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A digital computer has a common bus system for 8 registers 16 bits each. How many multiplexers are required to implement common bus? What size of multiplexers is required?
Correct Answer: A — 16, 8 × 1
Explanation:
Key Points The number of multiplexers required to construct the bus is equal ton, where n is thenumber of bits in each register. The size of each multiplexer must bek: 1 since it multiplexes k data lines, where k is the number of registers. Therefore If there are 8 registers of 16 bits each, then we need 16 multiplexers, each of which is an 8: 1 multiplexer to create the 16-bit data bus.