You can configure the incremental flow using the config_implementation
command. To view the default and current values of
this command use the report_config_implementation
command. To update these values use the config_implementation
command. Following is an example:
report_config_implementation
config_implementation { {incr.ignore_user_clock_uncertainty true} }
Note: You can update more than one element
at a time by grouping key value pairs in the same method shown above within the outer
brackets.
You can configure the following:
- Minimum thresholds for cell matching, net matching, and WNS in the automatic incremental flow.
- Behavior of both synthesis and implementation when the automatic
incremental flow criteria is not met. This check happens at the beginning of the
synthesis run and during
read_checkpoint -incremental
for implementation. It can be set toTerminate
which stops the flow orSwitchToDefaultFlow
which exits the incremental flow but continues with default flow settings. - Whether the flow ignores user clock uncertainty constraints that are typically used to overconstrain the placer and force closer placement.