Modifying an extracted view for post layout simulation.

You can use:

dbSetConnCurrent(geGetEditCellView())

and then save it. Note that this should obviously be done with caution because you may be destroying the integrity of the connectivity when you are editing the extracted view.

Regards,

Andrew.

 Thank you very much Andrew.

wow fantastic trick!

 This saves editing the extracted netlist and doing a command line run simulation. Could this not be incorporated into the Parasitic Aware Design flow? With a health warning I agree. I found it useful as my layout effort is in a different time zone and when I found the extracted view was damaging my performance more than expected  I wanted to alter the design to make it more robust against the layout effects. A quick change to a device parameter within the extracted view then seeing if this has helped the extracted simulation result before issuing the change to layout is so useful

The idea is that you ought to be able to use the parameterisation flow to (e.g. the Variables and Parameters) assistant to do these "what if" experiments, but currently it's not possible with extracted views. But it's being looked into...

Andrew.

 Hi Andrew,

what's the equivalent command in ic6?

Thank you.

It's the same. dbSetConnCurrent(geGetEditCellView())

Andrew.

 Hi Andrew,

 I would like to know if there is another ( new??) possibility to simulate an extracted view which was modified by me. In fact, I use Cadence 5 because I use an old version of PDK technology and, when I choose to delete some parasitics on the extracted view, a message appear which is :  "ERROR (OSSHNL): Error(s) found during netlisting. The netlist may be corrupt or may not be produced at all. To generate correct netlist, fix the errors and re-netlist." I 've seen on your previous topic that we can use the command "dbSetConnCurrent(geGetEditCellView())" to solve this probleme but it doesn't work in my case. Besides, It appear a new error message : " Message: *Error* dbSetConnCurrent: argument #1 should be a database object (type template = "d") at line 20 of file "*ciwInPort*" Entering new debug toplevel due to error ". So, I would like to know if I can fix that problem.

 Regards

 Kamel

Kamel,

For the dbSetConnCurrent call I suggested to work, geGetEditCellView() needs to return the dbId of the cellView. This means that you must have the extracted view open, editable, and also the window must be the current window (select one of the pulldown menus in the window to force this). I suspect it isn't the current window, and so maybe geGetEditCellView() is returning nil.

Also bear in mind that removing the parasitics might leave the circuit open-circuit (if it is resistors that you have removed).

Regards,

Andrew.

Andrew,

Thanks for the reply. Now, I can simulate my modified extracted view without problems. In reality, the problem was that the extracted view was not opened/editable during the simulation.

Appreciate your help.

Regards

 Hi Andrew,

Do you know how to probe an extracted view after a simulation? 

I'm simulating a cct including an extracted sub-block.  Clearly, it's possible to probe the t op level schematic to look at signals going into and coming out of this sub-block. Is there an easy way of probing the inside of this block on the extracted view?

I have tried saving the nodes and paths I'm interested in on the schematic view of this sub-block, but don't seem to be able to select or save nodes and paths on the extracted view.

Could you help?

Thank you.