--- Quote Start ---
power up Power up all the power supplies that are monitored by the POR circuitry. All power supplies, including VCCPGM and VCCPD, must ramp up from 0 V to the recommended operating voltage level within the ramp-up time specification. Otherwise, hold the nCONFIG pin low until all the power supplies reach the recommended voltage level.
--- Quote End ---
You should consider to select standard POR delay (100 ms) instead of fast (4 ms) in MSEL if you have problems with power supply ramping.
I remember there have been problems with previous Cyclone families and non-monotonous power supply startup which could cause wrong latching of MSEL coding under circumstances. Not sure if it could still occur with Cyclone V. Nevertheless I would check all power supplies statically and dynamically.
Honored Contributor
