5.1.12. Unused Pins
No Connect (NC) Pins
For vertical device migration, where the device package is the same but contains different density, you can leave the NC pins floating or connect to Vccio or to ground. You can refer to the device pin-out files for a list of NC pins.
Do Not Use (DNU) Pins
Do not connect these pins to power, ground, or any other signal. DNU pins must be left floating.
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