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Consider the following combinational function block involving four Boolean variables x, y, a, b where x, a, b are inputs and y is the output. f (x, y, a, b) { if (x is 1) y = a; else y = b; } Which one of the following digital logic blocks is the most suitable for implementing this function?

1. Full adder
2. Priority encoder
3. Multiplexor
4. Flip-flop

Correct answer: Multiplexor

Solution

The function described selects between two inputs, a and b, based on the value of x, which is characteristic of a multiplexor. A multiplexor routes one of its multiple inputs to the output depending on the control signal, making it the most suitable choice for this logic function.

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