Intel® Quartus® Prime Standard Edition User Guide: Design Optimization

ID 683230
Date 11/12/2018
Document Table of Contents Flatten the Hierarchy During Synthesis

Synthesis tools typically let you preserve hierarchical boundaries, which can be useful for verification or other purposes. However, the best optimization results generally occur when the synthesis tool optimizes across hierarchical boundaries, because doing so often allows the synthesis tool to perform the most logic minimization, which can improve performance. Whenever possible, flatten your design hierarchy to achieve the best results.
Note: If you are using Intel® Quartus® Prime incremental compilation, you cannot flatten your design across design partitions. Incremental compilation always preserves the hierarchical boundaries between design partitions. Follow Intel’s recommendations for design partitioning, such as registering partition boundaries to reduce the effect of cross-boundary optimizations.