Question: The memory of a particular microcomputer is built from 64K 1 DRAMs. According to the data sheet, the cell array of the DRAM is

The memory of a particular microcomputer is built from 64K × 1 DRAMs. According to the data sheet, the cell array of the DRAM is organized into 256 rows. Each row must be refreshed at least once every 4 ms. Suppose we refresh the memory on a strictly periodic basis.
a. What is the time period between successive refresh requests?
b. How long a refresh address counter do we need?

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