In the following truth table, V = 1 if and only if the input is valid.

What function does the truth table represent?
(A) Priority encoder
(B) Decoder
(C) Multiplexer
(D) Demultiplexer


Answer: (A)

Explanation: Since there are more than one outputs and number of outputs is less than inputs, it is a Priority encoder

V=1 when input is valid and for priority encoder it checks first high bit encountered. Except all are having at least one bit high and ‘x’ represents the “don’t care” as we have found a high bit already. So answer is (A).

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