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using auto-vias through SKILL

Leonardo Vinci

I have a list of bBoxes of path shapes of 0.05um width (M1, M2, M3 overlapping/stacked on each other) in my current hierarchy. I have dbIDs of shapes as well. I tried to use function "dbCreateViaShapeArray" but it requires calculations of how many vias we can place(and this could change upon different lengths of the overlapping paths, i could calculate the length of path by subtracting starting y and ending y from their bBoxes, but still it is not generalized for different path lengths).  And also it is not giving equal enclosures of both the ends of the paths. 

The requirement here for me is to use auto-via function somehow on these overlapping shapes somehow through SKILL code because auto-via is giving me required proper results. 

So, how to use auto-via on these overlapping path shapes to get the desired result.  

  • in reply to Quek

    Yes, i have. They are looking into the matter, the R&D team. 

    UPDATE: I used this function in VXL mode. They said that the issue is related to checkout and check-in of license each time this functions is executed, so when executed in loop for putting vias, it takes time. It takes check-out/in 12 tokens each time and thus takes time. Also, If i run Layout EAD, the same script runs quickly as i needed because there  it checks for license only once for the loop and not each time for the loop. Also they said that the engine for autoVia() GUi and viaGenerateViasAtPoint() is same but there is difference in the number of token usage, autoVia() takes 4 tokens, while viaGenerateViasAtPoint() takes 12 token for performing the same task.  The way this operation(viaGenerateViasAtPoint()) is designed to perform in VXL by Cadence is really very sad for the customers.     or anyone else, any comments on this? 

  • in reply to Leonardo Vinci

    Since you're already interacting with customer support on this, I'll let them comment rather than duplicating work (plus I'd have to research the details of what has been done via the support case that you didn't provide the number for).

    Regards,

    Andrew.

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