layer logic operation problem:BULK = SIZE DRC:1 BY 1.0

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jordan76

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Hi all,

There are two lines in many DRC/LVS rule files:
//Form Bulk layer
DRC:1 = EXTENT
BULK = SIZE DRC:1 BY 1.0

Could anyone tell me why it has to enlarge BULK 1.0um beyond EXTENT?

regards,
jordan76
 

I think it is to guarantee no false drc errors at the edges of EXTENT introduced.
 

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