Intel C2518 FH8065501516710 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

September 2014

Datasheet, Vol. 2 of 3

Order Number: 330061-002US

403

The RdPCIConfigLocal() command provides sideband read access to the entire PCI 

configuration space of the SoC. This command allows access to all of the configuration 

space that can also be accessed in-band using the Enhanced Configuration Access 

Mechanism (ECAM). Using the PECI access mechanism, PECI originators can access the 

SoC configuration space even before the BIOS enumeration of the system PCI busses. 

PECI originators may also conduct a device/function/register enumeration sweep of this 

space by issuing reads in the same manner that the BIOS would. 

 shows 

the RdPCIConfigLocal PECI Proxy Block Write format and 

 

shows the RdPCIConfigLocal PECI Proxy Block Read format. It is not possible to access 

PCI Express* B0,D0,F0 using the RdPCIConfigLocal command.

Slave 

Address

(Write)

Write Address

SMBus 

Command

0x4C

BMC

Command 

Code

PECI Mode 

Command Code

0x62

Byte Count

N

Control Data

0x09

Byte 1

SMBus-PECI 

Handshake 

Control

0x00

Value = 0x00 

No AW FCS Required

Byte 2

PECI Client 

Address

PECI 

Command

0x30

Byte 3

PECI Write 

Length

0x05

Byte 4

PECI Read 

Length

{0x02,0x3,

0x5}

One byte for the Completion 

Code plus byte count of the 

desired data return from the 

accessed Configuration-Space 

Register:
0x02 = One Byte desired.

0x03 = One Word desired.

0x05 = One DWord desired.

Byte 5

RdIPCILocal() 

Command Code

0xe1

Byte 6

Host ID and 

Retry

0x00

Byte 7

PCI Config 

Address Byte 1 

(LSB)

24-bit PCI 

Configuration 

Address

24-Bit PCI Configuration 

Address Mapping:

• Bit[11:0] = Register
• Bit[14:12] = Function
• Bit[19:15] = Device
• Bit[23:20] = Bus

Byte 8 

PCI Config 

Address Byte 2

Byte 9

PCI Config 

Address Byte 3 

(MSB)