I3C has several Modes, each with one or more associated bit rates.

The base raw bitrate for SDR Mode is 12.5 Mbps, with 11 Mbps real data rate at 12.5 MHz clock frequency. This is the only Mode supported in both I3C v1.0 and I3C Basic v1.0.

The maximum raw bitrate is 33.3 Mbps at 12.5 Mhz, with real data rate of 30 Mbps. This is achieved vi HDR Modes that are currently only available in I3C v1.x (i.e., not available in I3C Basic v1.0).

Most traffic will use the 10–11 Mbps rate, while large messages can use one of the optional higher data rate (HDR) Modes or optional Multi-Lane transfers, which are available in I3C v1.1+ or I3C Basic v1.1.1.

Note: This question was updated for I3C v1.1.1. The I3C Controller should use the GETCAPS CCC (formerly named GETHDRCAPS) to determine which optional HDR Modes are supported for a given I3C Target. For details, see the specification at Section

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