check the instance symbol change in 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.

 Ted

Ted,

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.

I realize this topic is quite old but I'm trying to do the same thing. I open a cellview for read and need a skill function to determine if it requires check & save for any reason. Has anyone figured this out and care to share?

Thanks,
- Phill

Hi Phill,

Well, dbIsConnCurrent() will tell you if the cellView has been modified since it was last "extracted" (i.e. the last check). To see if there are any symbols which have been modified since the last time it was checked, use:

modifiedInstHeaders=setof(instHeader cv~>instHeaders instHeader~>masterChangeCount!=instHeader~>master~>modifiedCounter)

From this you can glean the libName/cellName (and instances) which would give you a warning in the CIW or show with markers had you opened the schematic in edit mode. What the incantation above does is check if the record of the last modifiedCounter on this schematic for each master instantiated matches the current state of that master.

Regards,

Andrew.

This worked perfectly for me. Thank you for the quick help!

- Phill

Hi Andrew,

I was trying to get a notification email  about the symbols updated since last time it was checked, For that i was first checking which all symbols was updated using

modifiedInstHeaders=setof(instHeader cv~>instHeaders instHeader~>masterChangeCount!=instHeader~>master~>modifiedCounter). 

I got an error - *Error* eval: unbound variable - cv

Please help me how to proceed.

Regards,
Amul

Hi Amlu,

cv is the variable that stores the CellView database ID, so you need to have defined it earlier, the above is just a snippet. example:

cv=dbOpenCellViewByType("libName" "cellName" "viewNamw")

modifiedInstHeaders=setof(instHeader cv~>instHeaders instHeader~>masterChangeCount!=instHeader~>master~>modifiedCounter). 

Hi,

I tried using below lines:

cv=dbOpenCellViewByType("libraryName" "cellName" "viewName")
modifiedInstHeaders=setof(instHeader cv~>instHeaders instHeader~>masterChangeCount!=instHeader~>master~>modifiedCounter)

I get  'nil' all the time, even if there is updated version of the symbol have been checked in.

Regards,
Amul

Is the libraryName cellName and viewName  on the first line for the schematic view that contains the symbols? The idea is that it will check if any of the symbols used in that schematic have been changed since the last time the schematic was "checked". 

You can't just give it the lib/cell/view of a symbol view - that makes no sense.

I'm trying to guess what you might have done wrong...

Andrew.