Intel C2338 FH8065501516761 データシート
製品コード
FH8065501516761
Intel
®
Atom™ Processor C2000 Product Family for Microserver
September 2014
Datasheet, Vol. 2 of 3
Order Number: 330061-002US
383
Volume 2—SMBus 2.0 Unit 2 - PECI—C2000 Product Family
PECI Over SMBus
17.6.1.1
Target Address Field
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.
17.6.1.2
Write Length Field
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 command byte is included in the length.
• A Write Length of 0x0 is only for the Ping() command.
17.6.1.3
Read Length Field
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.
17.6.1.4
Command Byte
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].