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Floret

small flower buds at the head of a piece of broccoli.

Floret is an automated custom cell generator. The underlying algorithms are built from the following papers:

  1. 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.
  2. 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.
  3. Deutsch, David N. "A “Dogleg” channel router." Papers on Twenty-five years of electronic design automation. 1988. 111-119.

Build and Install

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

Examples

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

cell

Status

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.