Please explain your answer A particular 64 Mbit square memor

Please explain your answer

A particular 64 M-bit square memory array has its peripheral circuits reorganized to allow for the readout of a 64-bit double double word. How many address bits will the new design need?

Solution

Number of possible words=(64*10^6)/64=10^6

To address 10^6 words, minimum 10 address bits are required.