# how does cpu read 32 bit word from memory

I'm interested in how does cpu read 32 bit word from memory .If the processor has 32 bits of address space then it can address 4,294,967,295 locations (or 4 gb) Does this mean that each location has 32 bits.?

• What do you mean by "how"?
– Raphael
Feb 16 '18 at 11:16
• Modern computers are byte addressable. Each address refers to one 8-bit byte. When the processor wants to load/store a larger size, consecutive addresses are accessed. The memory understands these larger requests: several different transfer sizes can be requested as part of the cpu-memory bus protocol. Feb 18 '18 at 1:04

Address Space and Word Size are indeed two different things. If my processor has an $n$ bit address space, then it can address $2^n$ addresses. Note that this is merely the number of addresses and is not $2^n$ GB.
The word size of a memory refers to the size of the smallest addressable unit of the memory. In other words if my processor has an $n$ bit address space and a word-size of $b$ bytes, then my processor can address $2^n$ locations each of which are $b$ bytes long.