LGA775 Socket Heatsink Loading
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Thermal and Mechanical Design Guidelines
activation of the thermal control circuit. This data is used to derive the TDP targets
published in the processor datasheet.
A system designed to meet the thermal profile at TDP and T
C-MAX
values published in
the processor datasheet greatly reduces the probability of real applications causing the
thermal control circuit to activate under normal operating conditions. Systems that do
not meet these specifications could be subject to more frequent activation of the
thermal control circuit depending upon ambient air temperature and application power
profile. Moreover, if a system is significantly under designed, there is a risk that the
Thermal Monitor feature will not be capable of maintaining a safe operating
temperature and the processor could shutdown and signal THERMTRIP#.
For information regarding THERMTRIP#, refer to the processor datasheet and to
Section
4.2.8 of this Thermal Design Guidelines.
4.2.7
Operating System and Application Software
Considerations
The Thermal Monitor feature and its thermal control circuit work seamlessly with ACPI
compliant operating systems. The Thermal Monitor feature is transparent to
application software since the processor bus snooping, ACPI timer, and interrupts are
active at all times.
4.2.8
THERMTRIP# Signal
In the event of a catastrophic cooling failure, the processor will automatically shut
down when the silicon temperature has reached its operating limit. At this point the
system bus signal THERMTRIP# goes active and power must be removed from the
processor. THERMTRIP# activation is independent of processor activity and does not
generate any bus cycles. Refer to the processor datasheet for more information about
THERMTRIP#.
The temperature where the THERMTRIP# signal goes active is individually calibrated
during manufacturing. The temperature where THERMTRIP# goes active is roughly
parallel to the thermal profile and greater than the PROCHOT# activation
temperature. Once configured, the temperature at which the THERMTRIP# signal is
asserted is neither re-configurable nor accessible to the system.
4.2.9
Cooling System Failure Warning
It may be useful to use the PROCHOT# signal as an indication of cooling system
failure. Messages could be sent to the system administrator to warn of the cooling
failure, while the thermal control circuit would allow the system to continue
functioning or allow a normal system shutdown. If no thermal management action is
taken, the silicon temperature may exceed the operating limits, causing THERMTRIP#
to activate and shut down the processor. Regardless of the system design
requirements or thermal solution ability, the Thermal Monitor feature must still be
enabled to ensure proper processor operation.
Содержание QX68000 Core 2 Extreme
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