module SevenSegmentDisplayDecoder(ssOut, nIn);
  output [6:0] ssOut;
  input [3:0] nIn;

  reg [6:0] ssTmp;

  // ssOut format {g, f, e, d, c, b, a}

  always @(nIn)
    case (nIn)
      4'h0: ssTmp <= 7'b0111111;
      4'h1: ssTmp <= 7'b0000110;
      4'h2: ssTmp <= 7'b1011011;
      4'h3: ssTmp <= 7'b1001111;
      4'h4: ssTmp <= 7'b1100110;
      4'h5: ssTmp <= 7'b1101101;
      4'h6: ssTmp <= 7'b1111101;
      4'h7: ssTmp <= 7'b0000111;
      4'h8: ssTmp <= 7'b1111111;
      4'h9: ssTmp <= 7'b1100111;
      4'hA: ssTmp <= 7'b1110111;
      4'hB: ssTmp <= 7'b1111100;
      4'hC: ssTmp <= 7'b0111001;
      4'hD: ssTmp <= 7'b1011110;
      4'hE: ssTmp <= 7'b1111001;
      4'hF: ssTmp <= 7'b1110001;
      default: ssTmp <= 7'b1001001;
    endcase

    assign ssOut = ssTmp;
endmodule