Datasheet

Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 v2 Product Families 37
Datasheet Volume One of Two
Interfaces
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 2.5.5.2 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.
Figure 2-11. WrPkgConfig()