Intel 2 Duo T7300 LE80537GG0414M Manual De Usuario
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LE80537GG0414M
Thermal Specifications and Design Considerations
86
Datasheet
junction temperature within the maximum specification, the system must initiate an
orderly shutdown to prevent damage. If the processor enters one of the above low
power states with PROCHOT# already asserted, PROCHOT# will remain asserted until
the processor exits the low power state and the processor junction temperature drops
below the thermal trip point.
If Intel Thermal Monitor automatic mode is disabled, the processor will be operating out
of specification. Regardless of enabling the automatic or on-demand modes, in the
event of a catastrophic cooling failure, the processor will automatically shut down when
the silicon has reached a temperature of approximately 125°C. At this point the
THERMTRIP# signal will go active. THERMTRIP# activation is independent of processor
activity and does not generate any bus cycles. When THERMTRIP# is asserted, the
processor core voltage must be shut down within the time specified in
.
In all cases the Intel Thermal Monitor feature must be enabled for the processor to
remain within specification.
5.1.4
Digital Thermal Sensor
The processor also contains an on die Digital Thermal Sensor (DTS) that can be read
via an MSR (no I/O interface). Each core of the processor will have a unique digital
thermal sensor whose temperature is accessible via the processor MSRs. The DTS is the
preferred method of reading the processor die temperature since it can be located
much closer to the hottest portions of the die and can thus more accurately track the
die temperature and potential activation of processor core clock modulation via the
Intel Thermal Monitor. The DTS is only valid while the processor is in the normal
operating state (the Normal package level low power state).
Unlike traditional thermal devices, the DTS will output a temperature relative to the
maximum supported operating temperature of the processor (T
J,max
). It is the
responsibility of software to convert the relative temperature to an absolute
temperature. The temperature returned by the DTS will always be at or below T
J,max
.
Catastrophic temperature conditions are detectable via an Out Of Spec status bit. This
bit is also part of the DTS MSR. When this bit is set, the processor is operating out of
specification and immediate shutdown of the system should occur. The processor
operation and code execution is not guaranteed once the activation of the Out of Spec
status bit is set.
The DTS-relative temperature readout corresponds to the Intel Thermal Monitor 1/Intel
Thermal Monitor 2 trigger point. When the DTS indicates maximum processor core
temperature has been reached, the Intel Thermal Monitor 1 or 2 hardware thermal
control mechanism will activate. The DTS and Intel Thermal Monitor 1/Intel Thermal
Monitor 2 temperature may not correspond to the thermal diode reading because the
thermal diode is located in a separate portion of the die and thermal gradient between
the individual core DTS. Additionally, the thermal gradient from DTS to thermal diode
can vary substantially due to changes in processor power, mechanical and thermal
attach, and software application. The system designer is required to use the DTS to
guarantee proper operation of the processor within its temperature operating
specifications.
Changes to the temperature can be detected via two programmable thresholds located
in the processor MSRs. These thresholds have the capability of generating interrupts
via the core's local APIC. Refer to the Intel® 64 and IA-32 Architectures Software
Developer’s Manual for specific register and programming details.