, PROCHOT# (processor hot), is asserted when the processor die
temperature has reached its maximum operating temperature. If TM1 is enabled, then
the TCC will be active when PROCHOT# is asserted. The processor can be configured to
generate an interrupt upon the assertion or deassertion of PROCHOT#. Refer to the
Intel® 64 and IA-32 Architectures Software Developer's Manuals and RS - Intel®
Atom™ Processor D400 and D500 Series BIOS Writer’s Guide for specific register and
programming details.
temperature has reached its maximum operating temperature. If TM1 is enabled, then
the TCC will be active when PROCHOT# is asserted. The processor can be configured to
generate an interrupt upon the assertion or deassertion of PROCHOT#. Refer to the
Intel® 64 and IA-32 Architectures Software Developer's Manuals and RS - Intel®
Atom™ Processor D400 and D500 Series BIOS Writer’s Guide for specific register and
programming details.
The processor implements a bi-directional PROCHOT# capability to allow system
designs to protect various components from overheating situations. The PROCHOT#
signal is bi-directional in that it can either signal when the processor has reached its
maximum operating temperature or be driven from an external source to activate the
TCC. The ability to activate the TCC via PROCHOT# can provide a means for thermal
protection of system components.
designs to protect various components from overheating situations. The PROCHOT#
signal is bi-directional in that it can either signal when the processor has reached its
maximum operating temperature or be driven from an external source to activate the
TCC. The ability to activate the TCC via PROCHOT# can provide a means for thermal
protection of system components.
Only a single PROCHOT# pin exists at a package level of the processor. When the core's
thermal sensor trips, PROCHOT# signal will be driven by the processor package. If TM1
is enabled, PROCHOT# will be asserted and only the core that is above TCC
temperature trip point will have its core clock modulated. It is important to note that
Intel recommends TM1 to be enabled.
thermal sensor trips, PROCHOT# signal will be driven by the processor package. If TM1
is enabled, PROCHOT# will be asserted and only the core that is above TCC
temperature trip point will have its core clock modulated. It is important to note that
Intel recommends TM1 to be enabled.
PROCHOT# may be used for thermal protection of voltage regulators (VR). System
designers can create a circuit to monitor the VR temperature and activate the TCC
when the temperature limit of the VR is reached. By asserting PROCHOT# (pulled-low)
and activating the TCC, the VR will cool down as a result of reduced processor power
consumption. Bi-directional PROCHOT# can allow VR thermal designs to target
maximum sustained current instead of maximum current. Systems should still provide
proper cooling for the VR and rely on bi-directional PROCHOT# only as a backup in case
of system cooling failure. The system thermal design should allow the power delivery
circuitry to operate within its temperature specification even while the processor is
operating at its TDP. With a properly designed and characterized thermal solution, it is
anticipated that bi-directional PROCHOT# would only be asserted for very short periods
of time when running the most power intensive applications. An under-designed
thermal solution that is not able to prevent excessive assertion of PROCHOT# in the
anticipated ambient environment may cause a noticeable performance loss.
designers can create a circuit to monitor the VR temperature and activate the TCC
when the temperature limit of the VR is reached. By asserting PROCHOT# (pulled-low)
and activating the TCC, the VR will cool down as a result of reduced processor power
consumption. Bi-directional PROCHOT# can allow VR thermal designs to target
maximum sustained current instead of maximum current. Systems should still provide
proper cooling for the VR and rely on bi-directional PROCHOT# only as a backup in case
of system cooling failure. The system thermal design should allow the power delivery
circuitry to operate within its temperature specification even while the processor is
operating at its TDP. With a properly designed and characterized thermal solution, it is
anticipated that bi-directional PROCHOT# would only be asserted for very short periods
of time when running the most power intensive applications. An under-designed
thermal solution that is not able to prevent excessive assertion of PROCHOT# in the
anticipated ambient environment may cause a noticeable performance loss.
Refer to the Pinetrail-D Platform Design Guide for details on implementing the bi-
directional PROCHOT# feature.
directional PROCHOT# feature.
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