Andrew (or anybody),
If an instance symbol is modified after the schematic last modification, cadence will give you warning in CIW when you open the schematic. I want to write a skill code to check the schematic for the same purpose? Initially I thougt cadence only compare the timeStamp of the schematic and the instance symbol. But I found cadence does more than that. They can capture the symbol change even if I rollback to a old sybmol version (with earlier timestamp). Can you tell me how Cadence capture the instance symbol change when you open the schematic?
In IC6.1.x you can check if the schematic needs re-extraction by using dbIsConnCurrent, the view does not have to be opened for edit. If you have write permission to the cellView you can run schCheck on the cell and it should correct the issues. I'm not sure what the database is checking but there is a edit counter on the master that is whose value is also associated with the instance, possibly on the instHeader. These numbers have to be in sync.
Thank you for your reply. I tried dbIsConnCurrent. It checks different thing. My current schematic has one instance symbol changed. When I open it ready-only. CIW shows a warning said symbol changed after last schematic save. But dbIsConnCurrent still give me 't'. I also checked the instHeaders for glues, but have not found anything related.
I don't have access to Virtuoso right now so I can't track down where the data would be found. I don't think you can eliminate that error as once the error has been marked, it must be cleared by the tool and is not "fixable" by the user.