PECI Interface
58
Thermal/Mechanical Specifications and Design Guide
7.1.2.3
GetTemp()
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 (T
jmax
). Note that the maximum PECI temperature value of zero
corresponds to the processor T
jmax
. 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 (T
CONTROL
) is also defined as a
negative number below T
jmax
. T
CONTROL
may be extracted from the processor by
issuing a PECI RdPkgConfig() command as described in
or using a
RDMSR instruction. T
CONTROL
application to fan speed control management is defined in
. Refer to
for details regarding PECI temperature data
formatting.
7.1.2.3.1
Command 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.
Example bus transaction for a thermal sensor device located at address 0x30 returning
a value of negative 10 counts is show in
Figure 7-6. GetTemp()
Byte #
Byte
Definition
0
Client Address
1
Write Length
0x01
2
Read Length
0x02
4
FCS
5
Temp[7:0]
6
Temp[15:8]
7
FCS
3
Cmd Code
0x01
Figure 7-7. GetTemp() Example
Byte #
Byte
Definition
0
0x30
1
0x01
2
0x02
4
0xef
5
0x80
6
0xfd
7
0x4b
3
0x01
Содержание BX80619I73820
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