10 years going

10 year anniversary release!

• 10x - 50x faster compile times
• New features:
  • API changes: check the migration guide at the end of Clash.Tutorial
  • All memory elements now have an (implicit) enable line; "Gated" clocks have
    been removed as the clock wasn't actually gated, but implemented as an
    enable line.
  • Circuit domains are now configurable in:

    • (old) The clock period

    • (new) Clock edge on which memory elements latch their inputs
      (rising edge or falling edge)

    • (new) Whether the reset port of a memory element is level sensitive
      (asynchronous reset) or edge sensitive (synchronous reset)

    • (new) Whether the reset port of a memory element is active-high or
      active-low (negated reset)

    • (new) Whether memory element power on in a configurable/defined state
      (common on FPGAs) or in an undefined state (ASICs)

    • See the blog post on this new feature

  • Data types can now be given custom bit-representations: http://hackage.haskell.org/package/clash-prelude/docs/Clash-Annotations-BitRepresentation.html
  • Annotate expressions with attributes that persist in the generated HDL,
    e.g. synthesis directives: http://hackage.haskell.org/package/clash-prelude/docs/Clash-Annotations-SynthesisAttributes.html
  • Control (System)Verilog module instance, and VHDL entity instantiation names
    in generated code: http://hackage.haskell.org/package/clash-prelude/docs/Clash-Magic.html
  • Much improved infrastructure for handling of unknown values: defined spine,
    but unknown leafs: http://hackage.haskell.org/package/clash-prelude/docs/Clash-XException.html#t:NFDataX
  • Experimental: Multiple hidden clocks. Can be enabled by compiling
    clash-prelude with -fmultiple-hidden
  • Experimental: Limited GADT support (pattern matching on vectors, or custom
    GADTs as longs as their usage can be statically removed; no support of
    recursive GADTs)
  • Experimental: Use regular Haskell functions to generate HDL black boxes for
    primitives (in an addition to existing string templates for HDL black boxes)
    See for example: http://hackage.haskell.org/package/clash-lib/docs/Clash-Primitives-Intel-ClockGen.html