When spread spectrum mode is enabled, the VCO frequency of the MMCM changes over time. These variations make it unsafe to perform timing analysis between two different outputs of the same MMCM, as the phase relationship between them is not constant.
When spread spectrum mode is enabled, the VCO frequency of the MMCM changes over time. These variations make it unsafe to perform timing analysis between two different outputs of the same MMCM, as the phase relationship between them is not constant.