Monthly Downloads: 1,052
Programming language: Haskell
License: BSD 2-clause "Simplified" License
Tags: Hardware     Clash    
Latest version: v1.2.1

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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 clash-language+subscribe@googlegroups.com or read the forum

Slack: Invite yourself at fpchat-invite.herokuapp.com. To join #clash, click on "Channels" and search for "clash".

IRC: freenode#clash-lang

Installing Clash

Installing via Snap

Clash is released as a binary package on snapcraft. Snap is supported on all major Linux distributions. Visit Clash’s snapcraft page, scroll down, and choose your distribution for installation instructions. To install the latest stable version, use:

snap install clash

To install the latest development version of Clash, run:

snap install clash --edge

This version is updated every 24 hours.

Installing via Source (Linux / MacOS)

Install the latest nix and run:

curl -s -L https://github.com/clash-lang/clash-compiler/archive/1.2.tar.gz | tar xz
nix-shell clash-compiler-1.2/shell.nix

See the releases page for all available versions of the compiler.

Installing via Source (Windows)

  1. Install GHC Platform. Make sure to install Stack along with it.
  2. Download the source code of Clash 1.2
  3. Unpack the archive
  4. Use cd to navigate to the unpacked directory
  5. Run stack build clash-ghc. This will take a while.

See the releases page for all available versions of the compiler.

Installing via Source (HEAD)

Clone Clash from github using git and enter the cloned directory:

git clone https://github.com/clash-lang/clash-compiler.git
cd clash-compiler

Use one of the build tools below to get Clash up and running.


Install Cabal >= 2.4 and GHC >= 8.4. Even though GHC 8.6 is supported, we currently recommend running 8.4 as the former contains some known bugs concerning documentation generation. If you're using Ubuntu, add HVR's PPA and install them using APT:

sudo add-apt-repository -u ppa:hvr/ghc
sudo apt install ghc-8.4.4 cabal-install-2.4

Add /opt/ghc/bin to your PATH. Finally, run Clash using cabal:

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


You can use Stack to build and run Clash too:

stack run -- clash


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