Internal Error: Sub-system: SSC, File: /quartus/tsm/ssc/ssc_timing.cpp, Line: 459

Description

Due to a problem in the Quartus® II software version 12.0 and later, you may see this error during synthesis if you turn on timing-driven synthesis, but all the logic in the design is removed during synthesis optimization.

Resolution

To work around this problem, ensure that logic remains in your design after synthesis optimization or turn off timing-driven synthesis.

This problem is scheduled to be fixed in a future release of the Quartus II software.