How many address bits are needed to select all the memory wo

How many address bits are needed to select all the memory words in a 2G x 1 RAM ?

a. 15

b. 31

c. 33

d. None of the above

Solution

correct option is 31 bits

2^30 = 1073741824 = 1.07 GB

2^31 = 2147483648 = 2.14 GB

so, 31 address bits are needed