AXI DMA Overview

1. DMA mode

It works in two different modes, but only one at a time.

(1) Scatter/Gather mode

(2) Simple DMA mode

 

2. Block Diagram

 

3. data flow of simple DMA mode

MM2S: read data from a mater external memory -> DMA Data Mover(MM2S) -> output through AXI4-Stream(MM2S) to a slave peripheral 

SS2M: master peripheral send data to AXI Stream(S2MM) ->  DMA Data Mover(S2MM) -> write data to a slave external memory

 

4. MM2S/S2MM channel setup sequence