sheldon
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Subgold,
You have not really provided enough information to debug the problem. There are some other factors to consider, for example, there are some circuits that can cause issues for PSS. In the past, I have had trouble getting PLL to converge with the lock detect present since it has a hidden state. Another example would be a Pipeline ADC with a register to detect that the pipeline is full, another hidden state. Also have you tried APS-RF, my experience is that it has more robust convergence.
Best Regards,
Sheldon
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