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36 Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families
Datasheet Volume One
processor PECI clients. All command responses are prepended with a completion code
that contains additional pass/fail status information. Refer to Section 2.5.5.2 for details
regarding completion codes.
Note: The 2-byte parameter field and 4-byte read data field defined in Figure 2-10 are sent in standard PECI ordering with LSB
first and MSB last.
2.5.2.4.2 Supported Responses
The typical client response is a passing FCS, a passing Completion Code and valid data.
Under some conditions, the client’s response will indicate a failure.
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)
Figure 2-10. RdPkgConfig()
Table 2-4. RdPkgConfig() Response Definition
Response Meaning
Bad Write FCS Electrical error
Abort FCS Illegal command formatting (mismatched RL/WL/Command Code)
CC: 0x40 Command passed, data is valid.
CC: 0x80 Response timeout. The processor is not able to generate the required response in a timely
fashion. Retry is appropriate.
CC: 0x81 Response timeout. The processor is not able to allocate resources for servicing this
command at this time. Retry is appropriate.
CC: 0x90 Unknown/Invalid/Illegal Request
CC: 0x91 PECI control hardware, firmware or associated logic error. The processor is unable to
process the request.