In addition to open drain, pull-up and high-keeper, the I3C Bus has three distinct conditions under which the Bus is considered inactive: Bus Free, Bus Available, and Bus Idle.

  • Bus Free condition is defined as a period occurring after a STOP and before a START and for a given duration (e.g., tCAS and tBUF timing).
  • Bus Available condition is defined as a Bus Free condition for at least tAVAL duration. A Slave may only issue a START request (e.g., for In-Band Interrupt or Master Handoff) after a Bus Available condition.
  • Bus Idle condition is defined to help ensure Bus stability during Hot-Join events. This condition is defined as a period during which the Bus Available condition is sustained continuously for a duration of at least tIDLE.
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