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XOR Vs NOT in layout comparison

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skthebatman

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EDA tools use XOR to compare two layouts. There is also an option to use Not i.e two Not operations and combining the result. I came to know that while Xor operation is fast, it can give you false results. Can any one give an example where Xor fails but two not operations work?
 

I think you are referring to how XOR behaves if the layout has overlapping shapes. The not operation works on the 'lack of layout shapes', and for this reason does not care for overlaps.
 

Can you give me an example?
I am trying to reproduce this in an actual run.


Thanks in advance
 

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