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@YosysHQ

Yosys Headquarters

Yosys Open SYnthesis Suite

YosysHQ - Open Source EDA

OSS CAD Suite: the one-stop shop for our tools

If you want to use our EDA tools, the easiest way is to install the binary release OSS CAD suite, which contains all required dependencies and related tools. Find the documentation here. We also have an OSS CAD Suite github action for using the tools in a github CI workflow.

Tabby CAD Suite is a commercial extension of OSS CAD Suite available from YosysHQ GmbH that additionally includes the Verific frontend for industry-grade SystemVerilog and VHDL support, formal verification with SVA, and formal apps.

Our Projects

Front-ends for applications built on top of Yosys:

  • sby: formal property checking
  • mcy: mutation coverage
  • eqy: equivalence checking

Other notable projects:

  • riscv-formal: formally check compliance with the RISC-V specification
  • picorv32: A Size-Optimized RISC-V CPU
  • nerv: A very simple educational RISC-V CPU for demonstrating riscv-formal

Community

Support us

Like what we do? Please consider either buying a license for the Tabby CAD Suite or becoming a sponsor.

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  1. yosys yosys Public

    Yosys Open SYnthesis Suite

    C++ 4.3k 1k

  2. nextpnr nextpnr Public

    nextpnr portable FPGA place and route tool

    C++ 1.6k 288

  3. sby sby Public

    SymbiYosys (sby) -- Front-end for Yosys-based formal verification flows

    Python 494 90

  4. oss-cad-suite-build oss-cad-suite-build Public

    Multi-platform nightly builds of open source digital design and verification tools

    Shell 1.4k 110

Repositories

Showing 10 of 42 repositories
  • oss-cad-suite-build Public

    Multi-platform nightly builds of open source digital design and verification tools

    YosysHQ/oss-cad-suite-build’s past year of commit activity
    Shell 1,369 ISC 110 80 7 Updated Mar 3, 2026
  • yosys Public

    Yosys Open SYnthesis Suite

    YosysHQ/yosys’s past year of commit activity
    C++ 4,309 ISC 1,043 493 96 Updated Mar 3, 2026
  • nextpnr Public

    nextpnr portable FPGA place and route tool

    YosysHQ/nextpnr’s past year of commit activity
    C++ 1,625 ISC 288 110 (1 issue needs help) 12 Updated Mar 2, 2026
  • test-actions Public
    YosysHQ/test-actions’s past year of commit activity
    C++ 0 ISC 1 0 0 Updated Mar 2, 2026
  • apicula Public

    Project Apicula 🐝: bitstream documentation for Gowin FPGAs

    YosysHQ/apicula’s past year of commit activity
    Verilog 640 MIT 85 22 3 Updated Mar 2, 2026
  • abc Public Forked from berkeley-abc/abc

    ABC: System for Sequential Logic Synthesis and Formal Verification

    YosysHQ/abc’s past year of commit activity
    C 32 736 0 2 Updated Feb 27, 2026
  • icestorm Public

    Project IceStorm - Lattice iCE40 FPGAs Bitstream Documentation (Reverse Engineered)

    YosysHQ/icestorm’s past year of commit activity
    Python 1,132 ISC 237 49 20 Updated Feb 26, 2026
  • prjtrellis Public

    Documenting the Lattice ECP5 bit-stream format.

    YosysHQ/prjtrellis’s past year of commit activity
    Python 447 97 37 14 Updated Feb 26, 2026
  • prjpeppercorn Public

    Project Peppercorn - GateMate FPGA Bitstream Documentation

    YosysHQ/prjpeppercorn’s past year of commit activity
    Python 34 ISC 3 0 0 Updated Feb 25, 2026
  • prjpeppercorn-test-cases Public

    Project Peppercorn GateMate Test Cases

    YosysHQ/prjpeppercorn-test-cases’s past year of commit activity
    Verilog 13 ISC 7 0 0 Updated Feb 25, 2026

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