General Description: When I perform a functional simulation in Foundation with a design containing multiplexors that use 3-state buffers or LogiBLOX-generated multiplexers, a window pops up during simulation that is titled "Bus Conflicts".
This is a known issue with the Foundation logic simulator, and the warning message that is generated can be safely ignored.
When a LogiBLOX mux is generated with more than four inputs, the default is to implement the mux using 3-state buffers. The simulator has difficulty interpreting the buffers and generates the "Bus Conflicts" error.
You can simply ignore the warnings that pop up, and click on "Cancel".
However, for timing simulation, you should examine the source of conflict and the duration.