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68 Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families
Datasheet Volume One
Note: The 3-byte PCI configuration address and write data field defined in Figure 2-48 are sent in standard PECI ordering with
LSB first and MSB last.
2.5.2.10.2 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.
The PECI client response can also vary depending on the address and data. It will
respond with a passing completion code if it successfully submits the request to the
appropriate location and gets a response.
Figure 2-48. WrPCIConfigLocal()
Byte
Definition
01 2
FCS
3
Completion
Code
AW FCS
12
Byte #
FCS
13 14 15
Write Length
{0x07, 0x08, 0x0a}
Host ID[7:1] &
Retry[0]
4
8
Read Length
0x01
56
Cmd Code
0xe5
10
11
Client Address
9
LSB PCI Configuration Address MSB
LSB Data (1, 2 or 4 bytes) MSB
7
Table 2-14. WrPCIConfigLocal() Response Definition
Response Meaning
Bad FCS Electrical error or AW FCS failure
Abort FCS Illegal command formatting (mismatched RL/WL/Command Code)
CC: 0x40 Command passed, data is valid.
CC: 0x80 Response timeout. The processor was 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: 0x82 The processor hardware resources required to service this command are in a low power
state. Retry may be appropriate after modification of PECI wake mode behavior if
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.