LEDBlinker.v

LEDBlinker.v

`default_nettype none
module top(
    input      clk, //clock input
    output reg LED1, //LED outputs
    output reg LED2,
    output reg LED3,
    output reg LED4,
    output reg LED5
    );

	localparam BITS = 5; //a bit for each LED
	localparam LOG2DELAY = 21; //size of the clock, divide it by 2**21 => 21 MHZ / 21 MHZ => 1HZ clock

	reg [BITS+LOG2DELAY-1:0] cntr = 0; //set up an array of flip flops as a clock scaler
	reg [BITS-1:0] outcnt; //output reg's we will map to the LEDs

	assign {LED1, LED2, LED3, LED4, LED5} = outcnt; //map the LED outputs to the outcnt reg's
	//this means everytime the LED* changes it will be according to the bit array in outcnt
	always @ (posedge clk) begin
		cntr <= cntr + 1; //update clock counter
		outcnt <= cntr >> LOG2DELAY; //assign value to outcnt
	end
	
endmodule