Why do a small number of GND pins in the pin-out files of Stratix V, Arria V or Cyclone V devices have IO bank designations, whilst the rest do not?

Description

GND pins that have bank designations in the pin-out files of Stratix® V, Arria® V or Cyclone® V devices are defined as Programming Ground pins. They should be treated like all other GND pins on the device.