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Altera_Forum
Honored Contributor
Honored Contributorring oscillator as a clock
Hi, I am having a problem using 2 ring oscillators as 2 different clocks to 2 8-bit counters. When I use them separately they are working. But when I combine the two circuits in one design the out...
Altera_ForumHonored Contributor
Honored ContributorI presume, it's a trivial timing failure.
You didn't tell about the involve FPGA family, but besides the problems addressed by kaz, it seems like the frequency of your ring oscillator is beyond feasible clock speeds. Timing closure for the counters has to be evaluated manually because the timing analyzer isn't prepared to determine the frequency of ring oscillators.
