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The Altera documentation states that *all* paths should be constrained (even internal paths). How do i handle this? I would assume that Quartus II *knows* the tsu and th of all internal registers and that I, as user, would not have anything useful to add to the equation. Is it required to add a "default" tsu and th to all internal paths?
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Quartus does know the micro tsu, th, and tco of all internal registers, but the internal paths are not constrained unless you have a clock constraint as batfink said. Run "Report Unconstrained Paths" and "Check Timing" to see if you are missing any constraints.
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