What is Direct Memory Access (DMA) and why is it important in a modern computer system? Explain.
What is Direct Memory Access (DMA) and why is it important in a modern computer system? Explain.
Solution::-
DMA ::- Few Points about DMA are following.
(1)DMA stands for Direct Memory Access.
(2)It is designed to transfer data at fastest rate.
(3)DMA allows the device to transfer the data directly to from memory without any interference of the Central Processing Unit.
(4)DMA Controller responsible for access memory directly without any interference of the Central Processing Unit.
How DMA is working::-
::- When any device want to send data to other device,It will send DMA request to DMA Controller.
::-DMA Controller sends hold request to the cpu .
::-The CPU leaves the control over bus and acknowledges the HOLD request through HLDA signal.
::-Now DMA controller has to manage operation over buses and cpu,I/O device.
::-This Controller takes over these small operations to save precious cycles of the Processor and thereby making things efficient.
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