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

Features of CλaSH:

• Strongly typed (like VHDL), yet with a very high degree of type inference, enabling both safe and fast prototying using consise descriptions (like Verilog).

• 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.

This package provides:

• Prelude library containing datatypes and functions for circuit design

To use the library:

• Import CLaSH.Prelude

• Additionally import CLaSH.Prelude.Explicit if you want to design explicitly clocked circuits in a multi-clock setting

A preliminary version of a tutorial can be found in CLaSH.Tutorial, for a general overview of the library you should however check out CLaSH.Prelude. Some circuit examples can be found in CLaSH.Examples.

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