Quad SPI flash IO Voltage

Hi there,

Is your device is Cyclone 10 LP or Cyclone 10 GX?

Since the configuration pin of the Cyclone 10 GX is powered by Vccpgm during configuration, I think your device is Cyclone 10 LP.

For Cyclone 10 LP device, the configuration voltage should be 3.3V or 3.0V based on your MSEL settings.

Please refer to the device handbook 6.3.1. MSEL Pin Settings.

https://www.intel.com/content/www/us/en/docs/programmable/683777/current/msel-pin-settings.html

and the KDB for VCCIO in bank 1:

https://www.intel.com/content/www/us/en/support/programmable/articles/000074744.html

Thanks,

Ethan