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Which of the following transfer mode can refresh the DRAM memory?

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Which of the following transfer mode can refresh the DRAM memory?

(a) verify transfer mode

(b) bloch transfer mode

(c) demand transfer mode

(d) cascade mode

I got this question during an online exam.

I'm obligated to ask this question of Implementation of DMA topic in section Basic Peripherals of Embedded Systems

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Correct choice is (a) verify transfer mode

For explanation: The verify address transfer mode can generate dummy addresses which are used for the DRAM refreshing.

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