Internal Error: Sub-system: ASMIO, File: /quartus/comp/asmio/asmio_reg.cpp, Line: 2388 - Internal Error: Sub-system: ASMIO, File: /quartus/comp/asmio/asmio_reg.cpp, Line: 2388 Description Due to a problem in the Quartus® II software version 13.0 and earlier, you may see an internal error with line number 2388, 2390, or 2391 if you have an output enable on a differential output. This configuration is not valid in Altera® devices, but Stratix® V, Arria® V, and Cyclone® V devices do not include this legality check. Resolution To work around this issue, do not use an output enable on a differential output. Future releases of the Quartus II software are scheduled give an error message for this incorrect implementation. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 12.1 ['Arria® V GT FPGA', 'Arria® V GX FPGA', 'Arria® V GZ FPGA', 'Arria® V ST FPGA', 'Arria® V SX FPGA', 'Cyclone® V E FPGA', 'Cyclone® V GT FPGA', 'Cyclone® V GX FPGA', 'Cyclone® V SE FPGA', 'Cyclone® V ST FPGA', 'Cyclone® V SX FPGA', 'Stratix® V E FPGA', 'Stratix® V GS FPGA', 'Stratix® V GT FPGA', 'Stratix® V GX FPGA'] ['novalue'] ['novalue'] ['novalue']