Kenneth Ostby wrote: > Just my $.02 > > Timothy Normand Miller: > >> Yeah, those are hard to see. I'm guessing that the major impact is >> coordinates. I suggest that we have two multipliers. One with >> rounding for those cases where we need it for coordinates. And one >> without rounding, mostly for colors. >> > > Having two different multipliers for colors and coordinates seems like a > solution that could bite us in the behind if we have to update them > later. > > An interesting point would be how much we're actually gaining/loosing > from adding a 4th step to the multiplyer? Seing how it should be > possible to pipeline it, we shouldn't have to sacrifice a lot of > performance to gain accuracy? > > > Well it would add a fifth stage to the multiplier. That added stage would take something like 10 more slice in the design. Not that much but we are already taking 35 slice and 1 multiplier. It's rather small if you consider that we are having like 28K slice and 96 multiplier in the spartan3-4000.
The question is still how much space do we need for the full design? If we have the space it's not that long to add that stage later in the design, it would take something like 2 hour with basic simulation of the multiplier for design correctness. _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
