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SPI-4.2 Lite v5.1 Rev2 & SPI 4.2 v9.3 Rev2 - MMCM might not lock, causing a failure in simulation using VCS
Due to a known problem, the MMCM might fail to lock when performing a timing simulation in VCS which can cause the example design to fail. Functional simulation does not expose this problem.
This issue is scheduled to be fixed in ISE software 12.1. Meanwhile, the only work-around is to use another simulator, such as MTI.
- SPI-4 Phase 2 Interface Solutions