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Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families 37
Datasheet Volume One
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 2.5.5.2 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.
Note: The 2-byte parameter field and 4-byte write data field defined in Figure 2-11 are sent in standard PECI
ordering with LSB first and MSB last.
2.5.2.5.2 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.
Figure 2-11. WrPkgConfig()
Table 2-5. WrPkgConfig() Response Definition (Sheet 1 of 2)
Response Meaning
Bad Write FCS Electrical error or AW FCS failure
Abort FCS Illegal command formatting (mismatched RL/WL/Command Code)
CC: 0x40 Command passed, data is valid.