Exporting the Valid Exceptions - 2025.2 English - UG906

Vivado Design Suite User Guide: Design Analysis and Closure Techniques (UG906)
Document ID
UG906
Release Date
2025-12-10
Version
2025.2 English

You can use the report_exceptions -write_valid_exceptions command to export only the timing exceptions that cover at least one valid timing path. This export includes the following:

  • Only valid startpoint and endpoint pins
  • Expanded object collections, as resolved in memory by the Vivado timer
  • Constraints that are actively applied to timing paths

Usage Notes

  1. The export excludes timing constraints created with set_clock_groups and set_bus_skew.
  2. Use this report with the coverage report (-coverage) to refine the object patterns used in your timing exceptions.
  3. This helps ensure your constraints are both effective and targeted to meaningful paths.

Example

The following figure illustrates report_exceptions -write_valid_exceptions from the case described in Reporting the Ignored Objects, where two set_false_path constraints were applied:

Figure 1. Valid Exceptions