Intel C2518 FH8065501516710 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

Datasheet, Vol. 2 of 3

September 2014

146

Order Number: 330061-002US

Thermal management control and status registers are distributed between Model 

Specific Registers (MSR) in each core, Power Management Link (PMLink) configuration 

registers, and P-Unit registers. Further register descriptions which control thermal 

management features are found in the Avoton/Rangeley SoC BIOS Writer’s Guide 

(BWG).

The on-die Digital Thermal Sensor (DTS) reports the temperature of the associated 

core as a temperature relative to the factory configured TCC activation temperature 

(i.e., REF_TEMP or T

J-MAX

). There is one DTS per core.

The DTS outputs a temperature (IA32_THERM_STATUS[dig_temp_readout]) relative to 

the maximum supported operating temperature of the SoC which is the PROCHOT_B 

signal activation temperature as configured when the SoC was manufactured. The 

factory configured TCC activation temperature can be read from the 

CPU_THERM_TEMPERATURE[ref_temp].

The system BIOS can convert the relative temperature to an absolute temperature. The 

temperature returned by the digital sensor is dependent on the configuration of 

CPU_THERM_CFG2[therm_valid_range].

The SoC is out of specification anytime the temperature is above PROCHOT. Extreme 

over temperature conditions are detectable via an Out Of Spec status bit. When this bit 

is set, the processor is operating out of specification and an immediate shutdown of the 

system occurs. The system BIOS detects that this bit is set and informs the operating 

system that a critical shutdown is warranted. The CPU operation and code execution 

are not guaranteed once the activation of the Out of Spec status bit is set.

For more information on the conversion of the DTS relative temperature to an absolute 

temperature, refer to the Avoton/Rangeley SoC BIOS Writer’s Guide (BWG).