Prochot; Forcepr_N Signal Pin; Ararat Voltage Regulator Thermal Signals - Intel BX80569Q9550 - Core 2 Quad 2.83 GHz Processor Datasheet

will continue to drive THERMTRIP_N and remain stopped. It is recommended to allow
the processor case temperature to drop below the specified design target before issuing
a reset to the processor. Please see
temperature.
Note: In a partitioned system, sockets in the same partition are in the same coherency
domain, so they cannot continue to operate if even one of the processors asserts
THERMTRIP_N and shuts down. Moreover, a cold reset is required to get the part back
up after a THERMTRIP event. Because cold reset will reset all the sockets in the
partition, the other sockets cannot continue running without a reset event.
5.1.7

PROCHOT

The temperature at PROCHOT represents the maximum normal operating temperature
of the processor. PROCHOT_N is asserted when the processor temperature is greater
than or equal to T
PROCHOT_N is a signal from the processor to the platform indicating that the processor
has detected an over-temperature condition and it is taking corrective measures. This
pin is not asserted when FORCEPR_N or VR_THERMALERT_N is asserted unless the
thermal system has detected a PROCHOT condition independent of those input signals.
The condition may occur due to any of the following conditions:
• The thermal environment is outside of the limits defined for full performance
operation.
• The processor power consumption is unbalanced due to very high activity factors in
some cores coupled with very low activity factors in others.
5.1.8

FORCEPR_N Signal Pin

FORCEPR_N is an input pin that will force the processor into one of two modes. The
default mode is the same state as PROCHOT_N. The processor will go into Single Issue
Mode (SIM) and also transition to the voltage and frequency of the lowest supported
P-state. Time limits and CMCI generation are the same as PROCHOT_N. The second
mode, selectable via QR_CSR_IPF_THERM_CONFIG.forcepr_mode, disables SIM and
timer functions while maintaining core frequency and voltage throttling. Both modes
can be disabled via QR_CSR_IPF_THERM_CONFIG.forcepr_disable.
5.1.9

Ararat Voltage Regulator Thermal Signals

The Intel
package allows the Ararat Voltage Regulator to signal to the platform when it
approaches its own thermal limits. The specific signals for this purpose are VR_FAN_N,
VR_THERMALERT_N, and VR_THERMTRIP_N.
The processor does not monitor or respond to the VR_FAN_N and VR_THERMTRIP_N
pins. The response to VR_THERMALERT_N is to force the processor into the same state
as PROCHOT_N. The processor will go into SIM and also transition to the voltage and
frequency of the lowest supported P-state. Time limits and CMCI generation are active.
This response may be disabled via R_CSR_IPF_THERM_CONFIG.vr_thermalert_disable.
138
PROCHOT.
® ®
Itanium Processor 9300 Series and Intel
Section 5.2 and Table 5-3
®
Itanium
® ®
Intel Itanium Processor 9300 Series and 9500 Series Datasheet
Thermal Specifications
for details on the case
®
Processor 9500 Series