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Multiplexer⚓

Multiplexer

Described with a case structure:

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process(E1,E2,...,En,Sel)
begin
    case Sel is
        when "0...00" =>
            S <= E1;
        when "0...01" =>
            S <= E2;
        .
        .
        .
        when others =>
            S <= En;
    end case;
end process;

Described with a when else structure:

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S <= E1 when(Sel = "0...00")else
     E2 when(Sel = "0...01")else
     .
     .
     En-1 when (Sel = "......") else
     En;