Honored Contributor
Honored ContributorHi,
I doubt that this is what you want to hear, but please assign the pins manually. I mean, what's the point? You've got to develop and manufacture a PCB eventually, then fixed pin assignments are mandatory anyway (imagine you re-synthesize your design and the pins don't match your PCB any more!). I assume you just wanted to quickly synthesize your preliminary design to see if it fits into the FPGA. That's fine without pin assignments. Even though no one can guarantee the same performance once you've assigned the pins. But then just ignore that warning, and resolve it when you assign the pins. Also, keep in mind your FPGA only has so many I/O banks. If you need different I/O standards (e.g. some with 3.3V, some with 2.5V, etc.), I strongly recommend to settle on some pin assignments in an early stage. Otherwise you might be surprised that you'll run our of pins (in one of my designs I also had plenty of excess pins, but only very few of them were 2.5V while the others were 3.3V and 1.8V, wasting almost around 40 unusable 2.5V-pins). Best regards, GooGooCluster
