Elec 422: VLSI Design I

Notes on Layout Density Calculators

MOSIS AMI 0.5u Process

On Owlnet, there are updated density calculators for poly, metal1 and metal2.

They are all in /home/cavallar/bin and include

calc_poly.pl

calc_metal1.pl

calc_metal2.pl

for the standard TinyChip 40 pin package, and

calc_poly_double.pl

calc_metal1_double.pl

calc_metal2_double.pl

for the double-wide 64 pin padframe.

Typical usage is for example:

/home/cavallar/bin/calc_poly.pl flatmag.mag

calculating total polysilicon area...

====================================================

Total PolySilicon Area = 3117472 lambda squared

given 5000 x 5000 area, total poly density = 12.46989 percent

Local polysilicon density = 12.46989 percent

====================================================

Recall that you need to flatten your magic file first

(no cell hierarchy) by making a copy by doing:

1) Goto MAGIC

2) Load up hierarchical MAGIC file

3) :flatten flatmag

4) :load flatmag

5) :save flatmag

*Thanks for Michael Chang for developing these Perl scripts during fall 2002.