Signal vergisst sofort seinen Wert

      if colcnt = 640 then -- blanking and stop image generation

        shblank <= '1';

        sfbufctrl_clken <= '1'; -- <=== ZEILE 61 ===

        colcnt <= colcnt + 1;

      elsif colcnt = (640 + 24) then -- hsync begin

        shsync <= '1';

        colcnt <= colcnt + 1;

      elsif colcnt = (640 + 120) then -- hsync end

         shsync <= '0';

        colcnt <= colcnt + 1;

      elsif colcnt <= (640 + 165) then -- start image generation

        sfbufctrl_clken <= '0'; -- <=== ZEILE 70 ===

        colcnt <= colcnt + 1;

      elsif colcnt = (640 + 168) then -- reset line

        shblank <= '0';

        colcnt <= (others => '0');

        if rowcnt = 480 then -- start vsync

          svblank <= '1';

          rowcnt <= rowcnt + 1;

        elsif rowcnt = (480 + 14) then

          svsync <= '1';

          rowcnt <= rowcnt + 1;

        elsif rowcnt = (480 + 16) then

          svsync <= '0';

          rowcnt <= rowcnt + 1;

        elsif rowcnt = (480 + 48) then

          svblank <= '0';

          rowcnt <= (others => '0');

        else -- image

          rowcnt <= rowcnt + 1;

        end if;

      else -- image, processed somewhere else

        colcnt <= colcnt + 1;          

      end if;

  hsync <= shsync;

  vsync <= svsync;

  blank <= (shblank or svblank);

  fbufctrl_clken <= sfbufctrl_clken;