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.