[general question for sky130] How was sky130 liberty files created?

[SoupBoi1]

Hey, this question is a little unrelated. I would ask this question on the sky130 repo, but it's archived.

How were the golden liberty files for sky130 created? Did they use tools from Cadence, Synopsys, or other open-source software? Did they verify with a fabricated chip?

We have been trying to run the cell at lower voltages than rated and need a way to confirm that our characterization is accurate when it's fabricated.

We need guidance on the best practices and common methods for accurate characterization.

[maliberty]

You would have to ask Skywater. I believe they used closed source tools.