Completely open source system on chip design flow including radation hardened standard cells for the open source SkyWater 130nm process.
This is currently a work in progress.
Ryan Ridley and James E. Stine, Jr. james.stine@okstate.edu Oklahoma State University School of Electrical and Computer Engineering VLSI Computer Architecture Research Group
This design flow incorporates all open source tooling which allows anyone to go from layout design, all the way through to place and route. This is only possible due to the many people who have developed and continue to maintain these open source tools. Below is a list of all the tools used in this project, and their respective github repositories:
- skywater-pdk: PDK
- magic: Layout, GDS, and LEF Generation
- xschem: Schematic Generation
- netgen: LVS
- ngspice: SPICE Simulator (This repository hasn't been updated in 8 years. Better to download from their website here
- Liberty Generation: Still working on finding an open source option
- OpenROAD-flow-scripts: Synthesis and PnR
All the tools used in this repository are added as submodules. As of right now, refer to each tools own installation guide. The end goal is to have a Makefile that will build, install, and configure every tool to work with this repository. Since most of the tools use a configuration file to setup paths, everything is still functional if the template configuration files are copied to the right directories.
After installation of the tools has been done independantly, run the following:
git clone --recursive https://github.com/stineje/sky130RHLib.git
cd sky130RHLib
cp .magicrc.template ~/.magicrc
cp .xschemrc.template ~/.xschem/xschemrc
Hopefully I haven't put in any absolute paths. If I have, that's my bad, go ahead and fix that yourself and maybe let me know too. Also hopefully, all the files needed for the SkyWater PDK are present and do not require going to skywater-pdk to retrieve anything. The decision not to make skywater-pdk a submodule and build it along with all the other tools is because it includes several already design standard cell libraries, and the installation is over 15G. All thats really needed from skywater-pdk is the model files for the primitive devices.
This is the current status of this project. Following are the things I'm hoping to add here soon:
- Add more drive strengths for each cell.
- Improve PnR results. Current cell placement is not very good, likely due to improper lef generation of the library.
- Flesh out the Makefile so that it will generate the Liberty file, and get setup to run synthesis and PnR flow.
- Incorporate OpenROAD-Flow-Scripts to replace Synopsys Design Compiler and Calibre Innovus for synthesis and PnR.