I m trying to run LVS with klayout on a simple inverter from open-source-silicon.dev #klayout

I'm trying to run LVS with klayout on a simple inv...

Matthew Guthaus

03/21/2023, 7:12 PM

I'm trying to run LVS with klayout on a simple inverter from the library. I use the run_lvs.py script on this gds and schematic file (.sp), but it doesn't seem to match. The extracted netlist looks correct though! I also tried explicitly naming the well the same thing (VNB) but that didn't fix it either. For some reason nothing matches, not pins, devices, nothing.

foo.lvsdb sky130_fd_sc_hd__inv_1.gds sky130_fd_sc_hd__inv_1.sp extracted.sp

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Matthew Guthaus

03/21/2023, 8:11 PM

ah hah, another sky130 scaling problem. The extracted dimensions were 1e6 off from the spice dimensions.

Tim Edwards

03/21/2023, 9:34 PM

Are you sure? What you posted above had

w=1

from klayout and

w=1e+6u

from magic, which is the same thing (

u=1e-6

multipler in SPICE). (BTW, I recently rewrote magic's netlist output routine to avoid the fixed use of the

multiplier, but the old notation is stuck in the netlists that are in the PDK that were generated by magic.)

Matthew Guthaus

03/21/2023, 9:35 PM

Yeah, I stared at it for a long time. They seemed to match. However, setting the scaling on in the scripts worked.

Matthew Guthaus

03/21/2023, 9:35 PM

I'm wondering if it scaled after parsing the netlists or something...

Matthew Guthaus

03/21/2023, 9:40 PM

If you want to try it, here's the entire setup:

Copy code

cd OpenLane
make mount
klayout -b -r /openlane/pdks/sky130A/libs.tech/klayout/lvs/sky130.lvs -rd input=sky130_fd_sc_hd__inv_1.gds -rd report=sky130_fd_sc_hd__inv_1.lvsdb -rd schematic=sky130_fd_sc_hd__inv_1.sp -rd target_netlist=extracted.sp -rd scale=true

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Matthew Guthaus

03/21/2023, 9:40 PM

(with the two files above)

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