The RC interface of the integrated block sends completion data received from the link to the user application as AXI4-Stream packets. Each packet starts with a descriptor and can have payload data following the descriptor. The descriptor is always 12 bytes long, and is sent in the first 12 bytes of the completion packet. The descriptor is transferred during the first two beats on a 64-bit interface, and in the first beat on a 128- or 256-bit interface. When the completion data is split into multiple Split Completions, the integrated block sends each Split Completion as a separate AXI4-Stream packet, with its own descriptor.
The format of the Requester Completion descriptor is illustrated in This Figure . The individual fields of the RC descriptor are described in Table: Requester Completion Descriptor Fields .