Why must drams be refreshed and how may a refresh operation, Computer Engineering

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Why must drams be refreshed and how may a refresh operation

Question: 1. Why must DRAMs be refreshed, and how may a refresh operation be carried out?

2. What is the maximum refresh period for typical 64-K-, 256-K-, and 4-Mbit DRAMs, respectively?

3. Why is there a limit of 10,000 ns on the time for which RAS* or CAS* can be active-low? What is the meaning of precharge time and what effect does it have on the design of DRAM systems?

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