Question

A digital computer has a common bus system for 16 registers of 32 bits each. The bus is
constructed with multiplexers.
a. How many selection inputs are there in each multiplexer?
b. What size of multiplexers is needed?
c. How many multiplexers are the in the bus?

Answer 1

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(a) :- It is provided that the common bus system in a digital computer exists for registers, with each register having bits. Therefore we can have a -line common bus system. The common bus system comprises 16 registers, which is equivalent to registers. Therefore, 4 selection lines are required for each multiplexer.

(b) :- The bus is constructed with multiplexers. Therefore we have a universal bus system of 32 line. 16 registers are equal to 2*4 registers therefore 4 selection inputs are there in each multiplier.

(c) :- No. of multiplexers = bits of register = 32 32 multiplexers are needed in a bus.