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Joakim's avatar
Joakim
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

How to use D5_DELAY or D5_OE_DELAY on Cyclone V

I'm desperately trying to get the timing to work between my Cyclone V and an external CPU. Because of the clock delay, it seem to be impossible to get the timing to pass within one clock cycle, so I ...
Joakim's avatar
Joakim
Icon for Occasional Contributor rankOccasional Contributor
6 years ago

Thank you for your suggestion.

My concern with this solution is that the setup time will be too long, i.e. it will actually go high before the first rising edge of the clock (see picture).

I believe I was once told that using -hold 0 (or not specifying hold time), would help here, but I'm not sure how.

I would actually like to specify both a max time and min time for the setup, i.e. min 3.2 ns and max (10-hold time = 8.3 ns)(?)