Hello. I attempted to perform an LVS check using JKU's vcm_generator. I obtained this file from https://github.com/iic-jku/SKY130_SAR-ADC1. I believe that the '.sch.spice' and '.mag.spice' files are identical because they have passed through the MPW shuttle. However, the result from Netgen indicates 'failed matching.' I suspect this may be due to an error on my part, but I'm unsure how to correct it. Could you please advise me on how to resolve this error? I will attach the files for your reference. Your assistance would be greatly appreciated. Thank you for your help

@권용진학부생 I suspect it’s your

SKY130_setup.tcl

file. You might try using

$PDK_ROOT/$PDK/libs.tech/netgen/$PDK_setup.tcl

. Are they the same?

@Mitch Bailey I try this. But It didn't change anything. I think it doesn't a problem.

What is

$./../../../../

? Can you open

$./../../../../pdks/sky130A/libs.tech/netgen/sky130A_setup.tcl

? I’ve always had problems when

PDK_ROOT

was a relative path and not an absolute path. Can you set

PDK_ROOT

to an absolute path, verify that you can open the file, run netgen and watch the messages. After reading the netlists there should be a line like

Reading setup file $PDK_ROOT/$PDK/libs.tech/netgen/$PDK_setup.tcl

displayed on the screen.

@권용진학부생: I get a unique match running netgen on these two netlists. I only had to change the

.include

line in the schematic-captured netlist to match the location of my installed PDK.

@Mitch Bailey Thank you for your help. I did it to use absolute path. I try to

$/foss/pdk/sky130A/libs.tech/netgen/sky130A_setup.tcl

but it doesn't work. I thought the problem is wrong

PDK_ROOT

. I found new location use

find

. I did LVS using this location, but it has same error.

@권용진학부생 Why do you have a

$

in the setup file name?

$<variable>

is used by the shell to expand variables. If you’re using the full path without variables, you don’t need the

$

. Try

lvs "adc_vcm_generator.sch.spice adc_vcm_generator" "adc_vcm_generator.mag.lvs.spice adc_vcm_generator adc_vcm_generator" /foss/pdks/sky130A/libs.tech/netgen/sky130A_setup.tcl

If

PDK_ROOT=/foss/pdks

and

PDK=sky130A

this is the same as

lvs "adc_vcm_generator.sch.spice adc_vcm_generator" "adc_vcm_generator.mag.lvs.spice adc_vcm_generator adc_vcm_generator" $PDK_ROOT/$PDK/libs.tech/netgen/${PDK}_setup.tcl

(Sorry, in a previous instructions, I used

$PDK_setup.tcl

instead of

${PDK}_setup.tcl

) You can check your environment variables with

echo $PDK_ROOT
echo $PDK

and your setup file with

ls -l $PDK_ROOT/$PDK/libs.tech/netgen/${PDK}_setup.tcl

@Mitch Bailey I felt foolish. Excluding the '$' and entering the path gave me the result. Thank you for your help.

No worries. Glad you could solve the issue.