Jitter Filter

UltraScale Architecture Clocking Resources User Guide (UG572)

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1.10.2 English

MMCMs reduce the jitter inherent on a reference clock. The MMCM can be instantiated as a stand-alone function to only support filtering jitter from an external clock before it is driven into another block. As a jitter filter, it is usually assumed that the MMCM act as a buffer and regenerate the input frequency on the output (e.g., F IN = 100 MHz, F OUT = 100 MHz). In general, greater jitter filtering is possible by using the MMCM attribute BANDWIDTH set to Low. Setting the BANDWIDTH to Low can incur an increase in the static offset of the MMCM.