General Description: By default, back-annotated netlists are flattened by the NGD2EDIF utility, which is run by the Flow Engine during implementation. Is it possible to generate a netlist that preserves hierarchy?
Yes -- follow the steps below:
1. In the Foundation Project manager, select Tools -> Simulation/Verification -> Checkpoint Gate Simulation Control. The Checkpoint Simulation Dialog box will appear.
2. Select the desired version and highlight the .ngd file.
3. De-select the Flat Netlist box, and click "OK". This re-runs NGD2EDIF with a switch that preserves hierarchy, then launches the simulator upon completion.