The result from .PAR and from .TWR is expected to be different. For Radiant 2023.2, multi-corner timing analysis is implemented, the idea is for:
A. 2023.2
1) PAR Timing Analysis (.PAR)
- The Timing model used is the model with "WORST" case at various corners
- Timing Report by PAR is an estimate that is typically WORSE than the actual timing of the design.
2) STA Timing Analysis (.TWR )
- In comparison to PAR Timing, STA Timing provides the actual timing of the design, where SETUP is done at Low(0 or -40) and High Temperature(85 or 100 or 125) at user speed grade while HOLD is done at Low temperature (0 or -40) at m Speed grade.
Users should always refer to the .twr or Timing Analyzer for the actual timing of your design. Similarly, note that the PAR Timing results should be smaller than the STA timing due to the above details.