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Multi-part path makes cadence hang?

stuso

 Hi there,

i'm finding that my otherwise ok cadence session is fine UNTIL i draw or re-shape a multi-part path. This multpart path is for a guard ring so i suppose it may be relatively complex in that it does have around 4 sub paths and subtectangles for x5 rows of contacts.

I was wondering if this is a known issue. I have known multi-part paths to casue me issues in various versions of cadence in the past, in that cadence would completely stall and not come back. Howeve in this case it does come back alive after 5mins or so.

My current cadence version is: IC5141_ISR200806270515

Thanks

Stu 

 

 

 

Parents

  •  Hi Stu,

    You could consider re-implementing the MPP as a PCell; use the enterPath function to gather the points and provide a "rubber-band" outline of the guardring/path, you will not see the details this way, only the outline. Inside the PCell you could use rodFillBBoxWithRects() to create the contact shapes as regular dbObjects without the ROD overhead.  I wrote a MultiPartPath example that uses enterPath to gather the points and then pass on to a creation function (in that case it was not a PCell, but a wrapper to the rodCreatePath() function).  In fact what I am suggesting would not have to be a PCell, you just have a drawing routine that perhaps uses an MPP for the path parts and rodFillBBoxWithRects() for the contact parts.

    Look in SourceLink for CCSslotMetal() for the example I mention above. How can I create slotted metal paths?

    Hope this helps!

    Regards,

    Lawrence.

Reply

  •  Hi Stu,

    You could consider re-implementing the MPP as a PCell; use the enterPath function to gather the points and provide a "rubber-band" outline of the guardring/path, you will not see the details this way, only the outline. Inside the PCell you could use rodFillBBoxWithRects() to create the contact shapes as regular dbObjects without the ROD overhead.  I wrote a MultiPartPath example that uses enterPath to gather the points and then pass on to a creation function (in that case it was not a PCell, but a wrapper to the rodCreatePath() function).  In fact what I am suggesting would not have to be a PCell, you just have a drawing routine that perhaps uses an MPP for the path parts and rodFillBBoxWithRects() for the contact parts.

    Look in SourceLink for CCSslotMetal() for the example I mention above. How can I create slotted metal paths?

    Hope this helps!

    Regards,

    Lawrence.

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