HDL libraries are a very powerful feature of the HDL languages. Sigasi Studio makes it easy to configure and use them. In this chapter, we assume that the basic concepts of HDL libraries are understood. We will explain how they are implemented in Sigasi Studio.

Like with any HDL tool, Sigasi Studio needs to know where the libraries are located on the file system. We will describe how the library configuration can be examined and modified using the GUI.

We will also present some use case about how to set up libraries with Sigasi Studio to organize your projects.

Examining the library configuration

You can examine the library configuration in the Libraries View and in the Project Explorer view. The Libraries view shows how design units are mapped. The Project Explorer view show how VHDL or SystemVerilog files are mapped.

In the Libraries view you can see a tree of all libraries in your projects. You can open each library to see all contained design units.

In the Project Explorer view each physical file or folder is annotated with the library it belongs to, between square brackets:

What you see here is the initial library mapping of a demo project (you can create such a project by selecting File > New > Other > Tutorial VHDL Project or Tutorial SystemVerilog Project).
In the screenshot we see a project called Demo, with a folder named Common Libraries. In that folder, you see the typical standard libraries (std and ieee) upon which all VHDL projects depend. The demo project itself consists of a few VHDL files.

Next to the project’s name Demo, is the annotation work. This means that, barring any overrides, everything in the project will be stored inside the work library.

Lower down, we see overrides. For example, the STD folder has an annotation std. This means that, again barring any further overrides, the entire contents of the STD folder will be mapped into the library std. There are no limits to the number of overrides that can be performed. If this needed, any individual file can be mapped to a separate library.

Modifying the library configuration

The library mapping for project files can be modified in the Libraries and Project Explorer view.

Select a file or a folder in the Project Explorer and right-click.

You get a Set Library context menu, with a number of options:

  • Select Exclude from build to exclude the file or folder from any library
  • Select New Library… to define a new library and map the file or folder to it
  • If one ore more folders are selected, the folder can be added to a library with the folder name(s)
  • Select the name of an existing library to map the file or folder to that library

When you map a file into a library, only that file is affected. However, when you map a folder into a library, then everything in that folder will be mapped into that library. Any overrides in the folder and its sub-folders will be removed. When you are defining the library mapping for a new project you should map from top to bottom.

So in the case of our Demo project, you would change (if work is not a good default) the top folder’s mapping first and then override the mapping in the sub-folders.

When you are changing the library mapping of a project, the project will be rebuilt completely. In order to avoid several consecutive rebuilds while you are setting up your libraries, you can temporarily disable the automatic rebuilds, until you are finished setting up your library mappings. You can do this by disabling the Project > Build Automatically option.

To exclude a file from all libraries, the library mapping context menu provides an Exclude from build option. You can apply that to any file or folder in the project. Sigasi Studio will then assume that the corresponding resource is not a part of the project and will not include that resource in a project build. This is typically useful when you have stale copies of HDL files or folders lying around that you want simply to be ignored.

(System)Verilog include files

(System)Verilog include files are always excluded from the build. Any file that is included in another design file gets excluded from the build, even if it has an extension that would normally identify it as a design file, e.g. .v or .sv. It often doesn’t make sense to compile include files by themselves. Instead, include files are compiled in the context of the file in which they are included.

Configuration file

All library configuration information is stored in the .library_mapping.xml file in the root of your project. If you edit this file, your project will be cleared and rebuilt automatically (a so-called Clean Build).

Sigasi Studio only writes changes to this configuration file when you make changes to the library configuration with the context menu in the Project Explorer. When you do make changes, Sigasi Studio first checks that all paths in the library configuration still exist. If a path no longer exists, is will be removed from the configuration file. Note that the library configuration file is case-sensitive, even on Windows.

Common Libraries

Each VHDL project has a folder called Common Libraries. This is where reusable libraries go: either vendor libraries, third party IP libraries or your own reusable libraries. By default, the STD and IEEE libraries are added to this folder. The Common Libraries folder behaves like any other folder. You can delete it, rename it and apply a different library mapping. In most cases, however, the default configuration is just what you need.

If your project doesn’t have a Common Libraries folder, you can just create it by right-clicking the project in the Project Explorer and selecting the New > Folder dialog.

How to add files to Common Libraries?

In any newly created VHDL project, the Common Libraries folder contains the VHDL files of the IEEE and STD libraries.

To add files to the Common Libraries folder, locate a folder with VHDL files on your file system using the Project Explorer or the file explorer of your OS and drag the folder with VHDL files to the Common Libraries folder.

Alternatively, you can right-click the Common Libraries folder and select the New > Folder dialog where you can use the Advanced » settings to create a Linked Folder pointing to the actual folder location that contains the files you wish to add to the Common Libraries.

How is Common Libraries different from another folder?

  • Common Libraries by default is a virtual folder. This means that it is not a real folder in the project directory and it can only contain references to folders on your file system.

  • Files in Common Libraries are supposed to be error free. Sigasi Studio will not mark errors or warnings in these files.

  • While you work on your project, you don’t want to edit the files in the Common Libraries, but you need them to compile your project.

  • If you activate an external compiler, files in Common Libraries are supposed to be pre-compiled. If you tell Sigasi Studio to compile your project using an external compiler, the Common Libraries are skipped. You need to pre-compile them yourself and let your compiler know where the compiled libraries are. For ModelSim, you can use the “modelsim.ini” file for this. If your project root contains a “modelsim.ini” file, it will be used instead of the default “modelsim.ini” file.

Pre-compile Common Libraries

This section links to various recommendations on to pre-compiling the simulation models of external libraries in the Common Libraries, depending on the external compiler.


Intel (Altera)


The GHDL manual documents precompilation of Vendor Primitives here.

What if I broke my Common Libraries folder?

If you have modified the Common Libraries folder, you can always revert it back to the original state. Right-click on the Common Libraries folder of your project in the explorer view and apply menu-entry Set Library > Reset Common Libraries.

Resetting the library mapping

Sigasi Studio contains two functions to reset all or part of the library mapping.

  • Reset Common Libraries updates the common VHDL libraries to the version (‘93, ‘2002, ‘2008, ‘2019) required by your project. User-defined common libraries remain untouched. To access this function, right-click the Common Libraries folder inside your project in the Project Explorer and select Set Library > Reset Common Libraries.

  • Reset Library Mapping resets the entire library mapping of your project. After resetting the library mapping, Common Libraries are reset as above, and all design files are mapped to library work. Note that this action cannot be undone, so only use it when you want to rebuild the library mapping from scratch. To access this function, right-click your project in the Project Explorer and select Set Library > Reset Library Mapping.

IEEE Vital

See How can I use the IEEE Vital libraries with Sigasi Pro?

Shared libraries

Sigasi Studio allows you to share libraries between multiple projects. The easiest way to do this, is to develop each library in a separate project and configure the Project Dependencies accordingly. To configure the project dependencies, right click the project (the one that uses the shared library) and select Properties. Next click Project References and mark the library project as referenced project.

Using third party libraries

Many projects use third party libraries. These can be added to the project as any other set of VHDL files.

A number of popular third party libraries are the following:

VendorLibraryInstall dir example

On Linux the default installation location for Xilinx is /opt/Xilinx and /opt/altera for Altera.

For many common third party libraries, you can set up the library using a Quick Fix for third party libraries.


XilinxCoreLib is a very big library with more than a thousand entities and architectures. If you include all of these design units, it slows down the compilation phase of Sigasi Studio. In order to avoid that, Sigasi Studio only adds the packages with the component declarations to your project by default. It excludes the entities and architectures from compilation.

You can easily add selected entities (and architectures) to your project by right clicking the corresponding file (filename = entity name.vhd) in the Project Explorer, and selecting Set Library > xilinxcorelib.

Library errors from external compilers

If you are using the External Compilers, the external compiler can also put error markers on library clauses. You can easily verify this by checking the prefix of the error message (e.g. vcom: for vcom errors). Consult the Libraries section of the external compiler integration for more information on configuring libraries for your external compiler.