3.4. Guidelines: Configuration Constraints
The I/O PLL configuration must obey the following constraints:
- The phase frequency detector (PFD) and VCO each have a legal frequency range of operation.
- The loop filter settings must be appropriate for the M counter value and user-selected bandwidth mode.
If any of these configuration constraints are violated, the I/O PLL may fail to lock or may exhibit poor jitter performance.
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