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What is the duration for memory refresh to remain compatible?

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What is the duration for memory refresh to remain compatible?

(a) 20 microseconds

(b) 12 microseconds

(c) 15 microseconds

(d) 10 microseconds

I had been asked this question in an online quiz.

This interesting question is from DRAM Interfaces in chapter Memory Systems of Embedded Systems

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Right answer is (c) 15 microseconds

To explain I would say: The memory refresh is performed every 15 microseconds in order to remain compatible.

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