icestorm/examples/hx8kboard/example.v

module top (
	input  clk,
	output LED0,
	output LED1,
	output LED2,
	output LED3,
	output LED4,
	output LED5,
	output LED6,
	output LED7
);

	localparam BITS = 8;
	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 {LED0, LED1, LED2, LED3, LED4, LED5, LED6, LED7} = outcnt ^ (outcnt >> 1);
endmodule