Hello, I have been following these instructions to get started. http://opencircuitdesign.com/~tim/reference/analog_mixed_signal_flow/analog_design_flow.html I have everything installed and compiled, I’m trying to figure out the canonical directory structure for a project. This command doesn’t work anymore:

ln -s /usr/local/share/pdk/sky130A/libs.tech/xschem/xschemrc

Hi @Colin Weltin-Wu I think /usr/local/share/pdk should link back to where you installed the PDK. Look to see if that's true.

Thanks it was an issue with the open_pdk installer, once I fixed that it worked. I think I figured out the xschem startup sequence, so I can make all my config in my local work dir. Thanks!

@Colin Weltin-Wu I would recommend not to link/copy the PDKs xschemrc file, but to source it from a projects xschemrc file. This is portable and when you change the PDK version, you will automatically use the newest version. See this template for an example project xschemrc under `xschem/`: https://github.com/efabless/sky130_ef_ip__template You need to start xschem in the

xschem/

folder in order for the project xschemrc to be automatically sourced, otherwise you need to specify

--rcfile

manually.

@Colin Weltin-Wu As @Leo Moser wrote above now the correct way to setup the project xschemrc file is to create an empty

xschemrc

file and add one line in it:

source /path/to/pdk/xschemrc

of course you must provide the correct path either by using the shell PDK_ROOT var:

source $env(PDK_ROOT)/sky130A/libs.tech/xschem/xschemrc

or using the absolute path:

source /usr/local/share/pdk/sky130A/libs.tech/xschem/xschemrc

After this

source

line you can add your own customizations of course.

This is exactly what I needed, thank you all! Now my config can be hierarchical.

I'm going to take this as an action item to update the instructions on my website that Colin cited at top. Updated.