Intel C2518 FH8065501516710 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

September 2014

Datasheet, Vol. 2 of 3

Order Number: 330061-002US

385

The SoC has no Manageability Engine (ME). Unlike some Intel Peripheral Controller Hub 

(PCH) products, the SoC PECI-over-SMBus controller only operates in PECI mode. The 

SMBus Interface PECI Proxy Command Protocol is an encapsulation of PECI 

specification commands onto the SMBus by the SMBus master. Two new SoC-specific 

PECI commands are also supported.

The PECI proxy command bytes, encapsulated in bytes [N:2] of the protocol, conform 

to 

Environment Control Interface (PECI) Specification, Revision 3.0. The SoC PECI-over-

SMBus controller provides a transparent pass-through of the PECI command to the 

integrated PECI client and does not verify the validity of the command. It is the burden 

of the BMC or platform board External Circuitry (EC) to provide valid data in the PECI 

Proxy Command fields of the incoming packet.

Because the SMBus is used and not the serial PECI electrical interface, it is unnecessary 

to calculate the Frame Check Sequence (FCS). The SoC design does keep the PECI 

commands consist with non-SoC Intel products and carry additional bytes that are set 

to 0x0. These are called out where appropriate. The PECI Proxy Command Format is 

shown in 

0x4C 

(default)

0x62

0x04...N

Control Byte

(Reserved)

PECI Target 

Address

1

0x30 = 

CPU

1. Required PECI Header byte.

PECI Write 

Length

2

2. Required PECI Header byte. Must be set to the proper value as defined by the particular PECI Command. If an

Assured Write FCS (AW FCS) is needed, the PECI Write Length value must also include the AW FCS byte.

PECI Read 

Length

3

3. Required PECI Header byte. Must be set to the proper value as defined by the particular PECI Command.

Remaining 

Part of 

PECI 

Command

4

4. This field does not exist for the PECI Ping() command. This field is used for write data bytes including a

placeholder for an AW FCS byte. Note that the Retry bit shall be set to zero and the command code byte must

be one of the codes supported by the SoC.