41.6.4.2 Packet Transmission Using the Generic Interface
While writing the packet information, first write the payload of a given packet into the payload FIFO using DSI_GEN_PLD_DATA. When the payload data is for the command parameters, place the first byte to be transmitted in the least significant byte position of the user interface data bus. For more information, see Generic Interface Payload Register.
After writing the payload, write the packet header into the command FIFO. For more information about the packet header organization on the user interface, see Generic Interface Header Register.