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Which is the very basic technique of refreshing DRAM?

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Which is the very basic technique of refreshing DRAM?

(a) refresh cycle

(b) burst refresh

(c) distributive refresh

(d) software refresh

This question was posed to me in my homework.

This question is from DRAM Refreshing Techniques topic in section Memory Systems of Embedded Systems

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The correct choice is (a) refresh cycle

Explanation: The DRAM needs to be periodically refreshed and the very basic technique is a special refresh cycle, during these cycles no other access is permitted. The whole chip is refreshed within a particular time period otherwise, the data will be lost.

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