Internal Error: Sub-system: FSV, File: /quartus/fitter/fsv/fsv_module_oct.cpp, Line: 653 too many OCTs - Internal Error: Sub-system: FSV, File: /quartus/fitter/fsv/fsv_module_oct.cpp, Line: 653 too many OCTs Description If you compile a design that uses the Differential 1.2-V HSUL standard, compilation fails with the error: Internal Error: Sub-system: FSV, File: /quartus/fitter/fsv/fsv_module_oct.cpp, Line: 653 too many OCTs Resolution Review the number of calibration blocks required by your design, and merge them using the TERMINATION_CONTROL_BLOCK assignment. Custom Fields values: ['novalue'] Troubleshooting novalue True ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 11.0 ['Stratix® V FPGAs'] ['novalue'] ['novalue'] ['novalue']