https://open-source-silicon.dev
Join Slack
And the fill?
# ieee-sscs-dc-23
g
And the fill?
a
@Tim Edwards @Mitch Bailey @Amro Tork It seems that CMC is not going to add fillers. In Sky130, magic has the capability to add the filler, could we use that on gf180? Maybe I could write something in python, can you give me some advice or paper that explains how to do this?
@Mitch Bailey
m
@aquiles viza @Tim Edwards designed the system, I believe. There is a 
generate_fill
target in 
caravel/Makefile
that is intended to mimic what happens on the platform tapeout. There are scripts and magic tech files involved.
a
a
@aquiles viza Klayout has filling capability but you have to be careful while using it. You will need to clean up the GDS in some areas.
a
I'm playing with the Fill Tool (
Edit -> Utilities -> Fill Tool
). I've still have some questions 1. The filler should cover the entire user space, or just near design cells? 2. The pattern should be a box or it can be any drc valid figure lie a cross? This to control the density. 3. Fill cells might create a very big structure. Could this be a problem? Or should I put a gap between fill cells?
Finally I've got a nice filler script, I was trying to reduce poly error count with 
poly2_dummy
filler but it doesn't make any change on klayout drc. The criteria used: • Avoid shorts with 
comp
, 
poly
and 
contact
layers • Uses a separation of 0.5 um minimum. • Filler cell is a 0.5 width box • No separation between filler cells Any ideas what could be the problem? I will skip this and try on metal1. @Amro Tork @Tim Edwards @Juan Sebastian Moya @Junbeom Park @Akira Tsuchiya @Jorge Marin @mehdi @Mitch Bailey @Gabriel Maranhão
Here is the script only with poly dummy fill generation. It has different parameters.
j
@aquiles viza About the questions, I think 1. filers should cover the entire user space because the purpose of them is to equalize pattern density. 2. It can be any type of shapes unless it harms DRC validation 3. I am not sure, but we don't have to fill it densely because equalizing pattern density doesn't mean fill void spaces densely(but the denser, the more equal) as I think
@aquiles viza About the poly error Could you show the location where poly errors happen?
a
Thanks @Junbeom Park for the feedback • The script allows the user to set where the fill should be done, I'm assuming it will be on the user area so I think it's fine • There's a recommended pattern? Something like a thumb rule? • I remember seen that the density in some cases should be under certain limits, over and under. The script is flexible in terms of the shape to use and the spacing of the pattern
j
@aquiles viza 2. I am new to the concept of filler and don't have any sense of pattern... 3. aha. I didn't know that. Thanks.
27 Views
Open in Slack
PreviousNext
Powered by

What is Linen?

Linen is a search-engine friendly community platform. We offer integrations with existing Slack/Discord communities and make those conversations Google-searchable.

Powered by