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The Dump LVS Button: Test Layout vs. Schematic

This function compares the netlists obtained from the physical and electrical data for the current cell, and lists topological and electrical differences. When the Dump LVS button is pressed, a small pop-up appears, which contains a field for setting the name of the output file, and has provision for setting the depth into the hierarchy to compare. The default name for the output file is the base name of the current cell, with a ``.lvs'' extension, and this will be written in the current directory unless a path is given to the file name. Entering 0 for the depth compares the current cell only, 1 compares the current cell and immediate subcells, and so on. The user is given a chance to view the output file upon completion.

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.



Subsections
next up previous contents index
Next: LVS Output File Format Up: The Extract Menu: Extraction Previous: The Dump Elec Netlist   Contents   Index
Stephen R. Whiteley 2006-10-23