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