Intel E5-2600 Thermal Averaging Constant Write / Read, Thermally Constrained Time Read, 4 3 2 1

Figure 2-31. Thermal Status Word

31 6 5 4 3 2 1 0

Reserved

Critical Temperature Log

Critical Temperature Status

Bidirectional PROCHOT# Log

Bidirectional PROCHOT#

Status

TCC Activation Log

TCC Activation Status

2.5.2.6.21Thermal Averaging Constant Write / Read

This feature allows the PECI host to control the window over which the estimated processor PECI temperature is filtered. The host may configure this window as a power of two. For example, programming a value of 5 results in a filtering window of 25 or 32 samples. The maximum programmable value is 8 or 256 samples. Programming a value of zero would disable the PECI temperature averaging feature. The default value of the thermal averaging constant is 4 which translates to an averaging window size of 24 or 16 samples. More details on the PECI temperature filtering function can be found in Section 2.5.7.3.

Figure 2-32. Thermal Averaging Constant Write / Read

31	4	3		0
	RESERVED		PECI Temperature
			Averaging Constant
	Thermal Averaging Constant

2.5.2.6.22Thermally Constrained Time Read

This features allows the PECI host to access the total time for which the processor has been operating in a lowered power state due to TCC activation. The returned data includes the time required to ramp back up to the original P-state target after TCC activation expires. This timer does not include TCC activation as a result of an external assertion of PROCHOT_N. This is tracked by a 32-bit counter with a resolution of 1mS per count that rolls over or wraps around. On the processor PECI clients, the only logic that can be thermally constrained is that supplied by VCC.

2.5.2.6.23Current Limit Read

This read returns the current limit for the processor VCC power plane in 1/8A increments. Actual current limit data is contained only in the lower 13 bits of the response data. The default return value of 0x438 corresponds to a current limit value of 135A.

54	Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families
	Datasheet Volume One