Solution ID: rd03032012_642
Last Modified: Sep 11, 2012
Product Category: Design Software
Product Area: Timing Analysis
Product Sub-area: TimeQuest Timing Analyzer
Version Found In: v10.0
Software: Quartus II Linux,Quartus II PC
Why does the Quartus II software report unconstrained paths when running quartus_sta with the --sdc option to perform timing analysis?
You may observe Quartus® II software report unconstrained paths while running quartus_sta with the
--sdc option to perform timing analysis. This behavior may occur even though there are no unconstrained paths when running a full compilation. If you use the
--sdc option for the
quartus_sta command, the software uses only the constraints in the specified Synopsys Design Constraints (.sdc) file for timing analysis, but not the embedded timing constraints in your design files.
Workaround / Fix
To avoid this behavior, do one of the following actions:
- Include the command
read_sdc -hdlwithin your specified .sdc file to have the software use the embedded constraints.
- Remove the
--sdcoption. Without the
--sdcoption, the software performs timing analysis using the embedded constraints in design files and the .sdc files in your project.
Altera does not warrant that this solution will work for the customer's intended purpose and disclaims all liability for use of or reliance on the solution.