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Off-Grid pins warning in abstract generation

affaq

 Hello,

I am trying to generate abstract views using abtract generator version 5.10.41_USR5.90.69. I have placed pins on the intersection of M1 and M2 routing grids in layout design but still get warning stating there are no pins on M1-M2 routing grid. If I ignore this waring then I get pins placed at random positions which I dont want.

I have attached abstract log and snapshot of my cell to let you see whats wrong with it.

Thanks in advance!

Affaq

 

abstract.zip
  • Alex Soyer

     Hello,

    How have you generated/displayed the routing ?

    You must bear in mind your cell origin should be on the placement grid and the placement grid starts from 0.0 and the routing grid have an offset from 0.0.

    I hope this help,

    Alex

  • affaq

     I have put cell origin on the placement grid already but the problem exists. You can view the attached snap to check if I took you right.

     

    Affaq

     

  • Alex Soyer

    Hello,

    if I'm not mistaken most of the time the std cells are abutted and half of the power/ground rails overlapped together which means the origin should be at least at half of te rails.

    You must as well bear in mind the spacing between the boundary and the first metal layer is half of the min spacing of metal1.

    On the picture you sent us your  instance seem to be snapped to the routing and not to the placement grid.

    In order to help you to place your pins on the routing you could:

    - move the orign of your cell to be at coordinates x=0.14, y=0.14 (metal offset)

    - set your Xsnap Spacing and Y snap Spacing to 0.28 (metal pitch)

    - then move your pins

     

    I hope this help,

    Alex 

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