Quartus II 10.0 SP1 to 10.1 - Timing Worse?

Thanks, kpad.

I'm now certain that the problem was that the constraints did not translate well from my old version.

I've read this about TimeQuest: "The Generate SDC File from QSF command runs a Tcl script that converts the Classic Timing Analyzer constraints in a QSF file to an SDC file for the TimeQuest analyzer."

I liked the idea. Quick and easy. Unfortunately the conversion script bombed out with an error. I don't have my notes about the error with me but I remember that it wasn't too specific about what it was choking on.

The way I read it, the Quartus documentation implies that you can still use the Classic Timing Analyzer but this seems to be strongly discouraged and every path you take seems to turn towards TimeQuest. This is great but for a smallish modification to a reasonably complex old design that was actually working well in "classic timing mode", it's a nuissance. Using QII 10.1, the classic time constraints in QSF doesn't seem to do their job and conversion of constraints to TimeQuest crashes out. For this design, I think I'll stay with my ancient QII 6.1 for as long as I can.