If computed wire capacitance is included in the electrical data, the capacitors will be recognized by virtue of having a special name prefix ``C@NET''" and treated specially. Unlike other devices, there is no corresponding physical device. If found, the values will be compared with the corresponding computed net capacitance in the physical data, and an error will be reported if the two numbers differ by 1 percent or more. Wire net capacitance is considered only for the capacitors that are found in the electrical data, i.e., if they are missing no error is generated.
When the LVS data are printed out, the hierarchy of the electrical (schematic) part is used as the basis. This means that
Thus, the schematic is favored, as anything not in the schematic and not connected physically is considered to be a ``test structure'' and is generally ignored. One of the reasons for this behavior is the potential existence of test cells and structures that might contain real devices or circuits, which aren't connected to anything but are used for process analysis. Generally, one would expect these to be ignored for LVS purposes.
However, unconnected physical subcells (cell instances) that contain extracted devices or subcircuits are explicitly checked for and listed. If the fail if unconnected physical subcells check box in the LVS panel is checked, the presence of unconnected physical subcircuits will force LVS failure of the cell. This check box tracks the state of the LvsFailNoConnect variable.