The organization is as follow. Each repository contains cells of one particular size (# of tracks). These are divided into three variants: high-speed, medium-speed, and low-speed. The *`sky130_osu_sc_*T.tlef`* file at the top level is the tech-lef for a particular cell size (defines the placement grid). Within each variant's folder are

doc

,

gds

,

lef

,

lib

,

magic

,

spice

, and

verilog

directories. I thus sought to emulate the folder structure of other PDKs I had worked with.