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When doing post layout simulations, ncsim is given both sdf and library_model.v files. The library_model.v file has all the models + timings for the cells in the libraray. The default is 1ns for both setup and hold. When doing simulations using ncsim, are sdf values taken into acccount only and...
You can also use control signals originating from the domain the data is in . Synchronize using double FFs the control signal in the other domain and only then take the data in the other domain. Need to make sure that the data does not change after control signal is set in the first domain however.
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