Embedded Software Engineer Interview Question:

Tell me what is the need for DMAC in ES?

Submitted by: Muhammad

Direct memory access is mainly used to overcome the disadvantages of interrupt and program controlled I/O.
DMA modules usually take the control over from the processor and perform the memory operations and this is mainly because to counteract the mismatch in the processing speeds of I/O units and the processor. This is comparatively faster.
It is an important part of any embedded systems,and the reason for their use is that they can be used for bursty data transfers instead of single byte approaches.
It has to wait for the systems resources such as the system bus in case it is already in control of it.
Submitted by: Muhammad