refactoring of file handling in ROM component

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

@@ -73,6 +73,13 @@ public class ElementAttributes implements HGSMap {
                 value = (VALUE) value.toString();
                 attributes.put(key.getKey(), value);
             }
+
+            // needed to fix files with int pin numbers!
+            if (key == Keys.LAST_DATA_FILE && value instanceof String) {
+                value = (VALUE) new File(value.toString());
+                attributes.put(key.getKey(), value);
+            }
+
             return value;
         }
     }

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

@@ -381,6 +381,12 @@ public final class Keys {
     public static final Key<Boolean> AUTO_RELOAD_ROM
             = new Key<>("autoReload", false).setSecondary();
 
+    /**
+     * The last used ROM data file
+     */
+    public static final Key<File> LAST_DATA_FILE
+            = new Key.KeyFile("lastDataFile", new File("")).setDependsOn(AUTO_RELOAD_ROM).setSecondary();
+
     /**
      * flag to show the data table window
      */

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

@@ -5,7 +5,6 @@
  */
 package de.neemann.digital.core.memory;
 
-import de.neemann.digital.FileLocator;
 import de.neemann.digital.core.*;
 import de.neemann.digital.core.element.Element;
 import de.neemann.digital.core.element.ElementAttributes;
@@ -25,10 +24,6 @@ import static de.neemann.digital.core.element.PinInfo.input;
  * A ROM module.
  */
 public class ROM extends Node implements Element, ROMInterface, ProgramMemory {
-    /**
-     * Key used to store the source file in the attribute set
-     */
-    public final static String LAST_DATA_FILE_KEY = "lastDataFile";
 
     /**
      * The ROMs {@link ElementTypeDescription}
@@ -44,6 +39,7 @@ public class ROM extends Node implements Element, ROMInterface, ProgramMemory {
             .addAttribute(Keys.INT_FORMAT)
             .addAttribute(Keys.IS_PROGRAM_MEMORY)
             .addAttribute(Keys.AUTO_RELOAD_ROM)
+            .addAttribute(Keys.LAST_DATA_FILE)
             .supportsHDL();
 
     private DataField data;
@@ -51,14 +47,14 @@ public class ROM extends Node implements Element, ROMInterface, ProgramMemory {
     private final ObservableValue output;
     private final int addrBits;
     private final int dataBits;
-    private final File hexFile;
     private final boolean autoLoad;
     private final boolean isProgramMemory;
+    private final ElementAttributes attr;
+    private final String label;
     private ObservableValue addrIn;
     private ObservableValue selIn;
     private int addr;
     private boolean sel;
-    private String label;
 
     /**
      * Creates a new instance
@@ -71,12 +67,12 @@ public class ROM extends Node implements Element, ROMInterface, ProgramMemory {
         data = attr.get(Keys.DATA);
         addrBits = attr.get(Keys.ADDR_BITS);
         autoLoad = attr.get(Keys.AUTO_RELOAD_ROM);
+        if (autoLoad)
+            this.attr = attr;
+        else
+            this.attr = null;
         label = attr.getLabel();
         isProgramMemory = attr.isProgramMemory();
-        if (autoLoad) {
-            hexFile = attr.getFile(LAST_DATA_FILE_KEY);
-        } else
-            hexFile = null;
         formatter = attr.getValueFormatter();
     }
 
@@ -118,10 +114,10 @@ public class ROM extends Node implements Element, ROMInterface, ProgramMemory {
     @Override
     public void init(Model model) throws NodeException {
         if (autoLoad) {
-            if (hexFile == null)
+            if (attr == null)
                 throw new NodeException(Lang.get("err_ROM_noFileGivenToLoad"), this, -1, null);
             try {
-                File f = new FileLocator(hexFile).setLibraryRoot(model.getRootPath()).locate();
+                File f = attr.getFile(Keys.LAST_DATA_FILE, model.getRootPath());
                 data = Importer.read(f, dataBits);
             } catch (IOException e) {
                 throw new NodeException(e.getMessage(), this, -1, null);

src/main/java/de/neemann/digital/gui/components/AttributeDialog.java

@@ -20,6 +20,7 @@ import java.awt.event.ActionEvent;
 import java.awt.event.KeyEvent;
 import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;
+import java.io.File;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
@@ -376,6 +377,17 @@ public class AttributeDialog extends JDialog {
         return null;
     }
 
+    /**
+     * @return the root file or null if not available
+     */
+    public File getRootFile() {
+        File root = null;
+        Main main = getMain();
+        if (main != null)
+            root = main.getLibrary().getRootFilePath();
+        return root;
+    }
+
     /**
      * @return the visual element of this dialog, maybe null
      */

src/main/java/de/neemann/digital/gui/components/DataEditor.java

@@ -40,6 +40,7 @@ import java.util.StringTokenizer;
  */
 public class DataEditor extends JDialog {
     private static final Color MYGRAY = new Color(230, 230, 230);
+    private static File lastUsedFileName;
     private final ValueFormatter addrFormat;
     private final int addrBits;
     private final DataField localDataField;
@@ -144,11 +145,10 @@ public class DataEditor extends JDialog {
                 @Override
                 public void actionPerformed(ActionEvent e) {
                     JFileChooser fc = new MyFileChooser();
-                    if (fileName != null)
+                    setFileNameTo(fc);
-                        fc.setSelectedFile(fileName);
                     fc.setFileFilter(new FileNameExtensionFilter("hex", "hex"));
                     if (fc.showOpenDialog(DataEditor.this) == JFileChooser.APPROVE_OPTION) {
-                        fileName = fc.getSelectedFile();
+                        setFileName(fc.getSelectedFile());
                         try {
                             DataField dataRead = Importer.read(fc.getSelectedFile(), dataBits)
                                     .trimValues(addrBits, dataBits);
@@ -164,12 +164,11 @@ public class DataEditor extends JDialog {
                 @Override
                 public void actionPerformed(ActionEvent e) {
                     JFileChooser fc = new MyFileChooser();
-                    if (fileName != null)
+                    setFileNameTo(fc);
-                        fc.setSelectedFile(fileName);
                     fc.setFileFilter(new FileNameExtensionFilter("hex", "hex"));
                     new SaveAsHelper(DataEditor.this, fc, "hex").checkOverwrite(
                             file -> {
-                                fileName = fc.getSelectedFile();
+                                setFileName(file);
                                 localDataField.saveTo(file);
                             }
                     );
@@ -266,14 +265,17 @@ public class DataEditor extends JDialog {
      * @param fileName the filename
      */
     public void setFileName(File fileName) {
-        this.fileName = fileName;
+        if (fileName.exists()) {
+            this.fileName = fileName;
+            lastUsedFileName = fileName;
+        }
     }
 
-    /**
+    private void setFileNameTo(JFileChooser fc) {
-     * @return the file name last used
+        if (fileName != null)
-     */
+            fc.setSelectedFile(fileName);
-    public File getFileName() {
+        else if (lastUsedFileName != null)
-        return fileName;
+            fc.setSelectedFile(lastUsedFileName);
     }
 
     /**

src/main/java/de/neemann/digital/gui/components/EditorFactory.java

@@ -5,7 +5,6 @@
  */
 package de.neemann.digital.gui.components;
 
-import de.neemann.digital.FileLocator;
 import de.neemann.digital.core.Bits;
 import de.neemann.digital.core.*;
 import de.neemann.digital.core.element.*;
@@ -14,8 +13,6 @@ import de.neemann.digital.core.extern.PortDefinition;
 import de.neemann.digital.core.io.InValue;
 import de.neemann.digital.core.io.MIDIHelper;
 import de.neemann.digital.core.memory.DataField;
-import de.neemann.digital.core.memory.ROM;
-import de.neemann.digital.core.memory.importer.Importer;
 import de.neemann.digital.core.memory.rom.ROMManger;
 import de.neemann.digital.draw.elements.PinException;
 import de.neemann.digital.draw.elements.VisualElement;
@@ -25,7 +22,6 @@ import de.neemann.digital.draw.model.InverterConfig;
 import de.neemann.digital.draw.model.ModelCreator;
 import de.neemann.digital.draw.shapes.custom.CustomShapeDescription;
 import de.neemann.digital.gui.Main;
-import de.neemann.digital.gui.SaveAsHelper;
 import de.neemann.digital.gui.components.table.ShowStringDialog;
 import de.neemann.digital.gui.components.testing.TestCaseDescriptionEditor;
 import de.neemann.digital.lang.Lang;
@@ -640,62 +636,19 @@ public final class EditorFactory {
                         int dataBits = attr.get(Keys.BITS);
                         int addrBits = getAddrBits(attr);
                         DataEditor de = new DataEditor(panel, data, dataBits, addrBits, false, SyncAccess.NOSYNC, attr.getValueFormatter());
-                        de.setFileName(new FileLocator(attr.getFile(ROM.LAST_DATA_FILE_KEY))
+                        if (attr.get(Keys.AUTO_RELOAD_ROM))
-                                .setupWithMain(getAttributeDialog().getMain())
+                            de.setFileName(attr.getFile(Keys.LAST_DATA_FILE, getAttributeDialog().getRootFile()));
-                                .locate());
                         if (de.showDialog()) {
                             DataField mod = de.getModifiedDataField();
                             if (!data.equals(mod))
                                 majorModification = true;
                             data = mod;
-                            attr.setFile(ROM.LAST_DATA_FILE_KEY, de.getFileName());
                         }
                     } catch (EditorParseException e1) {
                         new ErrorMessage(Lang.get("msg_invalidEditorValue")).addCause(e1).show(panel);
                     }
                 }
             }.createJButton());
-            panel.add(new ToolTipAction(Lang.get("btn_reload")) {
-                        @Override
-                        public void actionPerformed(ActionEvent e) {
-                            try {
-                                getAttributeDialog().storeEditedValues();
-                                int dataBits = attr.get(Keys.BITS);
-                                data = Importer.read(new FileLocator(attr.getFile(ROM.LAST_DATA_FILE_KEY))
-                                        .setupWithMain(getAttributeDialog().getMain())
-                                        .locate(), dataBits)
-                                        .trimValues(getAddrBits(attr), dataBits);
-                            } catch (IOException e1) {
-                                new ErrorMessage(Lang.get("msg_errorReadingFile")).addCause(e1).show(panel);
-                            } catch (EditorParseException e1) {
-                                new ErrorMessage(Lang.get("msg_invalidEditorValue")).addCause(e1).show(panel);
-                            }
-                        }
-                    }
-                            .setEnabledChain(attr.getFile(ROM.LAST_DATA_FILE_KEY) != null)
-                            .setToolTip(Lang.get("btn_reload_tt"))
-                            .createJButton()
-            );
-            panel.add(new ToolTipAction(Lang.get("btn_save")) {
-                        @Override
-                        public void actionPerformed(ActionEvent e) {
-                            try {
-                                getAttributeDialog().storeEditedValues();
-                                final File file = new FileLocator(attr.getFile(ROM.LAST_DATA_FILE_KEY))
-                                        .setupWithMain(getAttributeDialog().getMain())
-                                        .locate();
-                                data.saveTo(SaveAsHelper.checkSuffix(file, "hex"));
-                            } catch (IOException e1) {
-                                new ErrorMessage(Lang.get("msg_errorWritingFile")).addCause(e1).show(panel);
-                            } catch (EditorParseException e1) {
-                                new ErrorMessage(Lang.get("msg_invalidEditorValue")).addCause(e1).show(panel);
-                            }
-                        }
-                    }
-                            .setEnabledChain(attr.getFile(ROM.LAST_DATA_FILE_KEY) != null)
-                            .setToolTip(Lang.get("btn_saveAsHex_tt"))
-                            .createJButton()
-            );
             return panel;
         }
 
@@ -814,10 +767,7 @@ public final class EditorFactory {
                         if (app != null) {
                             try {
                                 getAttributeDialog().storeEditedValues();
-                                File root = null;
+                                File root = getAttributeDialog().getRootFile();
-                                Main main = getAttributeDialog().getMain();
-                                if (main != null)
-                                    root = main.getLibrary().getRootFilePath();
                                 final boolean consistent = app.ensureConsistency(elementAttributes, root);
                                 if (consistent)
                                     getAttributeDialog().updateEditedValues();

src/main/java/de/neemann/digital/hdl/hgs/Context.java

@@ -681,14 +681,11 @@ public class Context implements HGSMap {
 
         @Override
         public Object call(Context c, ArrayList<Expression> args) throws HGSEvalException {
-            String name = args.get(0).value(c).toString();
+            File name = new File(args.get(0).value(c).toString());
             int dataBits = Value.toInt(args.get(1).value(c));
-            FileLocator fileLocator = new FileLocator(name);
+            File hexFile = new FileLocator(name).setLibraryRoot(c.getRootPath()).locate();
-            if (c.contains(BASE_FILE_KEY))
-                fileLocator.setBaseFile((File) c.getVar(BASE_FILE_KEY));
-            File hexFile = fileLocator.locate();
 
-            if (hexFile == null)
+            if (hexFile == null || !hexFile.exists())
                 throw new HGSEvalException("File " + name + " not found! Is circuit saved?");
 
             try {
@@ -709,9 +706,7 @@ public class Context implements HGSMap {
         @Override
         public Object call(Context c, ArrayList<Expression> args) throws HGSEvalException {
             File f = new File(args.get(0).value(c).toString());
-            File root = c.getRootPath();
+            f = new FileLocator(f).setLibraryRoot(c.getRootPath()).locate();
-            if (root != null)
-                f = new FileLocator(f).setLibraryRoot(root).locate();
             try {
                 return Application.readCode(f);
             } catch (IOException e) {

src/main/resources/lang/lang_de.xml

@@ -19,10 +19,7 @@
     <string name="btn_edit">Bearbeiten</string>
     <string name="btn_editFurther">Weiter bearbeiten</string>
     <string name="btn_load">Laden</string>
-    <string name="btn_reload">Neu Laden</string>
-    <string name="btn_reload_tt">Letzte Datei noch einmal laden</string>
     <string name="btn_save">Speichern</string>
-    <string name="btn_saveAsHex_tt">Als HEX-Datei speichern.</string>
     <string name="btn_create">Erzeugen</string>
     <string name="btn_create_tt">Erzeugt eine Schaltung in einem eigenen Fenster.</string>
     <string name="btn_editDetached">Permanent Bearbeiten</string>
@@ -1323,6 +1320,8 @@ Sind evtl. die Namen der Variablen nicht eindeutig?</string>
     <string name="key_Height_tt">Höhe des Symbols, wenn diese Schaltung in eine andere eingefügt wird.</string>
     <string name="key_autoReload">Bei jedem Start automatisch neu laden.</string><!-- ROM -->
     <string name="key_autoReload_tt">Lädt das HEX-File bei jedem Modelstart neu.</string>
+    <string name="key_lastDataFile">Datei</string>
+    <string name="key_lastDataFile_tt">Datei die in das ROM geladen wird!</string>
     <string name="key_flipSelPos">Tausche Selektorposition</string><!-- Driver, DriverInvSel, Multiplexer, Demultiplexer, Decoder -->
     <string name="key_flipSelPos_tt">Mit dieser Option kann der Anschluss des Selektors auf die andere Seite des Multiplexers verschoben werden.</string>
     <string name="key_intFormat">Zahlenformat</string><!-- Probe -->

src/main/resources/lang/lang_en.xml

@@ -19,10 +19,7 @@
     <string name="btn_edit">Edit</string>
     <string name="btn_editFurther">Continue editing</string>
     <string name="btn_load">Load</string>
-    <string name="btn_reload">Reload</string>
-    <string name="btn_reload_tt">Reload last HEX file</string>
     <string name="btn_save">Save</string>
-    <string name="btn_saveAsHex_tt">Save as HEX file.</string>
     <string name="btn_create">Create</string>
     <string name="btn_create_tt">Create a circuit in a separate window</string>
     <string name="btn_editDetached">Edit detached</string>
@@ -1304,6 +1301,8 @@
     <string name="key_Height_tt">Height of symbol if this circuit is used as an component in an other circuit.</string>
     <string name="key_autoReload">Reload at model start</string><!-- ROM -->
     <string name="key_autoReload_tt">Reloads the HEX file every time the model is started.</string>
+    <string name="key_lastDataFile">File</string>
+    <string name="key_lastDataFile_tt">File to be loaded into the ROM.</string>
     <string name="key_flipSelPos">Flip selector position
     </string><!-- Driver, DriverInvSel, Multiplexer, Demultiplexer, Decoder -->
     <string name="key_flipSelPos_tt">This option allows you to move te selector pin to the opposite side of the

src/main/resources/lang/lang_es.xml

@@ -25,10 +25,7 @@ In the file howTo.md you can find more details about translations.
     <string name="btn_edit">Editar</string>
     <string name="btn_editFurther">Seguir editando</string>
     <string name="btn_load">Cargar</string>
-    <string name="btn_reload">Recargar</string>
-    <string name="btn_reload_tt">Recargar último archivo HEX</string>
     <string name="btn_save">Guardar</string>
-    <string name="btn_saveAsHex_tt">Guardar como archivo HEX</string>
     <string name="btn_create">Crear</string>
     <string name="btn_create_tt">Crear un circuito en otra ventana</string>
     <string name="btn_editDetached">Editar por separado</string>

src/main/resources/lang/lang_es_ref.xml

@@ -24,10 +24,7 @@ In the file howTo.md you can find more details about translations.
     <string name="btn_edit">Edit</string>
     <string name="btn_editFurther">Continue editing</string>
     <string name="btn_load">Load</string>
-    <string name="btn_reload">Reload</string>
-    <string name="btn_reload_tt">Reload last HEX file</string>
     <string name="btn_save">Save</string>
-    <string name="btn_saveAsHex_tt">Save as HEX file.</string>
     <string name="btn_create">Create</string>
     <string name="btn_create_tt">Create a circuit in a separate window</string>
     <string name="btn_editDetached">Edit detached</string>

src/main/resources/lang/lang_fr.xml

@@ -25,10 +25,7 @@ In the file howTo.md you can find more details about translations.
     <string name="btn_edit">Éditer</string>
     <string name="btn_editFurther">Continuer l'édition</string>
     <string name="btn_load">Charger</string>
-    <string name="btn_reload">Recharger</string>
-    <string name="btn_reload_tt">Recharger le dernier fichier HEX</string>
     <string name="btn_save">Enregistrer</string>
-    <string name="btn_saveAsHex_tt">Enregistrer en fichier HEX.</string>
     <string name="btn_create">Créer</string>
     <string name="btn_create_tt">Créer un circuit dans une fenêtre séparée.</string>
     <string name="btn_editDetached">Éditer séparément</string>

src/main/resources/lang/lang_fr_ref.xml

@@ -24,10 +24,7 @@ In the file howTo.md you can find more details about translations.
     <string name="btn_edit">Edit</string>
     <string name="btn_editFurther">Continue editing</string>
     <string name="btn_load">Load</string>
-    <string name="btn_reload">Reload</string>
-    <string name="btn_reload_tt">Reload last HEX file</string>
     <string name="btn_save">Save</string>
-    <string name="btn_saveAsHex_tt">Save as HEX file.</string>
     <string name="btn_create">Create</string>
     <string name="btn_create_tt">Create a circuit in a separate window</string>
     <string name="btn_editDetached">Edit detached</string>

src/main/resources/lang/lang_pt.xml

@@ -25,10 +25,7 @@ In the file howTo.md you can find more details about translations.
     <string name="btn_edit">Editar</string>
     <string name="btn_editFurther">Continuar edição</string>
     <string name="btn_load">Carregar</string>
-    <string name="btn_reload">Recarregar</string>
-    <string name="btn_reload_tt">Recarregar último arquivo em hexadecimal</string>
     <string name="btn_save">Salvar</string>
-    <string name="btn_saveAsHex_tt">Salvar como arquivo HEX.</string>
     <string name="btn_create">Criar</string>
     <string name="btn_create_tt">Criar circuito em janela separada</string>
     <string name="btn_editDetached">Editar em separado</string>

src/main/resources/lang/lang_pt_ref.xml

@@ -24,10 +24,7 @@ In the file howTo.md you can find more details about translations.
     <string name="btn_edit">Edit</string>
     <string name="btn_editFurther">Continue editing</string>
     <string name="btn_load">Load</string>
-    <string name="btn_reload">Reload</string>
-    <string name="btn_reload_tt">Reload last HEX file</string>
     <string name="btn_save">Save</string>
-    <string name="btn_saveAsHex_tt">Save as HEX file.</string>
     <string name="btn_create">Create</string>
     <string name="btn_create_tt">Create a circuit in a separate window</string>
     <string name="btn_editDetached">Edit detached</string>

src/main/resources/lang/lang_zh.xml

@@ -25,10 +25,7 @@ In the file howTo.md you can find more details about translations.
   <string name="btn_edit">编辑</string>
   <string name="btn_editFurther">继续编辑</string>
   <string name="btn_load">载入</string>
-  <string name="btn_reload">重新载入</string>
-  <string name="btn_reload_tt">重新载入最后使用的十六进制文件</string>
   <string name="btn_save">保存</string>
-  <string name="btn_saveAsHex_tt">另存为十六进制文件</string>
   <string name="btn_create">创建</string>
   <string name="btn_create_tt">在新窗口中创建电路</string>
   <string name="btn_editDetached">分离编辑</string>

src/main/resources/lang/lang_zh_ref.xml

@@ -24,10 +24,7 @@ In the file howTo.md you can find more details about translations.
   <string name="btn_edit">Edit</string>
   <string name="btn_editFurther">Continue editing</string>
   <string name="btn_load">Load</string>
-  <string name="btn_reload">Reload</string>
-    <string name="btn_reload_tt">Reload last HEX file</string>
   <string name="btn_save">Save</string>
-  <string name="btn_saveAsHex_tt">Save as HEX file.</string>
   <string name="btn_create">Create</string>
   <string name="btn_create_tt">Create a circuit in a separate window</string>
   <string name="btn_editDetached">Edit detached</string>

src/main/resources/verilog/DIG_ROM.v

@@ -3,7 +3,11 @@
         panic("err_romNeedsALabelToBeExported");
 
     romMaxSize := 1 << elem.AddrBits;
-    romSize := sizeOf(elem.Data);
+    data:=elem.Data;
+    if (elem.autoReload) {
+        data=loadHex(elem.lastDataFile, elem.Bits);
+    }
+    romSize := sizeOf(data);
     moduleName = format("%s_%dX%d_%s", moduleName, romMaxSize, elem.Bits, identifier(elem.Label));
     dBitRange := format("[%d:0]", elem.Bits - 1);
     aBitRange := format("[%d:0]", elem.AddrBits - 1);
@@ -30,7 +34,7 @@
     initial begin<?
 
     for (i := 0; i < romSize; i++) { ?>
-        my_rom[<?= i ?>] = <?= format("%d'h%x", elem.Bits, elem.Data[i]) ?>;<?
+        my_rom[<?= i ?>] = <?= format("%d'h%x", elem.Bits, data[i]) ?>;<?
     } ?>
     end
 endmodule

src/main/resources/vhdl/DIG_ROM.tem

@@ -6,6 +6,13 @@ use IEEE.NUMERIC_STD.ALL;
         panic("err_romNeedsALabelToBeExported");
 
     entityName:="DIG_ROM_"+identifier(elem.Label);
+
+    data:=elem.Data;
+    if (elem.autoReload) {
+        data=loadHex(elem.lastDataFile, elem.Bits);
+    }
+    len:=sizeOf(data);
+
 ?>
 entity <?=entityName?> is
   port (
@@ -15,16 +22,15 @@ entity <?=entityName?> is
 end <?=entityName?>;
 
 architecture Behavioral of <?=entityName?> is
-  type mem is array ( 0 to <?=sizeOf(elem.Data)-1?>) of <?= vhdl.type(elem.Bits)?>;
+  type mem is array ( 0 to <?=len-1?>) of <?= vhdl.type(elem.Bits)?>;
   constant my_Rom : mem := (
     <?
 
-    len:=sizeOf(elem.Data);
     maxCol:=76/(elem.Bits+4);
 
     col:=0;
     for (i:=0;i<len;i++) {
-        print( vhdl.value(elem.Data[i],elem.Bits));
+        print( vhdl.value(data[i],elem.Bits));
         if (i<len-1) {
             print(", ");
         }
@@ -41,7 +47,7 @@ begin
   begin
     if sel='0' then
       D <= <? if (elem.Bits>1) {?>(others => 'Z')<? } else {?>'Z'<? } ?>;
-    elsif A > <?= vhdl.value(sizeOf(elem.Data)-1,elem.AddrBits)?> then
+    elsif A > <?= vhdl.value(len-1,elem.AddrBits)?> then
       D <= <?= vhdl.zero(elem.Bits)?>;
     else
       D <= my_rom(to_integer(unsigned(A)));