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TimeQuest evaluates them the same way. The difference is in other tools(ASIC) where -asynchronous means they might have some interference with each other, such as cross-talk, where -exclusive clocks won't. But in TimeQuest you'll get the same analysis either way.
If going to Hardcopy(where ASIC analysis tools are used on the back end), you should use the right one. -asynchronous will give the more restrictive analysis though, so you can just default to that.
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Thanks, Rysc. Now I am still a little confused by the command "set_clock_groups", through this command, the clocks in group A will not be related with any clocks are outside this group. But could you give a clear definition, when we can say these two clocks are unrelated?
Thanks very much.
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