How is the Filtered Data Base (FDB) used?
A. The main feature of the FDB is that net data is entirely “free” of any virtual hierarchical boundaries imposed by the CAD database. The net can be captured from device terminal to device terminal, making no assumptions about dangling segments or drive loads. The FDB contains connectivity and geometrical information about a net, independent of how the net may traverse the design hierarchy. The FDB enables a designer to extract on a per-net basis, depending on the level of detail desired.
