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What's the source for these two clocks? Ideally you would have one clock come in and create both the 120 and 60 MHz clocks. Then everything works out(and TimeQuest will do what you want.) You don't even have to do Zero Delay Buffer.
It gets more confusing if they're two different clocks coming into the device, because you'll need to determine and phase difference and jitter between the external clocks and put that into your TimeQuest. If you explain the setup, there might be some more things to account for.
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The source of the 120 MHz one is external. The 60 MHz one I want to create from the 120 MHz one.
I can probably create two clocks from the 120: one 120 and another 60, and make them phase-aligned. Is this true?
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