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Problem building a slotted metal pcell

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Hi, I am trying to make a pcell that will create a big piece of metal with slots chopped out of it (for mechanical stress relief). I started with a prototype SKILL code that will create the slotted metal as an instance, and it worked ("prototype.il"). When put into pcell form, the pcell code compiles successfully. But the pcell instance can only have 14 slots max and fails otherwise. Warnings are always generated whether there is pcellEvalFailed or not. (I've appended the warnings generated to the end of "slot_pcell.il"). It seems that the database ID of the metal object becomes nil after being accessed repeatedly, so leChopShape stops working. (1) Could anyone help to point out what's wrong with the code/method? (2) I used leChopShape in the pcell, which is not a recommended function for pcells. Is there another way to make slots in layers? (3) In SKILL, is there a way to exit a loop prematurely, or skip some of the iterations (next/last functions) ? Thanks in advance :) KK


Originally posted in cdnusers.org by kkchen
prototype.il
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  • Andrew Beckett

    When you don't have a clue what you're doing, starting with code from a 9-year old post (from the old forums) which wasn't fully functional seems an odd thing to want to do. The post references some other code, which was probably lost during the translation from cdnusers.org (this was the code that created the PCell).

    I don't know how you've modified the code which is causing trouble when you're using it, but your subsequent calls to make_slot suggest that you have no knowledge of SKILL at all. You tried passing a variable name (met3) then a string ("met3") when the function is expecting a database object for the shape to be chopped. Also, the subsequent arguments don't take sense - they are supposed to be points, not single numbers.

    I suggest you start by reading the SKILL Language User Guide and maybe looking to attend a Cadence SKILL Language Programming training course (links under the Services menu at the top of the page).

    Kind Regards,

    Andrew.

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  • Andrew Beckett

    When you don't have a clue what you're doing, starting with code from a 9-year old post (from the old forums) which wasn't fully functional seems an odd thing to want to do. The post references some other code, which was probably lost during the translation from cdnusers.org (this was the code that created the PCell).

    I don't know how you've modified the code which is causing trouble when you're using it, but your subsequent calls to make_slot suggest that you have no knowledge of SKILL at all. You tried passing a variable name (met3) then a string ("met3") when the function is expecting a database object for the shape to be chopped. Also, the subsequent arguments don't take sense - they are supposed to be points, not single numbers.

    I suggest you start by reading the SKILL Language User Guide and maybe looking to attend a Cadence SKILL Language Programming training course (links under the Services menu at the top of the page).

    Kind Regards,

    Andrew.

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