Sim/circuit5

This is a combinational circuit. Read the simulation waveforms to determine what the circuit does, then implement it.

module top_module (
    input [3:0] a,
    input [3:0] b,
    input [3:0] c,
    input [3:0] d,
    input [3:0] e,
    output [3:0] q );

    always @ (*)
        case (c)
            4'h0 : q = b;
            4'h1 : q = e;
            4'h2 : q = a;
            4'h3 : q = d;
            default q = 4'hf;
        endcase
endmodule