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 SITE info for STD cells 

Last post Wed, Feb 20 2013 11:23 AM by IrfanD. 2 replies.
Started by IrfanD 19 Feb 2013 06:01 PM. Topic has 2 replies and 534 views
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  • Tue, Feb 19 2013 6:01 PM

    • IrfanD
    • Not Ranked
    • Joined on Thu, Nov 15 2012
    • Posts 5
    • Points 40
    SITE info for STD cells Reply

    How do we decide, what will be the SIZE of a STD cell SITE.  Here is an example from a library:

     SITE std_site
        SYMMETRY y  ;
        CLASS core  ;
        SIZE 0.20 BY 2.40 ;
    END std_site

    If I browse through all the cells in  library, the smallest cell is of size     "SIZE 0.200 BY 2.40"  Is that the criteria? 

     

     So if I have a library where the smallest STD Cell is 0.8 BY 2.4  then should I be using "SIZE 0.8 BY 2.4" in SITE info. If I do that them  my utlilzation number are not correctly calculated. The placer stops due to high util. 

    Let me know.

    Thanks,

    Irfan

     

     

    • Post Points: 5
  • Wed, Feb 20 2013 11:11 AM

    • IrfanD
    • Not Ranked
    • Joined on Thu, Nov 15 2012
    • Posts 5
    • Points 40
    Re: SITE info for STD cells Reply

    Let me simplify what I am trying to do. I want to change the placement GRID from 0.2 to 0.8 by updating SITE info

    SITE std_site

    SYMMETRY Y ;

    CLASS CORE ;

    SIZE 0.8 BY 2.4 ;

    END std_site But does not seems to work.

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    • Post Points: 5
  • Wed, Feb 20 2013 11:23 AM

    • IrfanD
    • Not Ranked
    • Joined on Thu, Nov 15 2012
    • Posts 5
    • Points 40
    Re: SITE info for STD cells Reply
    Ok just saw a document that says placement grid is based on the lowest metal layer pitch.
    • Post Points: 5
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Started by IrfanD at 19 Feb 2013 06:01 PM. Topic has 2 replies.