Description
During configuration, if VCCIO is withheld from any non-configuration(1) I/O bank, the bank will behave as described by Altera's hot socketing guidelines. The I/O pins in the unpowered banks will be tristated with the corresponding weak pull-ups disabled.
(1) It is possible to leave some banks unpowered although VCCIO must be applied to the I/O banks that contain configuration pins. If VCCIO is not applied to the configuration banks, configuration will not be successful.