Serial Peripheral Interface (SPI) Data Line

The Serial Peripheral Interface (SPI) is a three wire interface connecting the Body Function Controller (BFC) to the Instrument Cluster, which allows for them to exchange information. This interface is a synchronous serial data link where the BFC is the master and the Instrument Cluster is the slave. Because of the need for modules on the different serial data links to communicate with each other, the BFC acts as an interpreter, or master, for data communication between the Class 2 and SPI data lines.