Max10 speedgrade 8 and DDR2 memory

Hi,

The MegaWizard tells me that Max10 speedgrade 8 devices are not supported for DDR2 memory interface generation in general.

I've now targeted a speedgrade 7 device and created the RAM interface successfully (at least I think so as TimeQuest reports OK and I have no hardware available yet to test it in reality).

If I then switch back my design to a speedgrade 8 device and recompile it using the previously generated memory interface, TimeQuest still reports positive slack.

So, for now I have two tools reporting two different results.

Is TimeQuest currently not testing properly?

Is the MegaWizard as well as the online memory selector guessing too pessimistic as the result (speedgrade 8 not supported) does not depend on clock frequency and RAM delay settings?

Or what did I do wrong?

Best regards,

tfranke