Intel Z670 AY80609007293AA Data Sheet
Product codes
AY80609007293AA
Thermal Specifications and Design Considerations
Datasheet
35
Unlike traditional thermal devices, the DTS outputs 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 using an Out of Specification
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 ensured once the activation of the
Out of Specification status bit is set.
The DTS-relative temperature readout corresponds to the Intel® Thermal Monitor
(TM1/TM2) trigger point. When the DTS indicates maximum processor core
temperature has been reached, the TM1 or TM2 hardware thermal control mechanism
will activate. The system designer is required to use the DTS to ensure proper
operation of the processor within its temperature operating specifications.
Changes to the temperature can be detected using two programmable thresholds
located in the processor MSRs. These thresholds have the capability of generating
interrupts using the core's local APIC. Refer to the Intel
®
64 and IA-32 Architectures
Software Developer's Manuals for specific register and programming details.
5.2.2
Out of Specification Detection
Overheat detection is performed by monitoring the processor temperature and
temperature gradient. This feature is intended for graceful shut down before the
THERMTRIP# is activated. If the processor’s TM1 or TM2 are triggered and the
temperature remains high, an “Out Of Specification” status and sticky bit are latched
in the status MSR register and generates thermal interrupt.
5.2.3
Catastrophic Thermal Protection
The processor supports the THERMTRIP# signal for catastrophic thermal protection.
An external thermal sensor should also be used to protect the processor and the
system against excessive temperatures. Even with the activation of THERMTRIP#,
which halts all processor internal clocks and activity, leakage current can be high
enough such that the processor cannot be protected in all conditions without the
removal of power to the processor. If the external thermal sensor detects a potentially
catastrophic processor temperature, or if the THERMTRIP# signal is asserted by the
processor, the V
CC
supply to the processor must be turned off within 500 ms to
prevent permanent silicon damage due to thermal runaway of the processor.
THERMTRIP# functionality is not ensured if the PWRGOOD signal is not asserted.
5.2.4
PROCHOT# Signal Pin
An external signal, PROCHOT# (processor hot), is asserted when the processor die
temperature has reached its maximum operating temperature. If TM1 or TM2 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