9.7.5.15 Defining Byte Support

The Defining Byte Support feature is an extended feature to the existing CCC transfer model. The Defining Byte is included after the CCC and before the payload (Broadcast CCCs)/restart (Directed CCCs) to indicate an extended capability or an action associated with the CCC. The Defining Byte is supported for both Broadcast and Directed SDR CCC transfers. In both cases, the Defining Byte is included after CCC byte as a sub-command before the payload.

The following figures describe the placement of Defining Byte in Broadcast CCC and Directed CCC transfers, respectively.

Figure 9-226. Broadcast CCC with Defining Byte

Figure 9-227. Directed CCC with Defining Byte

The Defining Byte is enabled for Broadcast or Directed SDR CCC transfers by setting the ‘Defining Byte Present (DBP)’ bit in Transfer command and the Defining Byte value is captured from ‘Defining Byte (DB)’ field of Transfer argument or Short Data argument.