Filter instances not connected to a net in layout

Prasad,

Are you using Virtuous Layout Suite XL? I potentially have a way of computing this based on incomplete net information in XL, but if you're not using XL then that approach won't work - so I didn't want to spend the time checking this approach unless it's likely to fit with your needs.

Of course, the annotation browser already shows incomplete nets in this case, but doesn't present it in terms of finding instances with incomplete nets.

Andrew

Hi Andrew,

yes, I'm working in XL. There are like 100 pins for a sub-cell and the signals were routed for 200um in top level with multiple metal jumps. After 200um, all of these routes needs to be connected to one buffer each. So, I'm writing a script to place the buffers close to their corresponding routing. I could select the shapes partially and arrange the buffers, but in that process the script is changing the position of the sub-cell that has 100 pins. So, I dont want the cell to be moved, only buffers should move. Please let me know the command to only select the instances with incomplete connection. 

Thanks,
Prasad 

Hi Prasad,

I threw this together, although it may not quite do what you want. This will return a list of any instance which has at least one pin that is unconnected. Note however that if there is a wire from the pin of the instance and the other end of that wire is unconnected, that won't show up in the list (that starts getting harder to detect, because you don't really know which instTerms on a net should be considered as connected to the net which are not (even if you started shape tracing, this might be difficult to determine, particularly for an internal net; would it be the instances connected to the biggest area of interconnect materials? I decided that this would get too complex and there was no clear answer). Hopefully this code is enough for you though:

procedure(abFindUnconnectedInstances(@optional (cv geGetEditCellView()))
    let(((unconnectedInstances makeTable('unconnected)))
        foreach(incompleteNet lceGetIncompleteNets(cv)
            foreach(marker lceGetIncompleteNetMarkers(incompleteNet)
                foreach(obj marker~>objects
                    when(obj~>objType=="instTerm"
                        unconnectedInstances[obj~>inst]=t
                    )
                )
            )
        )
        unconnectedInstances->?
    )
)

Regards,

Andrew

Hi Andrew,

Thanks for your reply. lceGetIncompleteNets and lceGetIncompleteNetMarkers commands helped me to identify the unconnected instances. 

Thanks,
Prasad