In recent Altera® FPGAs, Tr and Tf are not specified.
Please refer to the following as well.
What are the recommended rise and fall time specifications for Altera® devices?
https://community.altera.com/kb/knowledge-base/what-are-the-recommended-rise-and-fall-time-specifications-for-altera%C2%AE-devices/338766
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Category:Specifications
Tools:-
Devices:-