I3C has two mandatory signal lines: Data (SDA) and Clock (SCL).

I3C v1.1+ and I3C Basic v1.1.1 also support optional Multi-Lane transfers, which use additional Data lines for supported I3C Modes. In Multi-Lane, the SDA line is called SDA[0] and the additional data lines are called SDA[1], SDA[2], etc.

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