Quartus® Prime Standard Edition User Guide: Design Compilation

ID 683283
Date 10/22/2021
Document Table of Contents Merging Partitions

You can use the Merge command in the Design Partitions window to combine hierarchical partitions into a single partition, as long as they share the same immediate parent partition. Merging partitions allows additional optimizations for partition I/O ports that connect between or feed more than one of the merged hierarchical design blocks.

When partitions are placed together, the Fitter can perform placement optimizations on the design as a whole to optimize the placement of cross-boundary paths. However, the Fitter can never perform logic optimizations such as physical synthesis across the partition boundary. If partitions are fit separately in different projects, or if some partitions use previous post-fitting results, the Fitter does not place and route the entire cross-boundary path at the same time and cannot fully optimize placement across the partition boundaries. Good design partitions can be placed independently because cross-partition paths are not the critical timing paths in the design.