On Mon, Dec 05, 2005 at 08:27:31AM -0500, Timothy Miller wrote: > On 12/5/05, Hans Kristian Rosbach <[EMAIL PROTECTED]> wrote: > > > > Having the _potential_ for video-in increases the market for OGD. > > > > This could also be solved using an expansion card, so users can > > upgrade later without having to solder. I assume this would also > > free up some more pins for use with the expansion slot(s?). > > > > An expansion card could just be a simple addon like video-in or > > something like that, but using another fpga on the expansion > > card could make for a "switch/hub" for several expansions. > > I have made that suggestion to Andy. And that's what we'll do if we > run into a routing problem. But there are cost and manufacturing > tradeoffs that would make such an expansion card more challenging. > Why not go for a pair of DVO like interfaces next to a single SIL178 and a single ramdac. Add a VIP like connection next to one of the DVOs and you can have video in.
You can find this sort of setup on many GeForce2 boards: 1 dvo like interface with a VIP bit next to it. Elsa Gladiacs were able to use a BT869 or an SAA711x on seperate daughterboards. Geforce2s and the early MXen are quite interesting pieces of hardware output/input wise. (Too bad that the X driver is a mess modesetting wise). DVO is digital video output or something, and is used on most intel i8xxen. The i9xxen, with pci-express, have moved to SDVO. The ADD cards intel made for the i845 and i865 were possible because of 2 DVO busses being multiplexed with AGP. You can find more information about this in the intel northbridge datasheets, which are freely downloadable (in contrast with actual intel IGP programming information). DVO is basically a 12bit data bus, with H/VSync, enable and i2c. nVidia, SiS and VIA pretty much do/did the same, but the resulting ADD cards are of course not pin-compatible. The VIA EPIAs (with the so called LVDS option - (.tw idiots)) have pretty much the same thing going with special daughterboards. I even have a KM133 (ProSavage) based asus board which has a BT869 sitting on a tiny daughterboard. Luc Verhaegen. _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
