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36 Intel® Xeon® Processor E5-1600 v2/E5-2600 v2 Product Families
Datasheet Volume One of Two
2.5.2.5 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 Section 2.5.2.6
for more details on processor-specific services supported through this command.
2.5.2.5.1 Command Format
The WrPkgConfig() format is as follows:
Write Length: 0x0a(dword)
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 Section 2.5.2.2 for details regarding
completion codes.
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.
CC: 0x91 PECI control hardware, firmware or associated logic error. The processor is unable to
process the request.
CC: 0x93 Pcode MCA - PECI access allowed, but PECI access cannot be completed.
CC: 0x94 Pcode MCA - PECI access allowed and access completes. Will respond with the data along
with the response code.
Table 2-4. RdPkgConfig() Response Definition
Response Meaning