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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.

Pinned Loading

  1. yosys yosys Public

    Yosys Open SYnthesis Suite

    C++ 3.7k 928

  2. nextpnr nextpnr Public

    nextpnr portable FPGA place and route tool

    C++ 1.4k 251

  3. sby sby Public

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

    Python 440 80

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

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

    Shell 1k 90

Repositories

Showing 10 of 41 repositories
  • prjpeppercorn-test-cases Public

    Project Peppercorn GateMate Test Cases

    YosysHQ/prjpeppercorn-test-cases’s past year of commit activity
    Verilog 7 ISC 1 0 0 Updated Apr 9, 2025
  • yosys Public

    Yosys Open SYnthesis Suite

    YosysHQ/yosys’s past year of commit activity
    C++ 3,742 ISC 928 474 124 Updated Apr 9, 2025
  • nextpnr Public

    nextpnr portable FPGA place and route tool

    YosysHQ/nextpnr’s past year of commit activity
    C++ 1,415 ISC 251 105 (1 issue needs help) 9 Updated Apr 9, 2025
  • mcy Public

    Mutation Cover with Yosys (MCY)

    YosysHQ/mcy’s past year of commit activity
    C++ 80 ISC 9 2 0 Updated Apr 9, 2025
  • eqy Public

    Equivalence checking with Yosys

    YosysHQ/eqy’s past year of commit activity
    Python 41 7 12 0 Updated Apr 9, 2025
  • sby Public

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

    YosysHQ/sby’s past year of commit activity
    Python 440 80 38 11 Updated Apr 9, 2025
  • 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 27 624 0 2 Updated Apr 9, 2025
  • 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 1,013 ISC 90 55 3 Updated Apr 9, 2025
  • prjtrellis Public

    Documenting the Lattice ECP5 bit-stream format.

    YosysHQ/prjtrellis’s past year of commit activity
    Python 411 88 33 13 Updated Apr 8, 2025
  • rtlil-mlir Public

    Yosys RTLIL dialect for MLIR

    YosysHQ/rtlil-mlir’s past year of commit activity
    C++ 1 ISC 0 0 0 Updated Apr 4, 2025

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