I'm sure this should be obvious, but I'm afraid it isn't, either to me or to google. What is the difference between timingan and trce, other than the gui versus command line interface? Is trce just a back-end for timingan? I see that trce is documented in the Development System Reference Guide, but there seems to be no corresponding mention of timingan in those docs, even when I search all of the .pdx indexes.
I was also led to believe that timingan changed somewhere along the way, and combining that with someone's assertion that timingan and trce use different timing models, I'd like to find out whether these tools do in fact generate identical timing results in ISE 10.1 and later.