User`s manual

56 end

57 else

58 count = count+1;

59 end

61 always @(posedge clock_27mhz)

62 if (reset)

63 reset_count <= 100;

64 else

65 reset_count <= (reset_count==0) ? 0 : reset_count-1;

67 assign dreset = (reset_count != 0);

69 assign disp_clock = ~clock;

71 ////////////////////////////////////////////////////////////////////////////

72 //

73 // Display State Machine

74 //

75 ////////////////////////////////////////////////////////////////////////////

77 reg [7:0] state; // FSM state

78 reg [9:0] dot_index; // index to current dot being clocked out

79 reg [31:0] control; // control register

80 reg [3:0] char_index; // index of current character

81 reg [39:0] dots; // dots for a single digit

82 reg [3:0] nibble; // hex nibble of current character

84 assign disp_blank = 1’b0; // low <= not blanked

86 always @(posedge clock)

87 if (dreset)

88 begin

89 state <= 0;

90 dot_index <= 0;

91 control <= 32’h7F7F7F7F;

92 end

93 else

94 casex (state)

95 8’h00:

96 begin

97 // Reset displays

98 disp_data_out <= 1’b0;

99 disp_rs <= 1’b0; // dot register

100 disp_ce_b <= 1’b1;

101 disp_reset_b <= 1’b0;