tests/asicworld/code_hdl_models_decoder_using_case.v

   1 //-----------------------------------------------------
   2 // Design Name : decoder_using_case
   3 // File Name   : decoder_using_case.v
   4 // Function    : decoder using case
   5 // Coder       : Deepak Kumar Tala
   6 //-----------------------------------------------------
   7 module decoder_using_case (
   8 binary_in   , //  4 bit binary input
   9 decoder_out , //  16-bit  out
  10 enable        //  Enable for the decoder
  11 );
  12 input [3:0] binary_in  ;
  13 input  enable ;
  14 output [15:0] decoder_out ;
  15
  16 reg [15:0] decoder_out ;
  17
  18 always @ (enable or binary_in)
  19 begin
  20   decoder_out = 0;
  21   if (enable) begin
  22     case (binary_in)
  23       4'h0 : decoder_out = 16'h0001;
  24       4'h1 : decoder_out = 16'h0002;
  25       4'h2 : decoder_out = 16'h0004;
  26       4'h3 : decoder_out = 16'h0008;
  27       4'h4 : decoder_out = 16'h0010;
  28       4'h5 : decoder_out = 16'h0020;
  29       4'h6 : decoder_out = 16'h0040;
  30       4'h7 : decoder_out = 16'h0080;
  31       4'h8 : decoder_out = 16'h0100;
  32       4'h9 : decoder_out = 16'h0200;
  33       4'hA : decoder_out = 16'h0400;
  34       4'hB : decoder_out = 16'h0800;
  35       4'hC : decoder_out = 16'h1000;
  36       4'hD : decoder_out = 16'h2000;
  37       4'hE : decoder_out = 16'h4000;
  38       4'hF : decoder_out = 16'h8000;
  39     endcase
  40   end
  41 end
  42
  43 endmodule