// Testbench for 8:1 MUX
module testmux;
  reg [7:0] dat;
  reg [2:0] ctrl;
  wire muxout;
  mux81 u1 (muxout, dat, ctrl);
  initial
     begin
       $stop;
       #10;
       dat = 8'h55;
       #10;
       ctrl = 3'o0;
       #10;
       ctrl = 3'o1;
       #10;
       ctrl = 3'o2;
       #10;
       ctrl = 3'o3;
       #10;
       ctrl = 3'o4;
       #10;
       ctrl = 3'o5;
       #10;
       ctrl = 3'o6;
       #10;
       ctrl = 3'o7;
       #10
       dat = 8'hff;
       #10;
       ctrl = 3'o0;
       #10;
       ctrl = 3'o1;
       #10;
       ctrl = 3'o2;
       #10;
       ctrl = 3'o3;
       #10;
       ctrl = 3'o4;
       #10;
       ctrl = 3'o5;
       #10;
       ctrl = 3'o6;
       #10;
       ctrl = 3'o7;
       #10
       dat = 8'haa;
       #10;
       ctrl = 3'o0;
       #10;
       ctrl = 3'o1;
       #10;
       ctrl = 3'o2;
       #10;
       ctrl = 3'o3;
       #10;
       ctrl = 3'o4;
       #10;
       ctrl = 3'o5;
       #10;
       ctrl = 3'o6;
       #10;
       ctrl = 3'o7;
       #10
       dat = 8'h00;
       #10;
       ctrl = 3'o0;
       #10;
       ctrl = 3'o1;
       #10;
       ctrl = 3'o2;
       #10;
       ctrl = 3'o3;
       #10;
       ctrl = 3'o4;
       #10;
       ctrl = 3'o5;
       #10;
       ctrl = 3'o6;
       #10;
       ctrl = 3'o7;
       #10
       $stop;
   end
endmodule