Intel Microprocessor Interview Question:

Briefly explain DMA and its various addressing modes?

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- The DMA or the direct memory access is a type of process in which the System bus control is accessed and controlled by an external device in place of the CPU.

- It is primarily used for the high speed transfer of data from mass storage devices.

- The DMA functions by directly transferring data to and from from the memory to the devices.

- The various modes of operation of the DMA are as follows: Demand mode, Single mode, Block mode and Cascade mode.

- The characteristic of the demand mode is that it can transfer data until the Dreq input becomes inactive.
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