Intel C2550 FH8065401488912 Data Sheet

Intel

®

 Atom™ Processor C2000 Product Family for Microserver

September 2014

Datasheet, Vol. 2 of 3

Order Number: 330061-002US

383

The PECI Device Address is defined as 0x30 + a socket identifier of 0…7. In the SoC, 

only a single socket model is supported, thus the PECI target address is always 0x30. 

Other PECI Device Addresses are rejected as an errors.

The Write Length byte conveys the number of bytes the originator sends the target 

device. Since all PECI message headers are identical in size, with the exception of 

Ping(), the Write Length byte only describes the number of command bytes sent. The 

Target Address, Write Length and Read Length fields are not included in the Write 

Length count. The following rules apply for the Write Length field:

• The maximum value is 0xFF.
• The command byte is included in the length.
• A Write Length of 0x0 is only for the Ping() command.

The Read Length byte conveys the number of bytes the target device must supply the 

originator before returning the Frame Check Sequence (FCS) byte calculated over that 

data. The Read Length is in the range of 0x00 and 0xFF.

All SoC PECI commands except Ping() require a Command byte. The command code is 

positioned as the first data byte, that is, data_byte[0].