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digit_scroll.v
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digit_scroll.v
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`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company: None
// Engineer: N. Hutton
//
// Create Date: 13:21:29 01/14/2015
// Design Name:
// Module Name: digit_scroll
// Project Name: basys-2_7_segment
// Target Devices: basys2 Spartan-3E 100k
// Tool versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module digit_scroll(
input CLK,
input [31:0] cyclesPerStrobe,
input RESET,
output reg [7:0] asciiOne,
output reg [7:0] asciiTwo,
output reg [7:0] asciiThree,
output reg [7:0] asciiFour
);
localparam STRING_TO_DISPLAY = "0123456789ABCDEF ";
localparam STRING_LENGTH = 17;
reg [(8*STRING_LENGTH)-1:0] stringvar;
reg [31:0] ticker;
reg tickerClock;
always @ (posedge CLK)
begin
if(ticker >= cyclesPerStrobe) //reset after 1 second
begin
ticker <= 0;
tickerClock <= 1;
end
else
begin
ticker <= ticker + 1;
tickerClock <= 0;
end
end
always @ (posedge tickerClock or posedge RESET)
begin
if(RESET)
begin
stringvar <= STRING_TO_DISPLAY;
asciiOne <= 8'b11111111;
asciiTwo <= 8'b11111111;
asciiThree <= 8'b11111111;
asciiFour <= 8'b11111111;
end
else
begin
asciiOne <= asciiTwo;
asciiTwo <= asciiThree;
asciiThree <= asciiFour;
asciiFour <= stringvar[7:0];
stringvar <= stringvar << 8;
stringvar[7:0] <= stringvar[(8*STRING_LENGTH)-1:(8*STRING_LENGTH)-8];
end
end
endmodule