spartan-3an-blinking-led

program.ucf

NET "CLOCK_50M" LOC = "E12"  | IOSTANDARD = LVCMOS33 | PERIOD = 20.000;
NET "LED" LOC = "R20" | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = SLOW;

program.v

module program(
	input CLOCK_50M,
	output LED
);

reg [25:0] count = 26'b0;
reg led_state = 1'b1;
assign LED = led_state;

always @(posedge CLOCK_50M) begin
	count = count + 1;
	if (count == 50000000) begin
		led_state <= !led_state;
		count = 0;
	end
end


endmodule