Thermal Specifications
Figure 6-10. Revision Number Definition
7
4
0
3
Major Revision#
Minor Revision#
6.3.2.3
GetTemp()
The GetTemp() command is used to retrieve the 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 Thermal Control Circuit
Activation temperature of the PECI device. Note that a value of zero represents the
temperature at which the 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 the Thermal Control Circuit Activation temperature. TCONTROL
may be extracted from the processor by issuing a PECI Mailbox MbxGet() (see
Section 6.3.2.8), or using a RDMSR instruction.
Refer to Section 6.3.6 for details regarding temperature data formatting.
6.3.2.3.1
Command Format
The GetTemp() format is as follows:
Write Length: 1
Read Length: 2
Command: 0x01
Multi-Domain Support: Yes (see Table 6-15)
Description: Returns the current temperature for addressed processor PECI client.
Figure 6-11. GetTemp()
Byte #
0
1
2
3
Write Length
0x01
Read Length
0x02
Cmd Code
0x01
Client Address
Byte
Definition
4
5
6
7
FCS
Temp[7:0]
Temp[15:8]
FCS
Datasheet Volume 1 of 2
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