How to create and modify layout instances with SKILL

Hello,

I am trying to automate some things in my IC layout and now I need to
import layout cells from a library and modify their parameters using
SKILL. I am just starting with SKILL, so I will appreciate a lot if
some one can help me, in particular with a piece of code as example.

So far, I was able to create a new layout cell view and import the
cells that I want to use. I used the following code to import two NMOS
transistors in my new cell view:

cv = dbOpenCellViewByType("test" "alfa" "layout" "maskLayout" "w")

instance1 = dbOpenCellViewByType("tsmc18rf" "nmos2v" "layout"
"maskLayout" "r")
cd1 = dbCreateInst(cv instance1 "M1" list(100 50) "R0")

instance2 = dbOpenCellViewByType("tsmc18rf" "rfnmos2v" "layout"
"maskLayout" "r")
cd2 = dbCreateInst(cv instance2 "M2" list(100 100) "R0")

instance1 has parameters: l,w,total_width, Number of Fingers
instance 2 has parameters: Width_per_Finger, Length_per_Finger,
Number_of_Fingers, Create_Dummny_Poly, Create_Guard_Ring.

I would want to modify each of this parameters for these instances
using SKILL code. Any ideas?
Thanks!

 

I solved my problem. If anyone faces the same issue, this is my
solution.

Create a clan layout cell, and insert the instance that you are
interested in automating. Then select Tools->Pcell, a new menu called
'Pcell' will be avaliable. Then just open Pcell->Compile->To Skill
File...

Then you have all the skill code that is needed to create the instance
including the initialization parameters. It could have be taken a lot
of time to arrive to that code myself. Hope it is usefull to others.

Saul

 

Thanks for post.

 

Do watch out a bit though. The code you get from the graphical pcell editor is
not that optimal, and not necessarily a good example to base well written SKILL
code from. It's a useful source of hints though, I guess.

You might want to attend a SKILL class though - all of this is covered there.

Regards,

Andrew.