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	always @(posedge clk) begin
		if (candraw) begin
		    n_vga_blank <= 1'b0;
			
			// output a red rectangle in the middle of the screen
			for (i = 0; i < 16; i = i + 2) begin
				if (x > (i * 80) && x < ((i + 1) * 80)) begin
					red 	<= 10'b11_1111_1111;
					green 	<= 10'd0;
					blue	<= 10'd0;
					// with a blue background
				end else begin
					red		<= 10'd0;
					green	<= 10'd0;
					blue	<= 10'b11_1111_1111;
				end
			end
		end else begin
			// if we are not in the visible area, we must set the screen blank
			n_vga_blank <= 1'b1;
		end