Layout21

Custom integrated circuit layout.

• A layered suite of layout-data formats, each expressed in the ProtoBuf schema description language.
• Libraries for compiling from more abstract and terse such expressions into more-detailed.
• Exchange with industry-standard formats such as GDSII and LEF.

Each of the internally-defined layout21 compilers, parsers and generators are implemented in Rust. Cross-language compatibility of the underlying ProtoBuf-based data schema allows for usage in most other popular languages.

Like most large Rust projects layout21 is a multi-crate workspace. Some internal crates are publicly available through crates.io. The "top-level" layout21 crate includes dependencies on all, and is the easiest entry-point for using all layout21 functionality. In layout21's namespace and in documentation most child-crates are referred to by their suffixes, i.e. layout21::raw.

Crate	Description	crates.io	docs.rs
gds21	GDSII Parsing, Generation, and Manipulation
lef21	LEF Parsing, Generation, and Manipulation
layout21protos	Protobuf Schema Definitions
layout21raw	"Raw" geometric layout. Analogous to most existing layout systems.
layout21tetris	Gridded gate-array-style semi-custom layout
layout21	Meta-crate including all of the above