< U016EM8L91B> I know you re black boxing the `chip io` cell open-source-silicon.dev #verification-be

<@U016EM8L91B> I know you're black boxing the `chi...

Mitch Bailey

03/03/2021, 5:12 PM

@User I know you're black boxing the

chip_io

cells, but when I try to extract devices anyways, I get 22.5K

[ERROR]: There are illegal overlaps (e.g., routes over obstructions) in your design.

messages. Do you know what causes these messages.

Ahmed Ghazy

03/03/2021, 5:45 PM

The "feedback" file at

runs/<tag>/logs/magic/magic_ext2spice.feedback.txt

should give you a list of locations where magic is seeing illegal overlaps.

Ahmed Ghazy

03/03/2021, 5:47 PM

if you're using the

mag/

view of the pads or the GDS, this shouldn't happen because there is no sense of obstructions there; otherwise, it might be pointing at the pads and fillers around the IO ring being connected by abutment.

Mitch Bailey

03/03/2021, 5:49 PM

@Ahmed Ghazy Thanks for the hint. I'm viewing the layout (GDS) in klayout. The coordinates are scaled by 5, correct?

Ahmed Ghazy

03/03/2021, 5:50 PM

In microns, you should divide the coordinates by 2000. e.g.,

box 30753 928199 30801 929228

-> (15.376, 464.099) - (15.400, 464.614)

Ahmed Ghazy

03/03/2021, 5:52 PM

(Then you can use the "go-to-location"/CTRL+G thing in KLayout to visit those coordinates)

Mitch Bailey

03/03/2021, 6:00 PM

Thanks! That's what I needed to know. (I thought I tried that and it was the middle of the chip - empty in chip_io. I'll try again.)

Ahmed Ghazy

03/03/2021, 6:17 PM

@Mitch Bailey: Sorry, you need to divide by 200 not 2000...

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