Find small triangles

Document created by burr_shaw on Oct 22, 2012
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To find triangles use:

 

VERTEX L1 ==3

Find small triangles:

VARIABLE one_db 1 / $PRECISION
VARIABLE small 0.001

SMALL_L1_triangles {
     Tri = VERTEX L1 ==3
     Se = LENGTH Tri <= small // small edges on a triangle
     Tri WITH EDGE Se
}

 

Alternately if more criteria were needed then the check can be done using DFM PROPERTY:

 

PROP_SMALL_L1_triangles { @ triangle with at least one small edge.
     Tri = VERTEX L1 == 3
     Se = LENGTH Tri <= small
     DFM PROPERTY Tri Se OVERLAP ABUT ALSO
          [ L = MIN(LENGTH(Se)) ] <= small
}

 

Exclude small triangles from XOR results:

VARIABLE one_db 1 / $PRECISION
VARIABLE small 0.001

 

XOR_L1_L2_triangle_filter { @ XOR L1 L2 without small triangles
     A = L1 XOR L2
     Tri = VERTEX A == 3
     Se = LENGTH Tri <= small // small edges on a triangle
     Tri NOT WITH EDGE Se
}

Note that those rules can not be used directly with Fast XOR. They could be used as part of a DRC run to filter the Fast XOR results.

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