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- removed (quick and dirty) copy of front-Pointer to back-Pointer on buffer change. back-Pointer keeps host written value.

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git-svn-id: http://moon:8086/svn/vhdl/trunk@663 cc03376c-175c-47c8-b038-4cd826a8556b
This commit is contained in:
jens
2009-11-15 22:19:36 +00:00
parent 76baac4f8c
commit 8982313c71
1 changed files with 2 additions and 7 deletions
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lib/VGA_ctrl/src/vga_frontend64.vhd
+2 -7
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@@ -357,20 +357,15 @@ pixel_counter:
if pixel_cnt_rst = '1' then
pixel_cnt := 0;
front := host_fb_front;
back := host_fb_back;
elsif request_cnt_en = '1' and SRDY_I = '1' then
if pixel_cnt /= MAX_REQUEST_CNT/2-1 then
pixel_cnt := pixel_cnt + 1;
else
pixel_cnt := 0;
front := vga_fb_back;
back := vga_fb_front;
front := host_fb_back;
bufchg <= '1';
end if;
end if;
if host_fb_back_we = '1' then
back := host_fb_back;
end if;
vga_fb_front <= front;
vga_fb_back <= back;
ADDR_O <= front + (to_unsigned(pixel_cnt, 29) & "000");
@@ -487,7 +482,7 @@ registers_write:
vga_master_en <= '0';
bufchg_irq_en <= '0';
host_fb_front <= X"40000000";
host_fb_back <= X"40004000";
host_fb_back <= X"40010000";
cg_color <= (X"FF", X"FF", X"FF", X"FF");
elsif (STB_I and CYC_I and WE_I) = '1' then
case ADDR_I(5 downto 2) is