ADLINK CoreExpress-ECO2 - Manual (Page 10)

3 COMMANDS OF THE SMC
To start communication between the bus master (SMBus host controller of Chipset) and the slave
device (SMC), the host controller must initiate a Start condition followed by the address of the SMC.
The SMC recognizes his address and responds with ACK. Following this, the host controller sends the
Command Code (shown in Table 3.1).