VHDL/Verilog support is mentioned in the documentation

src/main/java/de/neemann/digital/core/arithmetic/Add.java

@@ -27,7 +27,8 @@ public class Add extends Node implements Element, Countable {
             = new ElementTypeDescription(Add.class, input("a"), input("b"), input("c_i"))
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.LABEL)
-            .addAttribute(Keys.BITS);
+            .addAttribute(Keys.BITS)
+            .supportsHDL();
 
     private final int bits;
     private final ObservableValue sum;

src/main/java/de/neemann/digital/core/arithmetic/BitExtender.java

@@ -28,7 +28,8 @@ public class BitExtender implements Element {
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.LABEL)
             .addAttribute(Keys.INPUT_BITS)
-            .addAttribute(Keys.OUTPUT_BITS);
+            .addAttribute(Keys.OUTPUT_BITS)
+            .supportsHDL();
 
     private final ObservableValue out;
     private final int outBits;

src/main/java/de/neemann/digital/core/arithmetic/Comparator.java

@@ -31,7 +31,8 @@ public class Comparator extends Node implements Element, Countable {
                     .addAttribute(Keys.LABEL)
                     .addAttribute(Keys.BITS)
                     .addAttribute(Keys.SIGNED)
-                    .setShortName("");
+                    .setShortName("")
+                    .supportsHDL();
 
     private final int bits;
     private final Boolean signed;

src/main/java/de/neemann/digital/core/arithmetic/Mul.java

@@ -28,7 +28,8 @@ public class Mul extends Node implements Element, Countable {
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.LABEL)
             .addAttribute(Keys.SIGNED)
-            .addAttribute(Keys.BITS);
+            .addAttribute(Keys.BITS)
+            .supportsHDL();
 
     private final ObservableValue mul;
     private final int bits;

src/main/java/de/neemann/digital/core/arithmetic/Neg.java

@@ -27,7 +27,8 @@ public class Neg extends Node implements Element, Countable {
      */
     public static final ElementTypeDescription DESCRIPTION = new ElementTypeDescription(Neg.class, input("in"))
             .addAttribute(Keys.ROTATE)
-            .addAttribute(Keys.BITS);
+            .addAttribute(Keys.BITS)
+            .supportsHDL();
 
     private final ObservableValue output;
     private final int bits;

src/main/java/de/neemann/digital/core/arithmetic/Sub.java

@@ -23,7 +23,8 @@ public class Sub extends Add {
             = new ElementTypeDescription(Sub.class, input("a"), input("b"), input("c_i"))
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.LABEL)
-            .addAttribute(Keys.BITS);
+            .addAttribute(Keys.BITS)
+            .supportsHDL();
 
     /**
      * Creates a new instance

src/main/java/de/neemann/digital/core/basic/FanIn.java

@@ -84,6 +84,7 @@ public abstract class FanIn extends Node implements Element, Countable {
         FanInDescription(Class<? extends Element> clazz) {
             super(clazz);
             addAttributes();
+            supportsHDL();
         }
 
         private void addAttributes() {

src/main/java/de/neemann/digital/core/basic/Not.java

@@ -28,7 +28,8 @@ public class Not extends Node implements Element, Countable {
     public static final ElementTypeDescription DESCRIPTION = new ElementTypeDescription(Not.class, input("in"))
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.WIDE_SHAPE)
-            .addAttribute(Keys.BITS);
+            .addAttribute(Keys.BITS)
+            .supportsHDL();
 
     private final ObservableValue output;
     private final int bits;

src/main/java/de/neemann/digital/core/element/ElementTypeDescription.java

@@ -26,6 +26,7 @@ public class ElementTypeDescription {
     private ElementFactory elementFactory;
     private final PinDescriptions inputPins;
     private final ArrayList<Key> attributeList;
+    private boolean supportsHDL;
 
     /**
      * Creates a new ElementTypeDescription
@@ -136,10 +137,11 @@ public class ElementTypeDescription {
     public String getDescription(ElementAttributes elementAttributes) {
         String d = Lang.getNull(langKey + "_tt");
         if (d == null) {
-            return getTranslatedName();
-        } else {
-            return d;
+            d = getTranslatedName();
         }
+        if (supportsHDL)
+            d += " " + Lang.get("msg_supportsHDL");
+        return d;
     }
 
     /**
@@ -156,6 +158,23 @@ public class ElementTypeDescription {
         return this;
     }
 
+    /**
+     * Used to flag this elements as supporting hdl export
+     *
+     * @return this for chained calls
+     */
+    public ElementTypeDescription supportsHDL() {
+        supportsHDL = true;
+        return this;
+    }
+
+    /**
+     * @return true if the element supports export to HDL.
+     */
+    public boolean isSupportsHDL() {
+        return supportsHDL;
+    }
+
     /**
      * Returns the list of attributes which are used by this element.
      *

src/main/java/de/neemann/digital/core/extern/External.java

@@ -40,7 +40,8 @@ public class External extends Node implements Element {
             .addAttribute(Keys.EXTERNAL_OUTPUTS)
             .addAttribute(Keys.EXTERNAL_CODE)
             .addAttribute(Keys.APPLICATION_TYPE)
-            .addAttribute(Keys.GHDL_OPTIONS);
+            .addAttribute(Keys.GHDL_OPTIONS)
+            .supportsHDL();
 
     private final Application.Type type;
     private final PortDefinition ins;

src/main/java/de/neemann/digital/core/flipflops/FlipflopD.java

@@ -31,7 +31,8 @@ public class FlipflopD extends Node implements Element, Countable {
             .addAttribute(Keys.LABEL)
             .addAttribute(Keys.DEFAULT)
             .addAttribute(Keys.INVERTER_CONFIG)
-            .addAttribute(Keys.VALUE_IS_PROBE);
+            .addAttribute(Keys.VALUE_IS_PROBE)
+            .supportsHDL();
 
     private final int bits;
     private final boolean isProbe;

src/main/java/de/neemann/digital/core/flipflops/FlipflopDAsync.java

@@ -33,7 +33,8 @@ public class FlipflopDAsync extends FlipflopD {
             .addAttribute(Keys.LABEL)
             .addAttribute(Keys.DEFAULT)
             .addAttribute(Keys.INVERTER_CONFIG)
-            .addAttribute(Keys.VALUE_IS_PROBE);
+            .addAttribute(Keys.VALUE_IS_PROBE)
+            .supportsHDL();
 
     private ObservableValue setVal;
     private ObservableValue clrVal;

src/main/java/de/neemann/digital/core/flipflops/FlipflopJK.java

@@ -30,7 +30,8 @@ public class FlipflopJK extends FlipflopBit {
             .addAttribute(Keys.LABEL)
             .addAttribute(Keys.DEFAULT)
             .addAttribute(Keys.INVERTER_CONFIG)
-            .addAttribute(Keys.VALUE_IS_PROBE);
+            .addAttribute(Keys.VALUE_IS_PROBE)
+            .supportsHDL();
 
     private ObservableValue jVal;
     private ObservableValue kVal;

src/main/java/de/neemann/digital/core/flipflops/FlipflopJKAsync.java

@@ -36,7 +36,8 @@ public class FlipflopJKAsync extends FlipflopJK {
             .addAttribute(Keys.LABEL)
             .addAttribute(Keys.DEFAULT)
             .addAttribute(Keys.INVERTER_CONFIG)
-            .addAttribute(Keys.VALUE_IS_PROBE);
+            .addAttribute(Keys.VALUE_IS_PROBE)
+            .supportsHDL();
 
     private ObservableValue setVal;
     private ObservableValue clrVal;

src/main/java/de/neemann/digital/core/io/Const.java

@@ -27,7 +27,8 @@ public class Const implements Element {
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.BITS)
             .addAttribute(Keys.VALUE)
-            .addAttribute(Keys.INT_FORMAT);
+            .addAttribute(Keys.INT_FORMAT)
+            .supportsHDL();
 
     private final ObservableValue output;
 

src/main/java/de/neemann/digital/core/io/Ground.java

@@ -26,7 +26,8 @@ public class Ground implements Element {
     public static final ElementTypeDescription DESCRIPTION = new ElementTypeDescription(Ground.class)
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.BITS)
-            .addAttribute(Keys.LABEL);
+            .addAttribute(Keys.LABEL)
+            .supportsHDL();
 
     private final ObservableValue output;
 

src/main/java/de/neemann/digital/core/io/In.java

@@ -39,7 +39,8 @@ public class In implements Element {
             .addAttribute(Keys.DESCRIPTION)
             .addAttribute(Keys.INT_FORMAT)
             .addAttribute(Keys.PINNUMBER)
-            .addAttribute(Keys.ADD_VALUE_TO_GRAPH);
+            .addAttribute(Keys.ADD_VALUE_TO_GRAPH)
+            .supportsHDL();
 
     private final ObservableValue output;
     private final String label;

src/main/java/de/neemann/digital/core/io/Out.java

@@ -36,7 +36,8 @@ public class Out implements Element {
             .addAttribute(Keys.DESCRIPTION)
             .addAttribute(Keys.INT_FORMAT)
             .addAttribute(Keys.PINNUMBER)
-            .addAttribute(Keys.ADD_VALUE_TO_GRAPH);
+            .addAttribute(Keys.ADD_VALUE_TO_GRAPH)
+            .supportsHDL();
 
     /**
      * The LED description

src/main/java/de/neemann/digital/core/io/PinControl.java

@@ -27,7 +27,8 @@ public class PinControl extends Node implements Element {
     public static final ElementTypeDescription DESCRIPTION = new ElementTypeDescription(PinControl.class, input("wr"), input("oe"))
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.BITS)
-            .addAttribute(Keys.MIRROR);
+            .addAttribute(Keys.MIRROR)
+            .supportsHDL();
 
     private final int bits;
     private final ObservableValue rdValue;

src/main/java/de/neemann/digital/core/io/VDD.java

@@ -26,7 +26,8 @@ public class VDD implements Element {
     public static final ElementTypeDescription DESCRIPTION = new ElementTypeDescription(VDD.class)
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.BITS)
-            .addAttribute(Keys.LABEL);
+            .addAttribute(Keys.LABEL)
+            .supportsHDL();
 
     private final ObservableValue output;
 

src/main/java/de/neemann/digital/core/memory/BlockRAMDualPort.java

@@ -33,7 +33,8 @@ public class BlockRAMDualPort extends Node implements Element, RAMInterface {
             .addAttribute(Keys.BITS)
             .addAttribute(Keys.ADDR_BITS)
             .addAttribute(Keys.IS_PROGRAM_MEMORY)
-            .addAttribute(Keys.LABEL);
+            .addAttribute(Keys.LABEL)
+            .supportsHDL();
 
     private DataField memory;
     private final ObservableValue output;

src/main/java/de/neemann/digital/core/memory/Counter.java

@@ -26,7 +26,8 @@ public class Counter extends Node implements Element, ProgramCounter {
             .addAttribute(Keys.INVERTER_CONFIG)
             .addAttribute(Keys.LABEL)
             .addAttribute(Keys.VALUE_IS_PROBE)
-            .addAttribute(Keys.IS_PROGRAM_COUNTER);
+            .addAttribute(Keys.IS_PROGRAM_COUNTER)
+            .supportsHDL();
 
     private final ObservableValue out;
     private final ObservableValue ovf;

src/main/java/de/neemann/digital/core/memory/CounterPreset.java

@@ -36,7 +36,8 @@ public class CounterPreset extends Node implements Element, ProgramCounter {
             .addAttribute(Keys.INVERTER_CONFIG)
             .addAttribute(Keys.LABEL)
             .addAttribute(Keys.VALUE_IS_PROBE)
-            .addAttribute(Keys.IS_PROGRAM_COUNTER);
+            .addAttribute(Keys.IS_PROGRAM_COUNTER)
+            .supportsHDL();
 
     private final ObservableValue out;
     private final ObservableValue ovf;

src/main/java/de/neemann/digital/core/memory/LookUpTable.java

@@ -36,7 +36,8 @@ public class LookUpTable extends Node implements Element {
             .addAttribute(Keys.BITS)
             .addAttribute(Keys.INPUT_COUNT)
             .addAttribute(Keys.LABEL)
-            .addAttribute(Keys.DATA);
+            .addAttribute(Keys.DATA)
+            .supportsHDL();
 
     private final DataField data;
     private final ObservableValue output;

src/main/java/de/neemann/digital/core/memory/RAMDualAccess.java

@@ -33,7 +33,8 @@ public class RAMDualAccess extends Node implements Element, RAMInterface {
             .addAttribute(Keys.BITS)
             .addAttribute(Keys.ADDR_BITS)
             .addAttribute(Keys.IS_PROGRAM_MEMORY)
-            .addAttribute(Keys.LABEL);
+            .addAttribute(Keys.LABEL)
+            .supportsHDL();
 
     private final DataField memory;
     private final ObservableValue out1;

src/main/java/de/neemann/digital/core/memory/RAMDualPort.java

@@ -32,7 +32,8 @@ public class RAMDualPort extends Node implements Element, RAMInterface {
             .addAttribute(Keys.ADDR_BITS)
             .addAttribute(Keys.INT_FORMAT)
             .addAttribute(Keys.IS_PROGRAM_MEMORY)
-            .addAttribute(Keys.LABEL);
+            .addAttribute(Keys.LABEL)
+            .supportsHDL();
 
     private DataField memory;
     private final IntFormat intFormat;

src/main/java/de/neemann/digital/core/memory/ROM.java

@@ -41,7 +41,8 @@ public class ROM extends Node implements Element, ROMInterface, ProgramMemory {
             .addAttribute(Keys.DATA)
             .addAttribute(Keys.INT_FORMAT)
             .addAttribute(Keys.IS_PROGRAM_MEMORY)
-            .addAttribute(Keys.AUTO_RELOAD_ROM);
+            .addAttribute(Keys.AUTO_RELOAD_ROM)
+            .supportsHDL();
 
     private DataField data;
     private final IntFormat intFormat;

src/main/java/de/neemann/digital/core/memory/Register.java

@@ -29,7 +29,8 @@ public class Register extends Node implements Element, Countable, ProgramCounter
             .addAttribute(Keys.LABEL)
             .addAttribute(Keys.INVERTER_CONFIG)
             .addAttribute(Keys.IS_PROGRAM_COUNTER)
-            .addAttribute(Keys.VALUE_IS_PROBE);
+            .addAttribute(Keys.VALUE_IS_PROBE)
+            .supportsHDL();
 
     private final int bits;
     private final boolean isProbe;

src/main/java/de/neemann/digital/core/memory/RegisterFile.java

@@ -34,7 +34,8 @@ public class RegisterFile extends Node implements Element, RAMInterface {
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.BITS)
             .addAttribute(Keys.ADDR_BITS)
-            .addAttribute(Keys.LABEL);
+            .addAttribute(Keys.LABEL)
+            .supportsHDL();
 
     private final DataField memory;
     private final ObservableValue out1;

src/main/java/de/neemann/digital/core/wiring/BitSelector.java

@@ -29,7 +29,8 @@ public class BitSelector extends Node implements Element {
             input("sel"))
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.SELECTOR_BITS)
-            .addAttribute(Keys.FLIP_SEL_POSITON);
+            .addAttribute(Keys.FLIP_SEL_POSITON)
+            .supportsHDL();
 
     private final ObservableValue output;
     private final int selBits;

src/main/java/de/neemann/digital/core/wiring/Clock.java

@@ -24,7 +24,8 @@ public class Clock implements Element {
             .addAttribute(Keys.LABEL)
             .addAttribute(Keys.RUN_AT_REAL_TIME)
             .addAttribute(Keys.FREQUENCY)
-            .addAttribute(Keys.PINNUMBER);
+            .addAttribute(Keys.PINNUMBER)
+            .supportsHDL();
 
     private final ObservableValue output;
     private final int frequency;

src/main/java/de/neemann/digital/core/wiring/Decoder.java

@@ -40,7 +40,8 @@ public class Decoder extends Node implements Element, Countable {
             input("sel"))
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.SELECTOR_BITS)
-            .addAttribute(Keys.FLIP_SEL_POSITON);
+            .addAttribute(Keys.FLIP_SEL_POSITON)
+            .supportsHDL();
 
     /**
      * Creates a new instance

src/main/java/de/neemann/digital/core/wiring/Demultiplexer.java

@@ -46,7 +46,8 @@ public class Demultiplexer extends Node implements Element, Countable {
             .addAttribute(Keys.BITS)
             .addAttribute(Keys.SELECTOR_BITS)
             .addAttribute(Keys.FLIP_SEL_POSITON)
-            .addAttribute(Keys.DEFAULT);
+            .addAttribute(Keys.DEFAULT)
+            .supportsHDL();
 
     /**
      * Creates a new instance

src/main/java/de/neemann/digital/core/wiring/Driver.java

@@ -30,7 +30,8 @@ public class Driver extends Node implements Element, Countable {
             input("sel"))
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.BITS)
-            .addAttribute(Keys.FLIP_SEL_POSITON);
+            .addAttribute(Keys.FLIP_SEL_POSITON)
+            .supportsHDL();
 
     private final ObservableValue output;
     private final int bits;

src/main/java/de/neemann/digital/core/wiring/DriverInvSel.java

@@ -24,7 +24,8 @@ public class DriverInvSel extends Driver {
             input("sel"))
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.BITS)
-            .addAttribute(Keys.FLIP_SEL_POSITON);
+            .addAttribute(Keys.FLIP_SEL_POSITON)
+            .supportsHDL();
 
     /**
      * Creates a new instance

src/main/java/de/neemann/digital/core/wiring/Multiplexer.java

@@ -41,7 +41,8 @@ public class Multiplexer extends FanIn {
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.BITS)
             .addAttribute(Keys.SELECTOR_BITS)
-            .addAttribute(Keys.FLIP_SEL_POSITON);
+            .addAttribute(Keys.FLIP_SEL_POSITON)
+            .supportsHDL();
 
     /**
      * Creates a new instance

src/main/java/de/neemann/digital/core/wiring/PriorityEncoder.java

@@ -36,7 +36,8 @@ public class PriorityEncoder extends Node implements Element, Countable {
     }
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.LABEL)
-            .addAttribute(Keys.SELECTOR_BITS);
+            .addAttribute(Keys.SELECTOR_BITS)
+            .supportsHDL();
 
 
     private final ObservableValue selOut;

src/main/java/de/neemann/digital/core/wiring/Reset.java

@@ -26,7 +26,8 @@ public class Reset implements Element {
     public static final ElementTypeDescription DESCRIPTION = new ElementTypeDescription("Reset", Reset.class)
             .addAttribute(Keys.ROTATE)
             .addAttribute(Keys.LABEL)
-            .addAttribute(Keys.INVERT_OUTPUT);
+            .addAttribute(Keys.INVERT_OUTPUT)
+            .supportsHDL();
 
     private final ObservableValue output;
     private final boolean invOut;

src/main/java/de/neemann/digital/core/wiring/Splitter.java

@@ -58,7 +58,8 @@ public class Splitter implements Element {
             .addAttribute(Keys.INPUT_SPLIT)
             .addAttribute(Keys.OUTPUT_SPLIT)
             .addAttribute(Keys.SPLITTER_SPREADING)
-            .setShortName("");
+            .setShortName("")
+            .supportsHDL();
 
     private final ObservableValues outputs;
     private final Ports inPorts;

src/main/java/de/neemann/digital/draw/elements/Tunnel.java

@@ -27,7 +27,8 @@ public class Tunnel implements Element {
     public static final ElementTypeDescription DESCRIPTION
             = new ElementTypeDescription(Tunnel.class, input("in"))
             .addAttribute(Keys.ROTATE)
-            .addAttribute(Keys.NETNAME);
+            .addAttribute(Keys.NETNAME)
+            .supportsHDL();
 
     private final String label;
 

src/main/java/de/neemann/digital/hdl/model2/HDLCircuit.java

@@ -48,9 +48,9 @@ public class HDLCircuit implements Iterable<HDLNode>, HDLModel.BitProvider, Prin
     private final ArrayList<HDLNet> listOfNets;
     private final String description;
     private final File origin;
+    private final ArrayList<HDLNode> nodes;
     private ArrayList<HDLPort> ports;
     private NetList netList;
-    private ArrayList<HDLNode> nodes;
     private HashMap<Net, HDLNet> nets;
     private String hdlEntityName;
 

src/main/java/de/neemann/digital/hdl/vhdl2/entities/VHDLTemplate.java

@@ -5,6 +5,7 @@
  */
 package de.neemann.digital.hdl.vhdl2.entities;
 
+import de.neemann.digital.core.element.ElementTypeDescription;
 import de.neemann.digital.hdl.hgs.*;
 import de.neemann.digital.hdl.hgs.function.JavaClass;
 import de.neemann.digital.hdl.model2.HDLNode;
@@ -13,6 +14,7 @@ import de.neemann.digital.hdl.vhdl2.Separator;
 import de.neemann.digital.lang.Lang;
 
 import java.io.IOException;
+import java.net.URL;
 import java.util.ArrayList;
 import java.util.HashMap;
 
@@ -49,6 +51,21 @@ public class VHDLTemplate implements VHDLEntity {
         return "vhdl/" + name + ".tem";
     }
 
+    /**
+     * Returns true, if a hdl template is available.
+     *
+     * @param etd the {@link ElementTypeDescription}
+     * @return true if VHDL template is available
+     */
+    public static boolean isTemplate(ElementTypeDescription etd) {
+        ClassLoader cl = etd.getClassLoader();
+        if (cl == null)
+            cl = ClassLoader.getSystemClassLoader();
+        URL url = cl.getResource(createFileName(ENTITY_PREFIX + etd.getName()));
+        return url != null;
+    }
+
+
     /**
      * Creates the name of the file used to load the vhdl file for the given element
      *

src/main/java/de/neemann/digital/testing/TestCaseElement.java

@@ -27,7 +27,8 @@ public class TestCaseElement implements Element {
             = new ElementTypeDescription("Testcase", TestCaseElement.class)
             .addAttribute(Keys.LABEL)
             .addAttribute(TESTDATA)
-            .addAttribute(Keys.ENABLED);
+            .addAttribute(Keys.ENABLED)
+            .supportsHDL();
 
     /**
      * creates a new instance

src/main/resources/lang/lang_de.xml

@@ -1955,12 +1955,15 @@ Stellen Sie sicher, dass der Flash-Vorgang abgeschlossen ist, bevor Sie diesen D
 
     <string name="msg_renameNet">Netz umbenennen</string>
     <string name="msg_renameNet_N_OLD_NEW">Es gibt noch {0} weitere Tunnel mit dem Netznamen ''{1}''.
-        Sollen alle {0} zu ''{2}'' umbenannt werden?</string>
+        Sollen alle {0} zu ''{2}'' umbenannt werden?
+    </string>
 
     <string name="msg_dataWillBeLost_n">Sollen die Änderungen im Feld "{0}" wirklich verworfen werden?</string>
     <string name="btn_copyToClipboard">Zwischenablage</string>
     <string name="btn_copyToClipboard_tt">Kopiert den Text in die Zwischenablage.</string>
 
+    <string name="msg_supportsHDL">Exportierbar zu VHDL/Verilog.</string>
+
     <string name="ok">Ok</string>
     <string name="rot_0">0°</string>
     <string name="rot_180">180°</string>

src/main/resources/lang/lang_en.xml

@@ -1910,10 +1910,13 @@ Make sure the flash process is complete before closing this dialog!</string>
 
     <string name="msg_renameNet">Rename Net</string>
     <string name="msg_renameNet_N_OLD_NEW">There are {0} more tunnels with the net name ''{1}''.
-        Do you want to rename all {0} to ''{2}''?</string>
+        Do you want to rename all {0} to ''{2}''?
+    </string>
 
     <string name="msg_dataWillBeLost_n">Do you really want to discard the changes in the "{0}" field?</string>
 
+    <string name="msg_supportsHDL">Exportable to VHDL/Verilog.</string>
+
     <string name="err_vgaModeNotDetected_N">Video mode was not detected ({0})</string>
 
     <string name="ok">OK</string>

src/test/java/de/neemann/digital/hdl/TestHDLExportFlag.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2020 Helmut Neemann.
+ * Use of this source code is governed by the GPL v3 license
+ * that can be found in the LICENSE file.
+ */
+package de.neemann.digital.hdl;
+
+import de.neemann.digital.core.element.ElementTypeDescription;
+import de.neemann.digital.draw.library.ElementLibrary;
+import de.neemann.digital.hdl.vhdl2.entities.VHDLTemplate;
+import junit.framework.TestCase;
+
+public class TestHDLExportFlag extends TestCase {
+
+    public void testHDLExportFlag() {
+        ElementLibrary lib = new ElementLibrary();
+        for (ElementLibrary.ElementContainer ec : lib) {
+            ElementTypeDescription etd = ec.getDescription();
+            boolean hdlExportFlag = etd.isSupportsHDL();
+            if (VHDLTemplate.isTemplate(etd))
+                assertTrue("HDL template available for " + etd.getName(), hdlExportFlag);
+        }
+    }
+}