SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
After reset, initialization, and configuration the host may initiate transmit operations. Transmit operations are initiated by host writes to the appropriate transmit channel head descriptor pointer contained in the STATERAM block. The transmit DMA controller then fetches the first packet in the packet chain from memory in accordance with CPPI protocol. The DMA controller writes the packet into the external transmit FIFO in 64-byte bursts (maximum).
Receive operations are initiated by host writes to the appropriate receive channel head descriptor pointer after host initialization and configuration. The receive DMA controller writes the receive packet data to external memory in accordance with CPPI protocol. For a detailed description of buffer descriptors, see Section 24.11.4.11, CPPI Buffer Descriptors.