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:
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Strongly typed, but with a very high degree of type inference, enabling both safe and fast prototyping using concise descriptions. 
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Interactive REPL: load your designs in an interpreter and easily test all your component without needing to setup a test bench. 
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Higher-order functions, with type inference, result in designs that are fully parametric by default. 
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Synchronous sequential circuit design based on streams of values, called Signals, lead to natural descriptions of feedback loops.
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Support for multiple clock domains, with type safe clock domain crossing. 
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