Why we use it ?
In normal scenario whenever data transfer is done, processor should be informed. If there is more data, it could lead a lot of time of CPU. To overcome this issue, DMA concept came in picture, using DMA, computer can access system memory without telling Processor.
Earlier when DMA was not there, CPU will be busy when transfer is happening, but now with DMA, CPU can do other operations while transfer is happening.
Misc:
DMA has its configuration, which describe what it will be transfering, from where it will be taking data. what is the size? There are many other settings too. There will be one internal buffer also, which will be taking data from source and then putting it at destination.
When we want to start the transfer, there will be one bit associated, when you write it, it will intiate the transfer.
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