Table 2-2. Minor Revision Number Meaning

Minor Revision

Supported Command Suite

5Ping(), GetDIB(), GetTemp(), WrPkgConfig(), RdPkgConfig(), RdIAMSR(), RdPCIConfigLocal(), WrPCIConfigLocal(), RdPCIConfig(), WrPCIConfig()

6Ping(), GetDIB(), GetTemp(), WrPkgConfig(), RdPkgConfig(), RdIAMSR(),

RdPCIConfigLocal(), WrPCIConfigLocal(), RdPCIConfig(), WrPCIConfig(), WrIAMSR()

For the processor PECI client the Revision Number will return ‘0011 0100b’.

2.5.2.3GetTemp()

The GetTemp() command is used to retrieve the maximum die temperature from a target PECI address. The temperature is used by the external thermal management system to regulate the temperature on the die. The data is returned as a negative value representing the number of degrees centigrade below the maximum processor junction temperature (Tjmax). The maximum PECI temperature value of zero corresponds to the processor Tjmax. This also represents the default temperature at which the processor Thermal Control Circuit activates. The actual value that the thermal management system uses as a control set point (TCONTROL) is also defined as a negative number below Tjmax. TCONTROL may be extracted from the processor by issuing a PECI RdPkgConfig() command as described in Section 2.5.2.4 or using a RDMSR instruction. TCONTROL application to fan speed control management is defined in the Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families Thermal/ Mechanical Design Guide.

Please refer to Section 2.5.7 for details regarding PECI temperature data formatting.

2.5.2.3.1Command Format

The GetTemp() format is as follows: Write Length: 0x01

Read Length: 0x02

Command: 0x01

Description: Returns the highest die temperature for addressed processor PECI client.

Figure 2-8. GetTemp()

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Byte #

0

 

1

 

 

2

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Byte

Client Address

 

Write Length

 

Read Length

 

Cmd Code

 

 

 

0x01

 

 

0x02

 

 

0x01

 

Definition

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

5

 

 

 

6

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FCS

 

Temp[7:0]

 

Temp[15:8]

FCS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

34

Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families

 

Datasheet Volume One

Page 34
Image 34
Intel E5-2600, CM8062101038606, E5-4600, E5-1600 manual GetTemp, Client Address Write Length Read Length, Temp70 Temp158