//===========================================================
// Discription: Display bin on segment
//              Segment encoding
//                  a
//                +---+
//              f |   | b
//                +---+  <- g
//              e |   | c
//                +---+
//                  d
//===========================================================
module DISPLAY ( // input
                 clk,
                 rst,
                 data_in,
                 data_ok,
                 // output
                 data_out
                 );

//----------------------------
// input
//----------------------------
input  [3:0]  data_in;
input         data_ok;

//----------------------------
// output
//----------------------------
output [7:0]  data_out;

//----------------------------
// reg
//----------------------------
reg    [7:0]  data_out;

//----------------------------
// main
//----------------------------
always @( data_in or data_ok )
begin
  data_out = 8'hFF;
  if ( data_ok )
    case ( data_in )
      4'b0000: data_out <= 8'hC0; // 0
      4'b0001: data_out <= 8'hF9; // 1
      4'b0010: data_out <= 8'hA4; // 2
      4'b0011: data_out <= 8'hB0; // 3
      4'b0100: data_out <= 8'h99; // 4
      4'b0101: data_out <= 8'h92; // 5
      4'b0110: data_out <= 8'h82; // 6
      4'b0111: data_out <= 8'hF8; // 7
      4'b1000: data_out <= 8'h80; // 8
      4'b1001: data_out <= 8'h90; // 9
      4'b1010: data_out <= 8'h88; // A
      4'b1011: data_out <= 8'h83; // b
      4'b1100: data_out <= 8'hC6; // c
      4'b1101: data_out <= 8'hA1; // d
      4'b1110: data_out <= 8'h86; // E
      4'b1111: data_out <= 8'h8e; // F
      default: data_out <= 8'hFF;
    endcase
  else
    ;
end