Hi,
As the name indicates, cross clock domain refers to paths from one clock domain to other clock domain.
In ISE, analysis is done on related clock domains by default (input clock to mmcm/dcm and its output clocks are related). If you want to constrain unrelated cross clock domains you need to use FROM TO constraints.
Refer to UG612 for more details.
Thanks,
Deepika.
Thanks,
Deepika.
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