On Mon, 2005-11-28 at 08:47 -0500, Timothy Miller wrote: > On 11/28/05, Hans Kristian Rosbach <[EMAIL PROTECTED]> wrote: > > > > > Just a thought here.. > > > > What about making the card a hybrid? > > > > IE: one side has PCI, the other has AGP. > > IF nothing else, the AGP can just be plain PCI using AGP slot. > > > > If there is a possibility after release for the AGP speed to be > > increased to AGP-1x or something that would of course be a plus. > > > > Detecting whether AGP or PCI is the one being used should be > > no problem. Trace length? Maybe a problem, but I guess only for > > the higher-speed grades of AGP? > > > > Benefits: > > -One more slot to stuff the card in > > -Enthusiasts can now have a FPGA card in an AGP slot > > (I guess this could be used to something fun..) =) > > -Extra "Wooo.....oow" value. > > I don't mean to be a drag, but this has been thought of before, and > it's a routing nightmare. We're already tight on pins, and the > routing is already very complicated. In order to route this, we'd > need more layers (more expensive PCB) and more pins (more expensive > chip). > > Actually, we're pin-limited for OGD. For OGC, I don't know because we > haven't started working on the ASIC yet. Either way, the routing is > killer. Also, we haven't developed an AGP interface yet. All I've > done so far is PCI, and it's not even complete. > > Still, I'll discuss it with Andy at the appropriate time.
I fully agree on the routing nightmare. The pins needed however I'm not so sure.. Since AGP is backwards compatible with PCI, you should be able to reuse the same pins? I might be wrong, but I have understood AGP to be PCI+extras, so we need not use the extras. If for nothing else, since the AGP bus is separate from the PCI bus you'd get a small performance boost from having it all to yourself in the first place. In a regular PCI bus you have to fight for time alongside nics, usb, sound and hdd. ++ Unfortunately i can't find any links on google that agree with me. So, you specs experts: Can a PCI card work in an APG slot with a little rerouting magic? -HK _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
