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rodAlign a pcell in layout out of gird

nidon2003

Hello everyone,

I use cmd: rodAlign to place a pcell(AA) in a layout, as:

cellId=dbOpenCellViewByType("testLib" "testCell" "layout" "maskLayout" "w") 

instId=dbCreateParamInstByMasterName(cellId pdkName inst "layout" "inst_1" 0:0 "R0" 1)

rodAlign(

     ?alignObj  rodGetObj("inst_1" cellId)

    ?alignHandle  'lowerLeft

    ?refPoint  list(0 0) )

 

And the pcell(AA) is out of gird(0.005u), but if I use bindKey "i" to place this pcell in layout, it's no out if gird.

 I found that the refer point of cmd:rodAlign is the lowerLeft of the pcell, but the refer point of bindKey "i" is the origin in the pcell. And i think it maybe the reason.

Who can help me to work out this problem?

Thank you very much!

 

Lee 

 

  • theopaone

     Hi Lee

    You are correct, the lower left of the bounding box of the pcell master is not the origin but slightly off. The bounding box is determined by the contents of the master and when you do a rodAlign, you are aligning the bBox. Check the contents of the cell and you will probably see that the data is offset from one or both of the lower left edges, giving you the anomoly. 

    Ted

  • nidon2003

    Tks for your kindly respond, i rechecked my pcell and found the problem.

    And i searched more detail information by SKILL manul,  i found that you can directly specify the x:y in dbCreateParamInstByMasterName , then the pcell will be placed in layout refer it's origin.

    I think i should read more carefully, lol:

    Thank you again.

     

    Lee 

     

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