Forum Discussion
Altera_Forum
Honored Contributor
Honored Contributorsynchronize pll
On CycloneII, is it possible to re-synchronize or start a pll on an async event such as a pulse? I have a 50Mhz pll clocked state machine that is triggered from a single external async pulse. I...
Altera_ForumHonored Contributor
Honored ContributorThis A/D does need close to 50% duty, so some of the circuit options won't work. The odd divider needs both pos and neg edge switching as the DDIO would use. I don't see any cyclone primitives with negative clocks so I wonder how they do that one and still be symmetrical. I'll try it if I can figure out how.
A clock doubler using a delay line primitive would simplify things but I don't see that either.
