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AV8062701048800
Thermal Management
Intel
®
Xeon
®
and Intel
®
Core™ Processors For Communications Infrastructure
Datasheet - Volume 1 of 2
May 2012
66
Document Number: 327405
-
001
Unlike traditional thermal devices, the DTS outputs a temperature relative to the
maximum supported operating temperature of the processor (TJ-MAX), regardless of
TCC activation offset. It is the responsibility of software to convert the relative
temperature to an absolute temperature. The absolute reference temperature is
readable in the TEMPERATURE_TARGET MSR 1A2h. The temperature returned by the
DTS is an implied negative integer indicating the relative offset from TJ-MAX. The DTS
does not report temperatures greater than TJ-MAX.
The DTS-relative temperature readout directly impacts the Adaptive Thermal Monitor
trigger point. When a package DTS indicates that it has reached the TCC activation (a
reading of 0x0, except when the TCC activation offset is changed), the TCC activates
and indicates an Adaptive Thermal Monitor event. A TCC activation lowers the IA core
frequency, voltage or both.
Changes to the temperature can be detected via two programmable thresholds located
in the processor thermal MSRs. These thresholds have the capability of generating
interrupts via the core's local APIC. See the Intel
®
64 and IA-32 Architectures Software
Developer's Manuals for specific register and programming details.
7.3.1.2.1
Digital Thermal Sensor Accuracy (Taccuracy)
The error associated with DTS measurement does not exceed ±5°C at TJ-MAX. The
DTS measurement within the entire operating range meets a ±5°C accuracy.
7.3.1.3
PROCHOT# Signal
PROCHOT# (processor hot) is asserted when the processor core temperature has
reached its maximum operating temperature (T
J-MAX
). See
for a timing
diagram of the PROCHOT# signal assertion relative to the Adaptive Thermal Response.
Only a single PROCHOT# pin exists at a package level. When any core arrives at the
TCC activation point, the PROCHOT# signal is asserted. PROCHOT# assertion policies
are independent of Adaptive Thermal Monitor enabling.
Note:
Bus snooping and interrupt latching are active while the TCC is active.
7.3.1.3.1
Bi-Directional PROCHOT#
By default, the PROCHOT# signal is defined as an output only. However, the signal may
be configured as bi-directional. When configured as a bi-directional signal, PROCHOT#
can be used for thermally protecting other platform components should they overheat
as well. When PROCHOT# is driven by an external device:
• The package immediately transitions to the minimum operation points (voltage and
frequency) supported by the processor cores. This is contrary to the internally-
generated Adaptive Thermal Monitor response.
• Clock modulation is not activated.
The TCC remains active until the system deasserts PROCHOT#. The processor can be
configured to generate an interrupt upon assertion and deassertion of the PROCHOT#
signal.
Note:
Toggling PROCHOT# more than once in 1.5ms period results in constant Pn state of the
processor.
7.3.1.3.2
Voltage Regulator Protection
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 cools down as a result of reduced processor power