If you want to add other Veryl projects to dependencies of your project, you can add them to [dependencies] section in Veryl.toml. The left hand side of entry is path to the dependency, and the right hand side is version.

"" = "0.1.0"

By default, the namespace of the dependency is the same as the project name of the dependency. If you want to specify namespace, you can use name field.

"" = {version = "0.1.0", name = "veryl_sample_alt"}

If you want to use many versions of the same dependency path, you can specify each name.

"" = [
    {version = "0.1.0", name = "veryl_sample1"},
    {version = "0.2.0", name = "veryl_sample2"},

Usage of dependency

After adding dependencies to Veryl.toml, you can use moudle, interface and package in the dependencies. The following example uses delay module in the veryl_sample dependency.

module ModuleA (
    i_clk: input  clock,
    i_rst: input  reset,
    i_d  : input  logic,
    o_d  : output logic,
) {
    inst u_delay: veryl_sample::delay (
        i_d  ,
        o_d  ,

Note: The result of play button in the above code is not exact because it doesn’t use dependency resolution. Actually the module name becomes veryl_samlle_delay

Version Requirement

The version field of [dependencies] section shows version requirement. For example, version = "0.1.0" means the latest version which has compatibility with 0.1.0. The compatibility is judged by Semantic Versioning. A version is constructed from the following three parts.

  • MAJOR version when you make incompatible API changes
  • MINOR version when you add functionality in a backwards compatible manner
  • PATCH version when you make backwards compatible bug fixes

If MAJOR version is 0, MINOR is interpreted as incompatible changes.

If there are 0.1.0 and 0.1.1 and 0.2.0, 0.1.1 will be selected. This is because

  • 0.1.0 is compatible with 0.1.0.
  • 0.1.1 is compatible with 0.1.0.
  • 0.2.0 is not compatible with 0.1.0.
  • 0.1.1 is the latest in the compatible versions.

The version field allows other version requirement reprensentation like =0.1.0. Please see version requirement of Rust for detailed information: Specifying Dependencies.