Choosing Cyclone IV device/speed grade

Hi, from what I see online, the 402Mhz speed is mentioned on some of the distributor's website, but Altera's website did not mention the FMax (core performance) for these chips. Which makes sense, since the Core FMax depends on various factors such as the complexity of routing, available resource, etc.

If you would like to know whether slower chips (such as speed grade 8) will work with your design, try selecting them in Quartus and compile your design again. If you do not encounter any timing error (assuming of course, that you have constrained them properly) then the chip should work.

So far, I've only run up to 100-120Mhz on these Cyclone IV E chips... (with Nios)