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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++ 4k 982

  2. nextpnr nextpnr Public

    nextpnr portable FPGA place and route tool

    C++ 1.5k 268

  3. sby sby Public

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

    Python 467 82

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

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

    Shell 1.2k 98

Repositories

Showing 10 of 41 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 1,151 ISC 98 69 5 Updated Sep 6, 2025
  • yosys Public

    Yosys Open SYnthesis Suite

    YosysHQ/yosys’s past year of commit activity
    C++ 4,010 ISC 982 485 112 Updated Sep 6, 2025
  • nextpnr Public

    nextpnr portable FPGA place and route tool

    YosysHQ/nextpnr’s past year of commit activity
    C++ 1,503 ISC 268 105 (1 issue needs help) 11 Updated Sep 5, 2025
  • prjpeppercorn-test-cases Public

    Project Peppercorn GateMate Test Cases

    YosysHQ/prjpeppercorn-test-cases’s past year of commit activity
    Verilog 10 ISC 6 0 0 Updated Sep 5, 2025
  • prjpeppercorn Public

    Project Peppercorn - GateMate FPGA Bitstream Documentation

    YosysHQ/prjpeppercorn’s past year of commit activity
    Python 24 ISC 3 2 0 Updated Sep 5, 2025
  • apicula Public

    Project Apicula 🐝: bitstream documentation for Gowin FPGAs

    YosysHQ/apicula’s past year of commit activity
    Verilog 584 MIT 77 15 2 Updated Sep 4, 2025
  • scy Public

    Sequence of Covers with Yosys

    YosysHQ/scy’s past year of commit activity
    SystemVerilog 6 1 1 0 Updated Sep 4, 2025
  • mcy Public

    Mutation Cover with Yosys (MCY)

    YosysHQ/mcy’s past year of commit activity
    C++ 86 ISC 14 2 1 Updated Sep 4, 2025
  • eqy Public

    Equivalence checking with Yosys

    YosysHQ/eqy’s past year of commit activity
    C++ 45 7 17 0 Updated Sep 4, 2025
  • sby Public

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

    YosysHQ/sby’s past year of commit activity
    Python 467 82 40 9 Updated Sep 4, 2025

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