generate_paths (GCF)

Modifies the way Designer generates internal path constraints for the placer to do timing-driven placement.

generate_paths [-cover_design] [-max_paths <maxpaths>] [-top <percentage>];

Arguments

[-cover_design]

Specifies to Designer to use the cover design algorithm instead of the default worst paths algorithm.

[-max_paths <maxpaths>]

Specifies the maximum number of paths that will be generated (default is 20% of the number of nets with minimum of 1000 or if cover_design is specified, twice the number of nets with a minimum of 1000).

[-top <percentage>]

Specifies the top percentage of worst paths that will be generated (default is 20%).

Supported Families

ProASIC

Description

The cover design algorithm ensures that the generated set of paths span the entire design; every pin of every instance participates in at least one path.
After the timing analysis is done, the worst paths algorithm starts recording the signal paths starting from the worst slack. It stops after some number of paths is generated; as a result, only some part of the design may be covered by the paths.

Exceptions

None

Examples

The following statement generates 4,000 maximum paths using the -cover_design algorithm.