Some questions about writing DRC rules

Shida

Hi all, I am a postgraduate student, I am trying to write some rules, and I have some questions.

First, I wanna check the width, but I also wanna ensure the width is not affected by some polygons with the wrong angle, What should I do?

This is what I done , What should I add to achieve a more complete width check?

min_aa_w = 500.nm
r_aa_w = aa.width(min_aa_w )
r_aa_w.output("AA_W: AAwidth < 0.5 µm")

I used calibre for DRC inspection before. I also want to know what is the biggest difference between Klayout and Calibre for DRC?

Second，How to write a DRC script when checking the distance between different nets?
The specific requirement is Space between DNW and NW at different nets
I just write like this, but I do not know how to write "different net"

min_DNW__NW_s = 300.nm

r__DNW__NW_s = dnw.separation(nw, min_DNW__NW_s )
r__DNW__NW_s.output("DNW__NW_s: space to nw distance < #{'%.12g' % min_DNW__NW_s } µm")

Thanks in advance!

Best wishes!
Shida

Shida

Ok , i know how to write the rules to check the angle now, but I still confused on different nets problem..

Matthias

@Shida I'm sorry, but KLayout currently can't check distances between different nets. Thats a development branch which is not yet addressed.

Please don't expect you can easily substitute Calibre by KLayout. Mentor doesn't take the money for no reason.

Matthias

Shida

@Matthias
Thank for you reply!
Ok, That makes sense..
Where can I know the difference between Klayout and Calibre? I am very curious.
Maybe the GDS design I made is not so complicated. I compared the two software myself, and I began to think that there was no difference between Klayout and Calibre.
I really respect you very much. I think klayout really helps a lot of people who can't afford calibre to learn!
Best wishes!

Shida

Shida

By the way,
I am trying to check some polygons with 45-degree edge.

min_edge_aa_fourfive = 0.45um
edge_aa_fourfive = aa.with_angle(45.degree)
r_aa_width_fourfive = edge_aa_fourfive.width(min_edge_aa_fourfive )
r_aa_width_fourfive .output("AA_W with 45 degree : AAwidth 45 degree < 0.45 µm")

But it does not work

Thanks in advance!

laurent_c

You can find many DRC examples here :
https://github.com/laurentc2/SKY130_for_KLayout/blob/main/drc/drc_sky130.lydrc
https://github.com/laurentc2/FreePDK45_for_KLayout/blob/master/drc/drc_freepdk45.lydrc

For your 45 degree DRC :

edge_aa_fourfive = aa.with_angle(0 .. 45)
edge_aa_fourfive.output("AA_W with 45 degree : AAwidth 45 degree < 0.45 µm")

or more simple :

aa.with_angle(0 .. 45).output("AA_W with 45 degree : AAwidth 45 degree < 0.45 µm")

Laurent

Shida

Thanks @laurent_c

Shida

Thanks, @laurent_c ， I still confused...
In your code, it selects the 45 degrees, but what I wanna do is to check the width of 45 degrees of aa
how can I do that?

laurent_c

Sorry, here is the way to check it :

min_edge_aa_fourfive = 0.45um
((aa.edges.with_angle(45.degree))+(aa.edges.with_angle(135.degree))).width(min_edge_aa_fourfive).output("AA_W with 45 degree : AAwidth 45 degree < 0.45 µm")

Laurent

Shida

Thanks! @laurent_c
You are so nice! It helps me a lot.

I have already read all the code you upload in github, it is very Conciseness but useful, and I learn a lot!
Wish you have a good day.
BEST WISHES
Shida