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Subject: How to identify fractional cells
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evenditti
Moderator
Posts: 23
Online: User is Offline
12/12/2006 3:01 PM  
In Encounter I am getting the following message

Design contains fractional cell.

does anybody knows how to report which cell(s) are having this problems from Encounter?

Thanks,
Eric.
Eric Venditti
Stalker
Posts: 24
Online: User is Offline
12/13/2006 4:46 AM  
Hi Eric,
Fractional cells are cells, who's width or hight is not an integer multiplied by minimum site width or hight defined in the technology LEF (core dimention). For example:
SITE COREHD
CLASS CORE ;
SYMMETRY Y ;
SIZE 0.200 BY 1.800 ;
END COREHD
You can write script, that checks the LEF of your cells, which one of them is not an integer multiplied by the site dimentions, or you can try to add filler cells. When Encounter meet the fractional cell, it will not succed placing minimal filler beside it and you will receive it's coordinate as warning. (never tried this, but I hope it will work)
Regards,
Maxim R.
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Forums > Digital IC > Floorplanning, Place and route > How to identify fractional cells


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