Question

A processor can support a maximum memory of 4 GB, where the memory is word addressable (a word consists of two bytes). The size of the address bus of the processor is at least _____ bits.

Answer 1

Correct answer is 31

Memory size = 4GB = 2³²bytes

Word size = 2 bytes

∴No. of Address bits = Memory size / word size = 2³² bytes / 2 bytes = 2³¹ ⇒ 31 bits