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How to retrieve via spacing of a 2x2 customVia in Virtuoso?

chianga

Hi, 

I am trying to write a SKILL routine that increase and descrease number of vias with bindkeys.  I got the routine to work with stdVia but I am running into some problems with customVias.  In stdVia, you can retrieve cutspacing by using the following command:

stdVia=car(geGetSelSet()) 

stdVia->viaHeader->overrideParams

which outputs  ("cutSpacing" (0.07 0.07)) along with other via information

However, when I use the same command on a 2x2 customVia, there is no cutSpacing information.  I noticed this only happens on a 2x2 via, when a via is 3x3 or bigger the cutSpacing information does appear under overrideParams.

 I am wondering if anyone knows why this is the case and if there are other ways I can retrieve the spacing information.

 

Thanks,

Andy

 

 PS I am using IC6.1.5-64b.500.12

 

Parents

  • Andy,

    With a custom via, the exact parameter is dependent upon the implementation of the custom via. In the one I tried, the parameters are called yCutSpacing and xCutSpacing - and are only set in overrideParams if they've explicitly been altered (i.e. increasing the rows and columns doesn't alter them - I don't really see why it would know; that intelligence would normally be built into the pcell, I'd have thought).

    So you might be able to work it out from other technology constraints - but it is likely to be very dependent upon the implementation of the custom via.

    Regards,

    Andrew.

Reply

  • Andy,

    With a custom via, the exact parameter is dependent upon the implementation of the custom via. In the one I tried, the parameters are called yCutSpacing and xCutSpacing - and are only set in overrideParams if they've explicitly been altered (i.e. increasing the rows and columns doesn't alter them - I don't really see why it would know; that intelligence would normally be built into the pcell, I'd have thought).

    So you might be able to work it out from other technology constraints - but it is likely to be very dependent upon the implementation of the custom via.

    Regards,

    Andrew.

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