rhdl

Ruby Hardware Description Language

This is a Ruby DSL that allows you to describe digital circuitry for an ASIC or FPGA, and compiles it to verilog.

Not finished.

Aspirations:

• fail to compile on undriven wires and registers
• pedantically fail on possible mistakes by default like unused variables
• only allow synthesizable
• simplify 2-block style of verilog
• allow typing variables strongly
• simplify generation of repetitive complex circuits
• be more intuitive
• less room for error
• strongly prevent latches (need to be instatiated on purpose)
• global async reset configuration
• automatic reset implementation
• implicit clock and reset passing by default unless specified
• generate constraints file from top module for certain fpgas
• generate hopfully readable verilog
• formal method primitives
• prevent verilog antipatterns/mistakes
• easy module generation and driving inputs and receiving outputs

Things it cannot do:

• inout
• analog circuits

Example

component "And" do
  input "a"
  input "b"
  output "y"

  comb do
    y <= a & b
  end
end

Add this line to your application's Gemfile:

gem 'rhdl'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install rhdl

TODO: Write usage instructions here

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/davidsiaw/rhdl. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the Rhdl project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.