Rdpciconfiglocal(); Pci Configuration Address For Local Accesses - Intel BX80619I73820 Design Manual

Table 7-13. RdPCIConfig() Response Definition (Sheet 2 of 2)
Response
CC: 0x80
CC: 0x81
CC: 0x82
CC: 0x90
CC: 0x91
7.1.4.11

RdPCIConfigLocal()

The RdPCIConfigLocal() command provides sideband read access to the PCI
configuration space that resides within the processor. The exact listing of supported
devices, functions and registers can be found in the relevant sections of the Intel
Core™ i7 Processor Family for the LGA-2011 Socket Datasheet, Volume 2. PECI
originators may conduct a device/function/register enumeration sweep of this space by
issuing reads in the same manner that the BIOS would. A response of all 1s may
indicate that the device/function/register is unimplemented even with a 'passing'
completion code. PECI originators can access this space even prior to BIOS
enumeration of the system buses.
PCI configuration addresses are constructed as shown in
band procedures, the Bus number would be used to direct a read or write to the proper
device. Since there is a one-to-one mapping between any given client address and the
bus number, any request made with a bad Bus number is ignored and the client will
respond with all '0's and a 'passing' completion code. All accesses to Bus0, Device[0-7]
and Bus1, Device[8-15] are decoded to registers within the processor.
Figure 7-41. PCI Configuration Address for Local Accesses
23 20 19
Bus
84
Response timeout. The processor was not able to generate the required response in a
timely fashion. Retry is appropriate.
Response timeout. The processor is not able to allocate resources for servicing this
command at this time. Retry is appropriate.
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.
Unknown/Invalid Request
PECI control hardware, firmware or associated logic error. The processor is unable to
process the request.
15 14 12
Device Function
Meaning
Figure
11
Register
Thermal/Mechanical Specifications and Design Guide
PECI Interface
®
7-41. Under normal in-
0