You can create mixed language projects by adding both VHDL and Verilog or SystemVerilog support to your project: right click your project and select Configure > Add VHDL support and Configure > Add (System)Verilog support.
In mixed language projects you can navigate from instantiation statements to the matching entity or module. This works for both VHDL entity instantiations in (System)Verilog code and (System)Verilog module instantiations in VHDL code. You can also open the declaration of ports and generics/parameters in mixed instantiations.
Other supported features:
- Find references for entity names, modules, ports, generics and parameters.
- Autocomplete (System)Verilog module instantiations in VHDL code.
- Error reporting of incorrect entity names, modules, ports, generics and parameters in instantiations in VHDL code.
- VHDL renames are refused if they require changes in (System)Verilog code.
Screencast : Mixed languages: instantiating Verilog in VHDL code
If you don’t have the correct license for mixed language projects, you can still create your designs using two separate languages. In this case, choose your main language and enable support for this language (in this example: VHDL). Now, the files in the other language (in this example: Verilog) can still be in your project. You can still edit them and you even get Sigasi Studio support inside any one Verilog file. What is disabled now are the references from and to any Verilog files, but they work within a single Verilog file.
If you want to instantiate a (System)Verilog module in VHDL you need to work with a component declaration so that the VHDL part know the interface of you (System)Verilog module.