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PECI Interface
7.1.4.11.1
Command Format
The RdPCIConfigLocal() format is as follows:
Write Length: 0x05
Read Length: 0x02 (byte), 0x03 (word), 0x05 (dword)
Command: 0xe1
Description: Returns the data maintained in the PCI configuration space within the
processor at the requested PCI configuration address. The Read Length dictates the
desired data return size. This command supports byte, word and dword responses as
well as a completion code. All command responses are prepended with a completion
code that includes additional pass/fail status information. Refer to
details regarding completion codes.
Figure 7-42. RdPCIConfigLocal()
0
Byte #
Client Address
Byte
Definition
Host ID[7:1] &
9
Completion
LSB
Code
The 3-byte PCI configuration address and read data field defined in
sent in standard PECI ordering with LSB first and MSB last.
7.1.4.11.2
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. Exactly what the receiving agent does with
the data or how it responds is up to that agent and is outside the scope of PECI 3.0.
Table 7-14. RdPCIConfigLocal() Response Definition (Sheet 1 of 2)
Response
Bad FCS
Abort FCS
CC: 0x40
CC: 0x80
Thermal/Mechanical Specifications and Design Guide
1
Write Length
0x05
{0x02,0x03,0x05}
4
5
LSB
Retry[0]
10
11
Data (1, 2 or 4 bytes)
Electrical error
Invalid command formatting (mismatched RL/WL/Command Code)
Command passed, data is valid.
Response timeout. The processor was not able to generate the required response in a
timely fashion. Retry is appropriate.
2
3
Read Length
Cmd Code
0xe1
6
PCI Configuration Address
12
Meaning
Section 7.1.7.2
for
7
8
MSB
FCS
13
14
MSB
FCS
Figure 7-42
are
85
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