Hierarchical Design - 2023.2 English

Vivado Design Suite User Guide: Design Flows Overview (UG892)

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2023.2 English

Hierarchical Design (HD) flows enable you to partition a design into smaller, more manageable modules to be processed independently. The hierarchical design flow involves proper module interface design, constraint definition, floorplanning, and some special commands and design techniques.

Using a modular approach to the hierarchical design lets you analyze modules independent of the rest of the design, and reuse modules in the top-down design. A team of users can iterate on specific sections of a design, achieving timing closure and other design goals, and reuse the results.

There are several Vivado features that enable a hierarchical design approach, such as the synthesis of a logic module outside of the context (OOC) of the top-level design. You can select specific modules, or levels of the design hierarchy, and synthesize them OOC. Module-level constraints can be applied to optimize and validate module performance. The module design checkpoint (DCP) will then be applied during implementation to build the top-level netlist. This method can help reduce top-level synthesis runtime, and eliminate re-synthesis of completed modules.