The DMA channel control and status registers provide individual channel controllers. In simple DMA mode, these registers are used to move data. In link-list mode, these channels process descriptor tables to move data in memory.
Performance Considerations
The DMA provides more optimal performance when the controller is programmed with the following considerations:
- Read and write descriptor payloads are 128-bit aligned (in scatter-gather mode)
- SRC and DST descriptors are 256-bit aligned
- SRC and DST payload is >4 KB
The guideline is to match the capabilities of the read and write AXI channels and the DMA for the AXI read and write channels.