For DMA mode operation, follow these steps.
- Select the generic mode by writing a 1 to the QSPI.GEN_SEL register bit.
- Write the command, address, dummies in the generic FIFO using the read request.
- The generic quad SPI controller sends the command as programmed in the generic FIFO and reads the data into the RXFIFO.
- The DMA controller issues DMA requests using the AXI master interface and sends the RXFIFO data.