Forum Discussion
bitwise
Occasional Contributor
6 years agoThe ignored SDC was constraining skew across a group of signals, but the specific signals don't exist in your design. The assignment is thus ignored, and since the specified signals don't exist the fact that they won't have constrained skew is innocuous. If you open the Timequest GUI and run the diagnostic report to tell you what constraints were ignored then it should tell you if this ignored constraint was in your SDC file or embedded in HDL.