In I3C v1.0 and I3C Basic v1.0, support for certain CCCs relating to Dynamic Address Assignment (DAA) was defined as always required. The SETDASA CCC was originally intended to be a quicker method of assigning the initial Dynamic Address (i.e., from a fixed Static Address). In I3C Basic v1.0, the SETAASA CCC was also added in response to a request to more quickly assign all Dynamic Addresses from such fixed Static Addresses for I3C Target Devices that support these CCCs and that also have fixed Static Addresses. In both cases, support for the ENTDAA and SETNEWDA CCCs was defined as always required, as the SETDASA CCC was intended as a time-saving alternative for I3C Target Devices that also supported the ENTDAA CCC.

In I3C v1.1, the normative text for Dynamic Address Assignment in specification Section 5.1.4.2 was revised to allow the Controller to end the assignment procedure early without using the ENTDAA CCC, when it knew that all such I3C Targets already had Dynamic Addresses assigned from Static Addresses (i.e., via the SETDASA and/or SETAASA CCCs). Additionally, the SETDASA and SETAASA CCCs were defined as fully-supported options, whereas the ENTDAA CCC was defined as required except under special conditions (i.e., if a fixed Static Address was used). The SETNEWDA CCC was changed to ‘conditionally required’ status. Unfortunately, the I3C v1.1 specification text incompletely defined when this CCC should be supported, and continued to rely on assumptions about the use of this CCC (in particular, assumptions aboutthe Controller’s ability to change a Target’s Dynamic Address) which conflicted with the CCC’s new definition as being conditionally required depending upon the use case.

The I3C v1.1.1 specification resolves these conflicts and inconsistencies. The definition of the SETNEWDA CCC has been revised to clarify how it affects an I3C Target Device’s assigned Dynamic Address, and when the CCC may be used.

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I3C