37.2.4.2.2 I3C Dynamic Address
0b01
) and will no longer respond to the
Static Address. The Controller communicates with the Target at I3C speeds once
it is assigned a Dynamic Address.While the Target is operating in I3C SDR mode, the Controller can engage with the Target in the following ways:
- Private Read/Write Transaction
- Broadcast Common Command Code (CCC) Write Transaction
- Direct CCC Read/Write Transaction
- In-Band Interrupt (IBI) Transaction
The Target’s Dynamic Address transmitted on the bus immediately following a Start (but not a Restart condition) is subject to arbitration, meaning both the Controller and the Target can drive the Target’s Dynamic Address after a Start condition.
- The Controller can transmit
the Target’s Dynamic Address following a Start condition to initiate a
Private Transaction. The Controller also transmits a
R/W bit along with the Dynamic Address. When
R/W=
1
(read), the Controller initiates a Private Read Transaction, whereas R/W =0
(write) signifies a Private Write Transaction. The Target responds to this request by acknowledging (or not acknowledging) through the ACK/NACK bit that follows the R/W bit. - The Target can transmit its own Dynamic Address following a Start condition to initiate an IBI request.(1) An IBI request is always made in Read mode (the Target releases SDA high for R/W bit). The Controller responds to this request by acknowledging (or not acknowledging) through the ACK/NACK bit that follows the R/W bit. Refer to the In-Band Interrupt (IBI) section for details on Controller actions during an IBI transaction.
Since the address header following a Start condition is arbitrable, both cases mentioned above can happen concurrently. Refer to I3C Address Arbitration for more information.
- When this Target device is operating in Static Address SDR Mode and does not have a Dynamic Address assigned, the module will transmit its Static Address to request for an In-Band Interrupt.