Wrpkgconfig() - Intel BX80619I73820 Design Manual

PECI Interface
7.1.2.5

WrPkgConfig()

The WrPkgConfig() command provides write access to the package configuration space
(PCS) within the processor, including various power and thermal management
functions. Typical PCS write services supported by the processor may include power
limiting, thermal averaging constant programming and so on. Refer to
for more details on processor-specific services supported through this command.
7.1.2.5.1 Command Format
The WrPkgConfig() format is as follows:
Write Length: 0x0A
Read Length: 0x01
Command: 0xA5
AW FCS Support: Yes
Description: Writes data to the processor PCS entry as specified by the 'index' and
'parameter' fields. This command supports only dword data writes on the processor
PECI clients. All command responses include a completion code that provides additional
pass/fail status information. Refer to
codes.
Note that the Assured Write FCS (AW FCS) support provides the processor client a high
degree of confidence that the data it received from the host is correct. This is especially
critical where the consumption of bad data might result in improper or non-recoverable
operation.
Figure 7-9. WrPkgConfig()
Byte #
Byte
Definition
The 2-byte parameter field and 4-byte write data field defined in
standard PECI ordering with LSB first and MSB last.
Thermal/Mechanical Specifications and Design Guide
0
Write Length
Client Address
{0x07, 0x08, 0x0a}
4
Host ID[7:1] &
Retry[0]
8
LSB
12
AW FCS
Section 7.1.7.2 for details regarding completion
2
1
Read Length
0x01
6
5
Index LSB
10
9
Data (1, 2 or 4 bytes)
13 14
Completion
FCS
Code
Section 7.1.2.6
3
Cmd Code
0xa5
7
Parameter MSB
11
MSB
15
FCS
Figure 7-9 are sent in
61