TMC-20002: Timing Paths With Impossible Removal Requirement

Timing paths with a very large negative removal requirement (greater than -0.3 nS) complicate timing closure and may cause excessively long run times.

Such paths are mostly invalid and require appropriate timing constraints, such as:

  • set_false_path for invalid timing path or
  • set_multicycle_path to adjust clock edges of a multi-cycle recovery path.
Note: The removal_requirement_threshold_level rule parameter filters out hold paths with more stringent timing requirements (that is, a smaller slack value). Specify a negative value for this parameter that is a specific fraction (for example, 50%) of the design's clock period to multiple clock cycles.


Name Default Value Description
removal_requirement_threshold_level -0.5 nS

A violation is reported for timing paths that have removal time requirement more stringent than the value specified for this parameter.


Ensure that it is a valid timing path. Otherwise, consider an appropriate exception (set_false_path or set_multicycle_path) or restructure the path.





Device Family

  • Intel® Stratix® 10
  • Intel® Agilex™
  • Intel® Cyclone® 10 GX
  • Intel® Arria® 10