| CAUSE: | In a Block Design File (.bdf) or Graphic Design File (.gdf), the specified bidirectional pin is connected to a named signal, but the named signal has no source other than the bidirectional pin. Each bidirectional pin must be connected to a source signal. |
| ACTION: | The Quartus II software will connect the bidirectional pin to GND. To avoid receiving this message in the future, connect the bidirectional pin in the design to a source signal, or delete the bidirectional pin if it is not used. |
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