small flower buds at the head of a piece of broccoli.
Floret is a cell generator designed with advanced nodes in mind. The underlying algorithms are built from the following papers:
- Stauffer, André, and Ravi Nair. "Optimal CMOS cell transistor placement: a relaxation approach." 1988 IEEE International Conference on Computer-Aided Design. IEEE Computer Society, 1988.
- Chen, Howard H., and Ernest S. Kuh. "Glitter: A gridless variable-width channel router." IEEE transactions on computer-aided design of integrated circuits and systems 5.4 (1986): 459-465.
- Deutsch, David N. "A “Dogleg” channel router." Papers on Twenty-five years of electronic design automation. 1988. 111-119.
Install all dependencies
sudo apt install libqhull-dev zlib1g-dev python3.10-dev
git submodule update --init --recursive
There are two build systems supported. Tup is preferred, placing floret-linux into the build-linux directory
tup init
tup
However, we also a Makefile set up, placing floret-linux into the root directory
make
See Releases for example generated layouts.
This will generate a GDS library with a nand gate in test.gds called test using the sky130 tech file provided in the tech directory.
build-linux/floret-linux --gds test test.gds tech/sky130.py test/nand.spi
This will generate directory called cells and create a .rect file with a nand gate layout using the ACT layout.conf and prs2net.conf files in the specified directory.
build-linux/floret-linux --rect cells /opt/cad/conf/sky130 "tech/actconf.py /opt/cad/conf/sky130" test/nand.spi
Floret is being tested on Skywater's 130nm process technology node. It is not yet producing DRC clean layouts, but the layouts are often workable with minor manual alterations.