Вот примерчик...
DEVICE MN(N18) ngate18 poly(G) nsd(S) nsd(D) pwell(B) <ndif>
[ PROPERTY W,L,AD,AS,PD,PS
W = PERIM_CO(ngate18,nsd)/2
L = AREA(ngate18)/W
AD = AREA(D)*W/perimeter_inside(D,ndif)
AS = AREA(S)*W/perimeter_inside(S,ndif)
PD = perimeter(D)*W/perimeter_inside(D,ndif)
PS = perimeter(S)*W/perimeter_inside(S,ndif)
]