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Which of the following address mode uses a buffer to hold data temporarily?

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Which of the following address mode uses a buffer to hold data temporarily?

(a) 1D model

(b) 2D model

(c) dual address model

(d) 3D model

I had been asked this question in homework.

Question is from DMA-II in portion Basic Peripherals of Embedded Systems

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The correct choice is (c) dual address model

The explanation is: The dual address mode supports two addresses and two accesses for transferring data between a peripheral or memory and another memory location, which also consumes two bus cycles and a buffer within the DMA controller to hold data temporarily.

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