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Fixed rolling OSD in 15 kHz mode, proper separation of vsync and hsync

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This commit is contained in:
phoboz
2016-12-28 21:14:32 +01:00
parent 99fd0adc40
commit bd43e36e8e
2 changed files with 29 additions and 17 deletions
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21
cores/sms/src/ntsc_video.vhd
View File

@@ -23,7 +23,8 @@ architecture Behavioral of ntsc_video is
signal in_vbl: std_logic;
signal screen_sync: std_logic;
signal vbl_sync: std_logic;
signal vbl_vsync: std_logic;
signal vbl_hsync: std_logic;
signal visible: boolean;
@@ -67,22 +68,26 @@ begin
if vcount<3 or (vcount>=6 and vcount<9) then
-- _^^^^^_^^^^^ : low pulse = 2.35us
if hcount<19 or (hcount>=254 and hcount<254+19) then
vbl_sync <= '0';
vbl_hsync <= '0';
vbl_vsync <= '0';
else
vbl_sync <= '1';
vbl_hsync <= '1';
vbl_vsync <= '0';
end if;
else
-- ____^^ : high pulse = 4.7us
if hcount<(254-38) or (hcount>=254 and hcount<508-38) then
vbl_sync <= '0';
vbl_vsync <= '0';
vbl_hsync <= '0';
else
vbl_sync <= '1';
vbl_vsync <= '1';
vbl_hsync <= '0';
end if;
end if;
end process;
hsync <= not screen_sync when in_vbl='0' else '0';
vsync <= not vbl_sync when in_vbl='1' else '0';
hsync <= not screen_sync when in_vbl='0' else vbl_hsync;
vsync <= not vbl_vsync when in_vbl='1' else '0';
visible <= (hcount>=164 and hcount<420 and vcount>=40 and vcount<232);

25
cores/sms/src/pal_video.vhd
View File

@@ -23,7 +23,8 @@ architecture Behavioral of pal_video is
signal in_vbl: std_logic;
signal screen_sync: std_logic;
signal vbl_sync: std_logic;
signal vbl_hsync: std_logic;
signal vbl_vsync: std_logic;
signal visible: boolean;
@@ -66,27 +67,33 @@ begin
begin
if vcount<2 then
if hcount<240 or (hcount>=256 and hcount<496) then
vbl_sync <= '0';
vbl_vsync <= '0';
vbl_hsync <= '0';
else
vbl_sync <= '1';
vbl_vsync <= '1';
vbl_hsync <= '0';
end if;
elsif vcount=2 then
if hcount<240 or (hcount>=256 and hcount<272) then
vbl_sync <= '0';
vbl_hsync <= '0';
vbl_vsync <= '0';
else
vbl_sync <= '1';
vbl_hsync <= '1';
vbl_vsync <= '0';
end if;
else
if hcount<16 or (hcount>=256 and hcount<272) then
vbl_sync <= '0';
vbl_hsync <= '0';
vbl_vsync <= '0';
else
vbl_sync <= '1';
vbl_hsync <= '1';
vbl_vsync <= '0';
end if;
end if;
end process;
hsync <= not screen_sync when in_vbl='0' else '0';
vsync <= not vbl_sync when in_vbl='1' else '0';
hsync <= not screen_sync when in_vbl='0' else vbl_hsync;
vsync <= not vbl_vsync when in_vbl='1' else '0';
visible <= (hcount>=166 and hcount<422 and vcount>=64 and vcount<256);