Intel 9560 CM8063101049716 Data Sheet

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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 

 for details on the case 

temperature.

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. 

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.

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. 

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. 

The Intel

®

 Itanium

®

 Processor 9300 Series and Intel

®

 Itanium

®

 Processor 9500 Series 

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.