Error: <filename>: (vcom-1136) Unknown identifier "implement_input_in_lcell" - Error: <filename>: (vcom-1136) Unknown identifier "implement_input_in_lcell" Description Due to a problem in the Quartus® II software version 10.0 and later, you may see the error message in the ModelSim-Altera Edition software version 6.5e when you simulate an ALTDDIO_IN megafunction variation file generated in VHDL. To work around the problem, comment out the following line in the VHDL variation file ( .vhd ) referenced in the error message generated by the ModelSim-Altera Edition software: implement_input_in_lcell => "ON" This problem will be fixed in a future version of the Quartus II software. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']