Cyclone V Configuration Devices

This can be very problematic when you replace the flash to other models, voltage provided by different flash have different properties such as longer width and length of transistor require higher voltage theoretically to bypass the threshold(pinch-off).

Especially active serial, active means your fpga is master, that you need more voltage to push longer bits to destination/slave if your slave isn't really passive device, this is the physics behind. The cyclone V itself have max voltage of 3.9V, with 3.3V is from EPCQ256 itself and 2.5V simply won't run that EPCQ256 as well when serial. For parallel, yes, around equal or greater than 2.5V you can use already.

What you can play with is the voltage increment since you are very confident no wrong connection, overclocking should only shorten you device only if you turn on for a very long time which you can feel the temperature when touch or put thermometer on it. So, expecting you do it quick with overclocking to define whether this is the problem or not. Else, you may spend time comparing both flash datasheets. Are you running it on R&D since you want to replace other model to original model?

Best Regards,

Tzi Khang, Lim

(This message was posted on behalf of Intel Corporation)