A group of I/O pins that are grouped for the purpose of specifying I/O standards. Each I/O pin of the device is associated with a specific I/O bank, and the I/O banks are numbered. Pins that belong to the same I/O bank must use the same VCCIO signal and the same VREF signal if the I/O standard they operate at requires a VREF.

You can assign an I/O standard to the pins in an I/O bank by using the Assignment Organizer dialog box (Assignment menu), or by using the Pin Assignments dialog box which is available from the Device page of the Settings dialog box (Assignments menu), and you can view the arrangement of I/O banks in the Floorplan Editor. Only one VREF voltage level can be assigned to the I/O pins in any given I/O bank.