File: example.v

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/* Binary counter displayed on LEDs (the 4 green ones on the right).
 * Changes value about once a second.
 */
module top (
	input  clk,
	output LED2,
	output LED3,
	output LED4,
	output LED5
);

	localparam BITS = 4;
	localparam LOG2DELAY = 22;

	reg [BITS+LOG2DELAY-1:0] counter = 0;
	reg [BITS-1:0] outcnt;

	always @(posedge clk) begin
		counter <= counter + 1;
		outcnt <= counter >> LOG2DELAY;
	end

	assign {LED2, LED3, LED4, LED5} = outcnt;
endmodule