Honored Contributor
Honored ContributorCan you post the different results? Do a report_timing with -file "TQ_results.txt" for each one and attach, pointing out the difference? (I wouldn't be surprised if the uncertainty is different, but that's it and should be a small difference)
For source-synchronous, Tco isn't really the correct spec. What you really want to enter is the data pin's skew in relation to the clock. For example, let's say the Data has a Tco of 4ns while the clock has a Tco of 3.5ns. We don't want to enter a set_input_delay of 4ns, but of 0.5ns(Plus any board skew). Conversely if the data has a min Tco of 3ns and the clock is still 3.5ns, then the set_input_delay -min is -0.5. I was kind of thinking that's what you meant when entering Tco and -Min Tco for your values, but wanted to be explicit.
