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64 Intel® Xeon® Processor E5-1600 v2/E5-2600 v2 Product Families
Datasheet Volume One of Two
Note: The 4-byte PCI configuration address and read data field defined in Figure 2-45 are sent in standard PECI ordering with
LSB first and MSB last.
2.5.2.8.2 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.
2.5.2.9 RdPCIConfigLocal()
The RdPCIConfigLocal() command provides sideband read access to the PCI
configuration space that resides within the processor. This includes all processor IIO
and uncore registers within the PCI configuration space as described in the Intel®
Xeon® Processor E5 v2 Product Family Processor Datasheet, Volume Two: Registers
document.
PECI originators may conduct a device/function enumeration sweep of this space by
issuing reads in the same manner that the BIOS would. A response of all 1’s may
indicate that the device/function/register is unimplemented even with a ‘passing’
Figure 2-45. RdPCIConfig()
Table 2-12. RdPCIConfig() Response Definition
Response Meaning
Bad 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 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.