Error (35000): Port does not exist in the interface of the partition

Description

Due to a problem in the Quartus® II software version 13.0, you may see this error if your Verilog HDL code contains a clock mux whose output connects to both an output pin and internal logic.

Resolution

To work around this problem, create an additional wire so that the output has a different name from the clock that is used internally.

This problem is scheduled to be fixed in a future release of the Quartus® II software.