How does TimeQuest Analysis determine Launch edge & Latch edge?

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Asynchronous transfers are generally out of the realm of static timing analysis and up to the user to properly design for, so that the circuit can handle "any relationship" between the clocks/data and still work. An asynchronous FIFO does this. Handshaking schemes usually do this. There are other situations(like synchronizing an asynchronous signal, etc.).

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