A digital computer has a common bus system for 16 registers of 32 bits each.…
2022
A digital computer has a common bus system for 16 registers of 32 bits each. Bus is constructed with multiplexers. The number of selection inputs in each multiplexer is ______.
- A.
8
- B.
5
- C.
4
- D.
None of the above
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Correct answer: C
A multiplexer with n selection inputs can select 2ⁿ inputs. We need to select one of 16 registers, so 2ⁿ = 16 → n = log₂16 = 4 . Hence, each multiplexer needs 4 selection inputs .