module Mux_4_32_if 
  (mux_out, data_3, data_2, data_1, data_0, select, enable);
	  output 	[31: 0] 	mux_out;
 	  input 	[31: 0] 	data_3, data_2, data_1, data_0;
	  input 	[1:0] 	select;
	  input 		enable;
	  reg 	[31:0]	mux_int;

	  assign mux_out = enable ? mux_int : 32'bz;

	  always @ ( data_3 or data_2 or data_1 or data_0 or select)
	    if (select == 0) mux_int = data_0; else
      if (select == 1) mux_int = data_1; else 
        if (select == 2) mux_int = data_2; else 
          if (select == 3) mux_int = data_3; else mux_int = 32'bx;
	endmodule