SPRUIU1C July 2020 – February 2024 DRA821U , DRA821U-Q1
Each MCSPI channel, if enabled, can issue DMA requests. There are two DMA request lines per MCSPI channel (one for read and one for write).
The DMA read request line is asserted when the MCSPI channel is enabled and new data is available in the receive register of the MCSPI channel. A DMA read request can be individually masked with the MCSPI_CHCONF_0/1/2/3[15] DMAR bit. The DMA read request line is de-asserted when reading of the MCSPI_RX_0/1/2/3 register of the MCSPI channel completes.
The DMA write request line is asserted when the MCSPI channel is enabled and the MCSPI_TX_0/1/2/3 register of the MCSPI channel is empty. A DMA write request can be individually masked with the MCSPI_CHCONF_0/1/2/3[14] DMAW bit. The DMA write request line is de-asserted when loading of the MCSPI_TX_0/1/2/3 register of the channel completes.