Why is the Invert Signal menu option disabled in the SignalTap II Logic Analyzer? - Why is the Invert Signal menu option disabled in the SignalTap II Logic Analyzer? Description Due to a problem in the Quartus® II software version 11.1 SP2 and earlier, the Invert Signal menu option is disabled in the SignalTap™ II Logic Analyzer. Resolution To work around this problem, close the GUI and edit the SignalTap II Logic Analyzer ( .stp ) file in a text editor. Find the line for the signal you want to invert such as: <net is_signal_inverted="no" name=" <signal name> "> Change the "no" to "yes" and save the file. Re-open the SignalTap II Logic Analyzer GUI. The signal is inverted. This problem is fixed beginning with the Quartus II software version 12.0. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] 12.0 10.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']