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we noticed the following problem with magic 6.5 -- can anybody verify
it as present or absent on their magic version ?  the problem is that
when 2 parallel metal wires have a long stretch of common (sidewall)
capacitance, but a very small stretch of slightly closer spacing in
common, then the entire sidewall capacitance extracted represents only
that of the smaller stretch.

here are the .mag and .ext files for 2 cases, the first with no small
stretch, and the 2nd with a small stretch.  i used techfile
2000d/SCN3M_SUBM.30, but i don't think the techfile version matters.

thanks,
/jeff

m2s.mag:              <<<< with single large common sidewall area >>>>

magic
tech scmos
timestamp 965753121
<< pwell >>
rect -93 -115 9430 157
<< metal2 >>
rect 0 10 9384 13
rect 0 0 9384 3
<< labels >>
rlabel pwell -92 -114 -92 -114 2 pw
rlabel metal2 1 1 1 1 1 m2a
rlabel metal2 1 11 1 11 1 m2b
<< end >>

m2s.ext:

timestamp 965753121
version 5.1
tech scmos
style HP0.5um(hpcmos14tb)from:T02Y
scale 1000 1 30
resistclasses 3000 2400 728000 728000 1 2500 2500 70 70 50
node "m2a" 219 1.40261e-11 0 0 m2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 28152 18774 0 0
node "m2b" 219 1.40261e-11 0 10 m2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 28152 18774 0 0
node "pw" 0 0 -93 -115 pw 0 0 0 0 0 0 0 0 2590256 19590 0 0 0 0 0 0 0 0 0 0
cap "pw" "m2a" 81766.6
cap "pw" "m2b" 81766.6
cap "m2b" "m2a" 68302.1   <<<<<<<<<<<<<<<<<<<<<< big sidewall capacitance

m2s2.mag:               <<<< with small stetch of common sidewall area >>>>

magic
tech scmos
timestamp 965753225
<< pwell >>
rect -93 -115 9430 157
<< metal2 >>
rect 0 10 9384 13
rect 3 9 6 10
rect 0 0 9384 3
<< labels >>
rlabel pwell -92 -114 -92 -114 2 pw
rlabel metal2 1 1 1 1 1 m2a
rlabel metal2 1 11 1 11 1 m2b
<< end >>

m2s2.ext:

timestamp 965753225
version 5.1
tech scmos
style HP0.5um(hpcmos14tb)from:T02Y
scale 1000 1 30
resistclasses 3000 2400 728000 728000 1 2500 2500 70 70 50
node "m2a" 219 1.40261e-11 0 0 m2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 28152 18774 0 0
node "m2b" 219 1.35882e-11 0 10 m2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 28155 18776 0 0
node "pw" 0 0 -93 -115 pw 0 0 0 0 0 0 0 0 2590256 19590 0 0 0 0 0 0 0 0 0 0
cap "pw" "m2a" 81766.6
cap "pw" "m2b" 81775.3
cap "m2b" "m2a" 25.475    <<<<<<<<<<<<<<<<<<<<<< small sidewall capacitance

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