Monthly Downloads: 261
Programming language: Haskell
License: BSD 2-clause "Simplified" License
Tags: Hardware     Clash    
Latest version: v1.2.5

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Clash - A functional hardware description language

Pipeline status Hackage Hackage Dependencies Documentation Status

Clash is a functional hardware description language that borrows both its syntax and semantics from the functional programming language Haskell. The Clash compiler transforms these high-level descriptions to low-level synthesizable VHDL, Verilog, or SystemVerilog.

Features of Clash:

  • Strongly typed, but with a very high degree of type inference, enabling both safe and fast prototyping using concise descriptions.

  • Interactive REPL: load your designs in an interpreter and easily test all your component without needing to setup a test bench.

  • Higher-order functions, with type inference, result in designs that are fully parametric by default.

  • Synchronous sequential circuit design based on streams of values, called Signals, lead to natural descriptions of feedback loops.

  • Support for multiple clock domains, with type safe clock domain crossing.


Mailing list: for updates and questions join the mailing list [email protected] or read the forum

Slack: functionalprogramming.slack.com#clash (Invite yourself at fpchat-invite.herokuapp.com).

IRC: libera.chat#clash (webchat access) (or ircs://irc.libera.chat:6697/clash if you want to use a regular IRC client)

Get Clash

Check out clash-lang.org/install to install the latest stable release of Clash, or to setup a Clash project.

Get Clash from source

Get the source code using Git and enter the cloned directory:

git clone [email protected]:clash-lang/clash-compiler.git

# Alternatively, if you haven't setup SSH keys with GitHub:
# git clone https://github.com/clash-lang/clash-compiler.git

cd clash-compiler

To check out a released version, use:

git checkout v1.2.3

To checkout a release branch use:

git checkout 1.2

Note that release branches might contain non-released patches.

GHC compatibility

Linux Windows macOS
8.6 ✔️ ✔️ ✔️
8.8 ✔️ ✔️
8.10 ✔️ ✔️
9.0 ✔️ ✔️ ✔️

† GHC 9.2 contains a regression, rendering Clash error messages indecipherable. This change will be reverted in 9.4.


To use Cabal you need both Cabal and GHC installed on your system. We recommend using ghcup. For more information, see https://www.haskell.org/downloads/.

To run clash use:

cabal v2-run --write-ghc-environment-files=always -- clash

If this fails, make sure you've got an up-to-date package index:

cabal update


Install Stack and run:

stack run -- clash


Or use Nix to get a shell with the clash and clashi binaries on your PATH:


Related libraries and initiatives

  • Clashilator: tooling to integrate Clash with Verilator. Enables fast, multithreaded simulation by compiling Clash designs to C++.
  • Clash Protocols: experimental library for writing Clash circuits with bidirectional communication - such as AXI or Avalon.
  • Clash Starters: starter projects to quickly get you up and running.
  • Clash WaveDrom: generate wave diagrams from Clash using WaveDrom

Projects built with Clash