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How to create a mosfet pcell with auto-abutment capability

mike0317
 Hi, all.

I am currently working on some pcells under 90nm technology. And I have finished the mosfet without specifying its connectivities. Then I find the auto-abutment capability of virtuoso XL could be very useful for our project, so I followed the instructions in virtuoso XL user guide to alter my nmos pcell. However, no matter what I do, the abutment can never triggered, I have already opened the abut server, abut device and connectivity extractor options. I even tried the sample pcells of cadence, but still can not see abutment occur.

Therefore. I wonder could you please give me some detailed guidence about how to declare the pins of a mosfet pcell( such as G. S, D ) to meet the abutment requirements, and how to make auto-abutment happen? And how can I debug my skill code to find where I made mistakes?

Thank you very much!

Best wishes!

 

Mike

  •  Oh. I have been waiting for so long... Can anybody please help me?

    I think Auto-abutment is a very  important feature of virtuoso which could be useful in many applications. 

    Thanks again!

    Looking forward to your greatful help.

  • Some information can be found in sourcelink solution 11025584, but let me summarize here.

    The key thing is that you must have connectivity - you need pins on the objects. So, assuming that, it works this way:

    1. Create the abutFunction property on the pins (i.e. the pin object itself) to be abutted. For a MOSFET this would often be the diffusion pins, rather than metal pins - because the metal pins may not exist after abutment.
    2. The pin name (not the terminal name) must be kept before and after abutment - so generally speaking you'll want to give the pins well-defined and predictable names.

    Did you look in the vxlhelp manual <ICinstDir>/vxlhelp/vxlhelp.pdf ?

    Regards,

    Andrew.

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