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

Inputs Outputs
$D_0$ $D_1$ $D_2$ $D_3$ $X_0$ $X_1$ $V$
$0$ $0$ $0$ $0$ $x$ $x$ $0$
$1$ $0$ $0$ $0$ $0$ $0$ $1$
$x$ $1$ $0$ $0$ $0$ $1$ $1$
$x$ $x$ $1$ $0$ $1$ $0$ $1$
$x$ $x$ $x$ $1$ $1$ $1$ $1$

What function does the truth table represent?

1. Priority encoder
2. Decoder
3. Multiplexer
4. Demultiplexer
retagged | 1.5k views

For $2^n \text{ inputs we are having } n \text{ outputs. Here n=2. }$

http://en.wikipedia.org/wiki/Priority_encoder

selected by
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what is significance of don't care here in priority encoder.
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To Give priority to Di+1 over Di

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A multiplexer or MUX is a combination circuit that contains more than one input line, one output line and more than one selection line. Whereas, an encoder is also considered a type of  multiplexer but without a single output line. It is a combinational logic function that has $2^{n}$ (or fewer) input lines and $n$ output lines.

http://www.differencebetween.info/difference-between-multiplexer-and-encoder

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ans b)
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Ans should b A

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