Intel CONTROLLERS 413808 - Manual (Page 653)

Intel ® 413808 and 413812 I/O Controllers in TPER Mode
October 2007 Developer’s Manual
Order Number: 317805-001US 653
SMBus Interface Unit—Intel ® 413808 and 413812
Figure 88. DWORD Configuration Write Protocol (SMBus Byte Write, PEC Enabled)