Description
This message may occur when Quartus® II integrated synthesis inserts an always-enabled tri-state buffer feeding logic that drives a pin designated in the source code as inout (bidirectional) and the pin is used only as an output.
You can safely ignore these warnings in this case, or you can eliminate the message by restructuring the source code so that the inout pin is declared as an output pin.
The warning messages may be improved in a future version of the Quartus II software.