1 votes 1 votes consider a synchronous DRAM unit in which each refresh will take 1ns. What is the total time required for a memory unit of 512MB with a word size of 32bits refreshed for two times? Siddharth Bhardawaj asked Oct 8, 2017 Siddharth Bhardawaj 384 views answer comment Share Follow See all 3 Comments See all 3 3 Comments reply srestha commented Oct 8, 2017 reply Follow Share 64 ms?? 0 votes 0 votes Siddharth Bhardawaj commented Oct 9, 2017 reply Follow Share no wrong...as i am little bit confused in answer either it is 54ns or 2^27*2ns. As 27 bits are required to address this memory. And i dont know about how refreshing is done in Memory.So please answer 0 votes 0 votes sachin! commented Oct 9, 2017 reply Follow Share no of row to refresh =512*1024*1024*8/32 =2^(27) row 1 ns to refresh 1 row 2^27 ns to refresh one time 2^28 ns for refresh 2 time 0 votes 0 votes Please log in or register to add a comment.