By default, VUnit provides bare minimal functionality for running testbenches.
In practice, most users want to use HDL utilities to reduce verbosity and improve reporting when writting tests.
VUnit includes several optional libraries in a group named VHDL builtins (see
run (see Run Library User Guide)
Most of the utilities are based on some internal data types providing dynamic arrays and queues (FIFOs). See Data Types User Guide.
The VUnit communication library (
com) provides a high-level communication mechanism based on the
add_com() and Communication Library User Guide.
The Communication Library depends on the builtins, which are added implicitly.
This library is released as a BETA version. This means non-backwards compatible changes are still likely based on feedback from our users.
The VUnit Verification Component Library (VCL) contains a number of useful Verification Components (VC) as well as a set of utilities for writing your own verification component. Verification components allow a better overview in the test bench by raising the abstraction level of bus transactions. Even if you do not need the advanced features that VCs offer you may still benefit from using peer-verified models of an AXI-bus instead of re-implementing it yourself.
add_verification_components() and Verification Components User Guide.
The VCL depends on both the Communication Library and OSVVM, which are added implicitly.
VUnit provides random integer vector and pointer generation, based on built-in Data Types and OSVVM.
VUnit includes the core of OSVVM as a submodule and internal dependency of optional
libraries such as Random or Verification Components.
However, it can be added explicitly through
Moreover, multiple approaches are supported for using OSVVMLibraries in VUnit. See OSVB: Examples » SISO AXI4 Stream.
VUnit includes JSON-for-VHDL as a submodule. JSON-for-VHDL is an alternative to composite top-level generics, which supports any depth in the content structure.
add_json4vhdl(), json4vhdl.py and example
add_verilog_builtins() and vunit_pkg.sv.