Note: This question does not apply to I3C Basic v1.0.

No. The tSCO (Clock-to-Data Turnaround delay time) parameter is information provided by Target Devices so that system designers can properly compute the maximum effective frequency for reads on the Bus. The tSCO number is meant to be used together with the line capacitance (trace length) and number of Targets and stubs (if present).

However, I3C Targets with tSCO delay greater than 12 ns must do all of the following:

  • Set the Limitation bit in the Bus Characteristics Register (BCR) to 1’b1
  • Set the Clock-to-Data Turnaround field of the maxRD Byte to 3’b111
  • Communicate the tSCO value to the Controller by private agreement (i.e., product datasheet)

Note: I3C Basic v1.0 and I3C v1.1+ already clarify these aspects of communications in I3C.

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