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6. (5 pts) The memory of a particular microcomputer is built from 64K x 1 DRAMs. According to the data sheet, the cell array of the DRAM is organized into 512 rows. Each row must be refreshed at least once every 6 ms (the maximum refresh time) Suppose we refresh the memory on a strictly periodic basis, meaning you only have enough refresh circuitry to refresh one row at a time, so you step through row by row) What is the minimum acceptable time period between successive refresh requests, row to row? Hint: convert thesout maximum refresh time for a row into s. That's how long you have t make it through an entire loop of all the rows, refreshing them, until you must return to the same row where you began