AR# 32950

11.1 PlanAhead - Why do I see infinite symbols as my slack value?

Description

Why do I see infinite symbols as my slack value in PlanAhead?

Solution

The infinite symbol is shown on TIG constraints in PlanAhead. This is expected and desired behavior. When a TIG constraint is applied to a path, the slack on that path is truly infinite.  

 

In a timing report, TIG constraints do not show "Slack", but report "Delay". This is because "Slack" is considered for timing violations; whereas, "Delay" is used to make several assumptions about the design and perform a calculation on a false path so that the report can at least display the paths information.

AR# 32950
Date 05/23/2014
Status Archive
Type General Article