XNOR or NXOR option in klayout

r_user_ant

The XOR works well in klayout, is there a way to run a XNOR/NXOR operation within klayout? Basically the aim would be to keep only polygons that don't have overlap.

Thanks,

Matthias

I'm afraid, I don't understand ... that is exactly what XOR does: it leaves the parts of polygons which do not overlap.

Do you mean the inverse of XOR that is not available?

Background is that all boolean operations produce local results - they will not generate output outside the drawing area - that would create a logical dilemma as this area is not bounded.

So in the truth table, the row with A=0 and B=0 will always produce "0". Hence all available operations are these:

   A  B   | ZERO | BNOTA | ANOTB | XOR  | AND  | =B   | =A   | OR   |
---------------------------------------------------------------------
   0  0   | 0    | 0     | 0     | 0    | 0    | 0    | 0    | 0    |
   0  1   | 0    | 1     | 0     | 1    | 0    | 1    | 0    | 1    |
   1  0   | 0    | 0     | 1     | 1    | 0    | 0    | 1    | 1    |
   1  1   | 0    | 0     | 0     | 0    | 1    | 1    | 1    | 1    |

Apart from the trivial ZERO, "=A" and "=B", all operations are supported in DRC.

If you need "inversion" you can basically subtract ("NOT") from a huge rectangle, but technically you should avoid that as it will generate huge polygons with many holes.

Matthias

dai

Hi @Matthias ,
I used strmxor.exe to compare to input GDS(command: strmxor.exe input1.gds input2.gds output.gds), I got output GDS that contains what is different between them. If do we have any way to write to output what is same between them?

Thank you,
dai

dai

Never mind, @Matthias.
I found the way : A xor B = C and then ( A + B ) xor C = D. D will be contains what is same between A and B

Thank you,
dai

Matthias

Hi @dai,

I think this is just a complicated way to do an AND

strmxor can't do AND right now. Maybe I should include that too. But a more general way is to run a DRC script for that purpose.

Matthias

dai

Thank you for your suggestion , @Matthias.
I will follow that way.

dai