When you use Xilinx/Concept, you must enable the HDL Direct option to ensure that your design writes out properly for the CONCEPT2XIL netlister.
When you add the appropriate lines to your startup.concept file before you start Concept, HDL Direct runs automatically when you save your design. Refer to the Concept Schematic User Guide for details. Also see the section on “Requirements for HDL Direct Compliance” in the HDL Direct User Guide.
