Internal Error: Sub-system: MEM, File: /quartus/ccl/mem/mem_segment.cpp, Line: 766

Due to a problem in the Quartus® II software version 11.0 SP1, this error may be seen during Analysis & Synthesis when you compile a design targeting a Stratix® IV GX device.

To work around, turn off timing-driven synthesis by following these steps:

1. Open the Settings dialog box by selecting Settings on the Quartus II Assignments menu.
2. Select the categor Analysis & Synthesis Settings
3. Turn off the option Timing-Driven Synthesis in the Analysis & Synthesis Settings page

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