[stella] no sync

[Adam Wozniak <adam@xxxxxxxxxxxxxxxx>]

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Alrighty, what am I doing wrong?

   -- values calculated fo 8 bit DAC from 3.3V source.

   type NTSCTYPE is array (0 to 7) of std_logic_vector(7 downto 0);

   constant ntsc_mid : NTSCTYPE :=
     ( X"17", X"1E", X"25", X"2C", X"32", X"39", X"40", X"47");
   constant ntsc_hi  : NTSCTYPE :=
     ( X"22", X"29", X"30", X"36", X"3D", X"44", X"4B", X"52");
   constant ntsc_lo  : NTSCTYPE :=
     ( X"0C", X"13", X"1A", X"21", X"28", X"2E", X"35", X"3C");
   constant ntsc_sync : std_logic_vector(7 downto 0) := X"00";
   constant ntsc_black : std_logic_vector(7 downto 0) := X"17";


   -- posNOW is an 8 bit counter which rolls over at 227
   -- active video is from 68 to 227

   -- color and lm are the color and luminance if the current pixel
   -- colors is an array of phase shifted color signals


   -- ntsc output values
   process (posNOW, color, lm, regVSYNC, colors, clk)
   begin
      if regVSYNC = '1' then
	    if posNOW = X"00" then
	       ntsc <= ntsc_black;
	    elsif posNOW = X"0E" then
	       ntsc <= ntsc_sync;
	    end if;
	 else
	    if posNOW = X"00" then
	       ntsc <= ntsc_sync;
	    elsif posNOW = X"0E" then
	       ntsc <= ntsc_black;
            elsif posNOW >= X"12" and posNOW <= X"1C" then
	       if clk = '1' then
		     ntsc <= ntsc_hi(0);
		  else
		     ntsc <= ntsc_lo(0);
		  end if;
            elsif posNOW >= X"1D" and posNOW <= X"44" then
	       ntsc <= ntsc_black;
	    elsif posNOW >= X"45" then
	       if color = "0000" then
	          ntsc <= ntsc_mid(CONV_INTEGER(lm));
		  else
		     if colors(CONV_INTEGER(color)) = '1' then
	             ntsc <= ntsc_hi(CONV_INTEGER(lm));
			else
	             ntsc <= ntsc_lo(CONV_INTEGER(lm));
			end if;
		  end if;
	    end if;
	 end if; 
   end process;



- -- 
adam@xxxxxxxxxxxxxxxx        http://cuddlepuddle.org/~adam
KG6GZR                       http://cuddlepuddle.org/~adam/resume.html


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