xschem_sky130

XSCHEM symbol libraries for the Google-Skywater 130nm process design kit.

If you use open_pdks it will install also the xschem libraries, so you don't need to clone this repository directly.

A step by step video shows how to boostrap a working environment for xschem + open_pdks + ngspice, that is, compile and install xschem, install the open_pdks files, and finally build the pre-master development branch of ngspice. For ngspice building refer to this old video, but follow only the instructions for ngspice, as the rest is superseeded by the xschem + open_pdks video.

Open_Pdks UPDATE

instead of manually installing skywater-pdk as explained in the video, follow the open_pdks install as shown here. This will (among other things) install all the spice models. Current xschem_sky130 examples now use the model file locations as installed by open_pdks

This repository contains:

• sky130_fd_pr Xschem SKY130 component library
• stdcells Xschem process agnostic digital standard cell library draft
• sky130_stdcells Xschem digital standard cell library specifically targeted to the Skywater sky130_fd_sc_hd digital gate library
• mips_cpu Xschem port of Diadatp mips_cpu verilog project
• sky130_tests Xschem testbenches for testing sky130_fd_pr components with NGSPICE
• sky130_fd_pr.patch Patch file (apply in sky130_fd_pr directory) to move ‘nf’ parameter before ‘AD’,‘AS’,‘PD’,‘PS’ that might contain equations that depend on ‘nf’. Ngspice considers ‘nf’ as undefined if not found before the equations. This patch is not needed if models are installed via open_pdks.
• decred_hash_macro Import of a big RTL design from spice netlist.
• xschemrc Xschem configuration file.

Run xschem from this directory. It will read the xschemrc file to correctly set the search paths.

Stefan