Honored Contributor
Honored ContributorHi,
Setting power optimization to extra-effort shouldn't hurt Fmax much -- typically its in the range of a couple %. That said, you probably shouldn't compile with this all the time. Just wait until you're nearly finished the design and have closed timing, then engage power optimizations. As for "inputs tri-stated" default and reduced drive strength, both of these were changed in 65 nm families. Why didn't we change old families? Because the way Quartus deals with "defaults" is that if you haven't overrided a default in your project, then if we change the default from one Quartus release to the next you will (silently) have the settings for your design changed. If we changed the default drive strength, for example, then anyone migrating a design where they (foolishly) havn't explicitly selected a drive strength would suddenly see a reduction in their I/O performance. Nice list. Regards, Paul Leventis Altera Corp.
