Description
The Quartus® II software version 8.0 and earlier may generate this internal error during an incremental compilation when you use the SignalTap® II Logic Analyzer to tap bidirectional or output signals.
To avoid this error, tap into the nodes that are feeding or driving the bidirectional and output pins; do not directly tap into the bidirectional or output pins.
This issue has been resolved in the Quartus II software version 8.1.