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.

This package provides:

• Prelude library containing datatypes and functions for circuit design

To use the library:

• Import Clash.Prelude

• Alternatively, if you want to explicitly route clock and reset ports, for more straightforward multi-clock designs, you can import the Clash.Explicit.Prelude module. Note that you should not import Clash.Prelude and Clash.Explicit.Prelude at the same time as they have overlapping definitions.

A preliminary version of a tutorial can be found at https://docs.clash-lang.org/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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Flags

Manual Flags

Name	Description	Default
large-tuples	Generate instances for classes such as NFDataX and BitPack for tuples up to and including 62 elements - the GHC imposed maximum. Note that this greatly increases compile times for `clash-prelude`.	Disabled
super-strict	Use deepseqX (instead of seqX) in register-like constructs. This can help to eliminate space leaks when using lazy data structures in registers-like constructs. This potentially slows down Clash hardware simulation.	Disabled
strict-mapsignal	Use seqX in mapSignal#. This can help to eliminate space leaks in long running simulations.	Disabled
doctests	You can disable testing with doctests using `-f-doctests`.	Enabled
unittests	You can disable testing with unittests using `-f-unittests`.	Enabled
benchmarks	You can disable testing with benchmarks using `-f-benchmarks`.	Enabled
workaround-ghc-mmap-crash	Only use this flag when hit by GHC bug #19421. See clash-compiler PR #2444.	Disabled

Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info

Downloads

• clash-prelude-1.10.0.tar.gz [browse] (Cabal source package)
• Package description (revised from the package)

Note: This package has metadata revisions in the cabal description newer than included in the tarball. To unpack the package including the revisions, use 'cabal get'.

Maintainer's Corner

Package maintainers

• ChristiaanBaaij, QBayLogic

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• edit package information

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