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Reserves the pin in one of five states: as an input that is tri-stated; as an output that drives ground; as an output that drives an unspecified signal; as SignalProbe™ output; or as a voltage reference or as a voltage reference (VREF).
The As VREF setting is not appropriate for all device families. For information on VREF support refer to the current device family data sheet, which is available from the Literature section of the Altera® web site..
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