timeQuest timing analayzer

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Hi All

I successfully finished a full processing analysis for my design circuit, the clock in timeQuest timing analayzer indicate that the (max. freq.=443.07 MHz) where the Restricted FMax. is 250(note; i used the cycloneiii famlly. As listed in the Appendix below) .How can I overcome this problem.

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You can't. It is basically saying that they really don't guarantee that anything will work correctly above 250 MHz.