Intel Z670 AY80609007293AA データシート
製品コード
AY80609007293AA
Thermal Specifications and Design Considerations
36
Datasheet
PROCHOT#. Refer to the Intel
®
64 and IA-32 Architectures Software Developer's
Manuals.
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 using 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, the PROCHOT# signal is driven by the processor package.
If only TM1 is enabled, PROCHOT# will be asserted and only the core that is above
TCC temperature trip point will have its core clocks modulated. If TM2 is enabled and
the core is above TCC temperature trip point, it will enter the lowest programmed TM2
performance state. It is important to note that Intel recommends that both TM1 and
TM2 be enabled.
When PROCHOT# is driven by an external agent, if only TM1 is enabled on the core,
then the processor core will have the clocks modulated. If TM2 is enabled, then the
processor core will enter the lowest programmed TM2 performance state. It should be
noted that Force TM1 on TM2, enabled using IA-32 Firmware, does not have any
effect on external PROCHOT#. If PROCHOT# is driven by an external agent when
TM1, TM2, and Force TM1 on TM2 are all enabled, then the processor will still apply
only TM2.
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.
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