Intel G640T CM8062301002204 User Manual

Datasheet, Volume 2

257

This register describes the thresholds for the memory thermal management in the MC.

• The warm threshold defines when self-refresh is at double rate. Throttling can also 

be applied at this threshold based on the configuration in the MC.

• The hot threshold defines what the acceptable limit of the temperature is. When 

this threshold is crossed, severe throttling takes place. The self refresh is also at 
double rate.

• The critical threshold continues to throttle a the hot threshold value while also 

generating an additional interrupt for other platform thermal management 

Cold Temperature:

TEMP < WARM_TH

Warm Temperature:

TEMP  WARM_TH & TEMP < HOT_TH

Hot Temperature:

TEMP  HOT_TH & TEMP < CRITICAL_TH

Critical Temperature:

TEMP  CRITICAL_TH

This register is read by PCODE only during Reset Phase 4.

NOTE: The threshold values must be programmed such that: 

WARM_TH < HOT_TH < CRITICAL_TH

31:16

RO

0h

15

RW

1b

Uncore

Hot Threshold Enable (HOT_THRESHOLD_ENABLE)
This bit must be set to allow the hot threshold.

14:8

RW

1010101b

Uncore

Hot Threshold (HOT_THRESHOLD)
This threshold defines what is the acceptable temperature 

limitation. When this threshold is crossed, severe throttling takes 

place. The self refresh is also at double rate.

7

RW

1b

Uncore

Warm Threshold Enable (WARM_THRESHOLD_ENABLE)
This bit must be set to allow the warm threshold.

6:0

RW

1010000b

Uncore

Warm Threshold (WARM_THRESHOLD)
The warm temperature threshold defines when the self refresh is at 

double rate. Throttling can also be applied at this threshold based 

on the configuration in the MC.