Timothy Normand Miller wrote:
instructions. Also, in response to his question, I'm targetting the
3S4000 because it's convenient. In the real design, we'll target the
XP10, which is a little slower. Either way, this tells us basically
what we need to know.
Doesn't that make this whole discussion moot? The XP10 doesn't have
hard multipliers, as near as I can tell. Regardless, the architecture
and timing aren't necessarily even remotely similar (well, sure, they're
both island-style FPGAs using 4-LUTs... but that's still a big design
space).
I'd be wary of putting to much stock in XST's timing estimates, anyhow.
Until you've got post-PAR timing, don't bank on it.
Finally, I don't think you mentioned the speed grade and package you're
using for the Spartan or the Lattice part. (Both are on the board,
right? I'm going off
http://wiki.duskglow.com/tiki-index.php?page=OGD1+components+guide.)
Your timing numbers will depend on that, too (even in XST's output, I
believe). Have those aspects been specified yet? I mean, at least the
package is presumably known.
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