oIncorrect Nets / Connectivity Errors: This section details discrepancies in how nets are connected.
Shorts: When Schematic has more nets but layout has less nets, layout has short.
Opens: A single net in the schematic corresponds to two or more unconnected nets in the layout.
Incorrect Instances / Devices: Discrepancies in the number or type of devices.
Missing Devices: A device present in the schematic is not found in the corresponding location/netlist in the layout.
Extra Devices: A device extracted from the layout has no corresponding instance in the schematic. Debugging: Check if the device was accidentally deleted/added in the layout or schematic, or if the LVS tool misidentified a structure due to layout errors near the device.
Incorrect Ports: Mismatches in the number or names of top-level ports between schematic and layout.
Parameter Mismatches (Property Errors): Devices match in type and connectivity, but their calculated parameters (e.g., transistor Width, Length, Resistor value, Capacitor value) differ between schematic and layout beyond a specified tolerance.
Non-equivalent Points: This is a general term often used in the summary indicating the LVS check failed. The detailed sections (Incorrect Nets, Instances, Properties) provide the specifics.
- LVS Report Interpretation: https://www.ijraset.com/fileserve.php?FID=25120 (Practical Approach to LVS paper)