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SITE info for STD cells

IrfanD over 12 years ago

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

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IrfanD over 12 years ago

Ok just saw a document that says placement grid is based on the lowest metal layer pitch.
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IrfanD over 12 years ago

Ok just saw a document that says placement grid is based on the lowest metal layer pitch.
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