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I've been scratching my head here for a while, and I'm still not
certain I've got this right. Can someone give me a yea or nay on this?
- -- posNOW is a 8 bit counter, that goes up from 0 to 227
- -- regVSYNC is bit 1 of TIA register address VSYNC
- -- regVBLANK(0) is bit 1 of TIA register address VBLANK
- -- sync is the sync output pin of the TIA (pin 2)
- -- nblk is the bl output pin of the TIA (pin 6)
- -- video sync output
process (posNOW)
begin
if posNOW = "11100000" then -- 11100000 == 224
sync <= not ('1' xor regVSYNC);
elsif posNOW = "01000000" then -- 01000000 == 64
sync <= not ('0' xor regVSYNC);
end if;
end process;
- -- video blank output
process (regVBLANK)
begin
nblk <= not regVBLANK(0);
end process;
Once I'm sure I've got this right, I can move into testing.
- --
adam@xxxxxxxxxxxxxxxx http://cuddlepuddle.org/~adam
KG6GZR http://cuddlepuddle.org/~adam/resume.html
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