[mythtv-users] Hardware for Best TV-Out?
Cory Papenfuss
papenfuss at juneau.me.vt.edu
Tue Oct 26 14:49:51 UTC 2004
> Now that you've successfully gotten me off on this tangent, I'm
> looking into the feasibility of using the 14.318Mhz clock that's on the VGA
> card. The AD724 datasheet mentions using this for a synchronous system, and
> I might be able to get ahold of it via the "VGA Feature Connector" That
> would greatly simplify the circuit construction/components/tuning since it
> wouldn't even need a crystal then (and would also be more accurate NTSC). If
> that doesn't work, a PLL programmed to reconstruct P/Q times the dotclock
> from the HSYNC signal might be a very viable alternative. Of course if you
> change the modeline, you'd have to reprogram your circuit (Let's see... 912
> in binary for the DIP switches is...)
>
Quick check on the "VGA Feature Connect." Doesn't seem to be
standard. Some cards output dotclocks, some don't, some divide by a
number, some only work in console (VGA) but not X. Bummer... I was hoping
to get ahold of an easy synchronous signal to build rev2 of the board.
-Cory
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