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Altera_Forum's avatar
Altera_Forum
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13 years ago

pll_lock does not lock but the pll works

Hello, If i'm not wrong pll_lock works by positive logic, so i have this problem: My PLL Works but doesn't lock, anyone knows why? http://i46.tinypic.com/11lshsg.jpg As you can see CLO...
Altera_Forum's avatar
Altera_Forum
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13 years ago

First point. I'm missing the term simulation in the question title. Failure in PLL simulation is definitely a different problem than "PLL not locking".

As said, the PLL model is simulating some locking delay (in a 10 µs range, if I remember right).

Finally, PLL simulation doesn't work with default ns Modelsim timescale, it has to be changed to ps.