URI modelURI = URI.createFileURI("/test/myFile.xmi");
File folder = new File("/test/");
List<String> arguments = new ArrayList<String>();

Xmi2Vhdlfile generator = new Xmi2Vhdlfile(modelURI, folder, arguments);
generator.doGenerate(new BasicMonitor());

if (!isInWorkspace(VhdlamsPackage.class)) {
                 // The normal package registration if your metamodel is in a plugin.
                 resourceSet.getPackageRegistry().put(VhdlamsPackage.eNS_URI, VhdlamsPackage.eINSTANCE);
             } else {
                 // The package registration that will be used if the metamodel is not deployed in a plugin.
                 // This should be used if your metamodel is in your workspace and if you are using binary resource serialization.
                 resourceSet.getPackageRegistry().put("/myproject/MyVhdlMetamodel.ecore", VhdlamsPackage.eINSTANCE);
            }