TMC-20002: Timing Paths with Removal Slack Exceeding Threshold
Description
Violations of this rule identify timing paths with removal slack below the slack threshold parameter. Timing paths with a very large negative removal requirement complicate timing closure and may cause excessive run times. Such paths are likely invalid, and require appropriate timing constraints.
Parameter
| Name | Default Value | Description |
|---|---|---|
| removal_requirement_threshold_level | -0.5 nS |
A violation is reported for timing paths that have slack more negative than the value of this parameter. |
Recommendation
Ensure that each timing path is valid, and apply SDC constraints to cut the path or adjust its slack. For example:
- set_clock_groups constraint can avoid invalid clock domain crossing paths.
- set_false_path constraint marks invalid timing paths.
- set_multicycle_path constraint adjusts clock edges of a multi-cycle path.
Severity
High
Stage
Plan
Device Family
- Intel® Stratix® 10
- Intel® Agilex™
- Intel® Cyclone® 10 GX
- Intel® Arria® 10