how to Calculate number of address bits needed for memory?

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Published on 2010-04-24T15:26:08Z Indexed on 2010/04/24 15:33 UTC
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Hi I am preparing my exam for computer system. I don't quite understand how to calculate the number of address bits needed for the memory.

For example,
Suppose that a 1G x 32-bit main memory is built using 256M x 4-bit RAM chips and this memory is word-addressable.

What is the number of address bits needed for a memory module?

What is the number of address bits needed for the full memory?

And what about If the memory is byte addressable, what would be the solutions?

Many thanks

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