> We've discovered that the clock generators in the Xilinx FPGA part are > lousy for generating video clocks. We're seeing like 900ps of jitter, > which causes artifacts on DVI monitors at resolutions as low as > 1280x1024 when the cable gets beyond a certain length. (I don't > recall all the details.) > > One option is to use the clock generators in the Lattice part, but > even they have like 400ps of jitter, and they also severely limit the > range of frequencies we can generate. > > So the best solution we can come up with is to put on some external > clock generators. One for each video head. Problems: (1) more time > to mod the design, (2) up to $15 each for the generators, (3) we have > no idea what generators to use, how good they are, how to wire them.
What cable length are we talking about? Would a cable equalizer be useful? The NS part below (not a recommendation, just something google found) claims over 40 meters using 24 AWG DVI/HDMI cable at 1.65 Gbps, over 30 meters at 2.25 Gbps (1080p). $6.95 each in 100-unit quantities http://www.national.com/news/item/0,1735,1241,00.html _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
