Occasional Contributor
Super ContributorThe timing models in the Timing Analyzer are fixed and meant for the extremes of device operation. If your design meets timing at those extremes, it will work at the in-range temperature you run at.
Certain devices have additional models if your device is industrial or military grade that go beyond the standard commercial grade models. You can access these models in the operating conditions section of the Timing Analyzer.
The junction temperature setting you probably are referring to is for power analysis, not timing, though I'm not sure why that would cause your design to fail synthesis. What error(s) did you get?
