Exporting the Valid Exceptions - 2021.2 English

Vivado Design Suite User Guide: Design Analysis and Closure Techniques (UG906)

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2021.2 English

The Report Exception command can export the list of timing exceptions. Only the constraints that cover at least one path are exported. Only valid startpoints and endpoints pins are exported while the patterns used to specify the timing exceptions are expanded inside the Vivado Design Suite Timer memory. This report can be used in conjunction with the coverage report to help refine the patterns and collections of objects used to define the timing exceptions.

Note: Timing constraints set_clock_group and set_bus_skew are not exported.

The following figure illustrates report_exceptions -write_valid_exceptions on the two False Path constraints explained in the section Reporting the Ignored Objects.

Figure 1. Valid Exceptions