How to make sdc constraint in multiple clock in Asynchronous clock?

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u24c02

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Hi I have 2 question.

1. in this case, I have 16Mhz clock system and 2 derived clocks 4, 8Mhz.
What should I do to handle this clocks in SDC exactly?

2. in this case, I have 15Mhz clock system but derived clock are came from the outer source 3M, 7M,
What should I do to handle this clocks in SDC exactly?


Thanks for in advanced.
 

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