diff --git a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/AbstractTxStream.java b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/AbstractTxStream.java
index 2dce2f3..4a64708 100644
--- a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/AbstractTxStream.java
+++ b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/AbstractTxStream.java
@@ -142,6 +142,11 @@ abstract class AbstractTxStream extends HierNode implements IWaveform {
 		return rowCount;
 	}
 
+	@Override
+	public int getWidth() {
+		return 0;
+	}
+
 	/**
 	 * Calculate concurrency.
 	 */
diff --git a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrDbLoader.java b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrDbLoader.java
index 483651f..d84610d 100644
--- a/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrDbLoader.java
+++ b/plugins/com.minres.scviewer.database.ftr/src/com/minres/scviewer/database/ftr/FtrDbLoader.java
@@ -184,7 +184,7 @@ public class FtrDbLoader implements IWaveformDbLoader {
 	 * @throws InputFormatException the input format exception
 	 */
 	@Override
-	public void load(IWaveformDb db, File file) throws InputFormatException {
+	public void load(File file) throws InputFormatException {
 		dispose();
 		this.file=file;
 		try {
diff --git a/plugins/com.minres.scviewer.database.sqlite/src/com/minres/scviewer/database/sqlite/AbstractTxStream.java b/plugins/com.minres.scviewer.database.sqlite/src/com/minres/scviewer/database/sqlite/AbstractTxStream.java
index cb46eff..9b92b58 100644
--- a/plugins/com.minres.scviewer.database.sqlite/src/com/minres/scviewer/database/sqlite/AbstractTxStream.java
+++ b/plugins/com.minres.scviewer.database.sqlite/src/com/minres/scviewer/database/sqlite/AbstractTxStream.java
@@ -71,6 +71,11 @@ abstract class AbstractTxStream extends HierNode implements IWaveform {
 		return maxConcurrency;
 	}
 
+	@Override
+	public int getWidth() {
+		return 0;
+	}
+
 	@Override
 	public  IEventList getEvents(){
 		if(events==null){
diff --git a/plugins/com.minres.scviewer.database.sqlite/src/com/minres/scviewer/database/sqlite/SQLiteDbLoader.java b/plugins/com.minres.scviewer.database.sqlite/src/com/minres/scviewer/database/sqlite/SQLiteDbLoader.java
index 7a47697..ec70b55 100644
--- a/plugins/com.minres.scviewer.database.sqlite/src/com/minres/scviewer/database/sqlite/SQLiteDbLoader.java
+++ b/plugins/com.minres.scviewer.database.sqlite/src/com/minres/scviewer/database/sqlite/SQLiteDbLoader.java
@@ -21,7 +21,6 @@ import java.util.Collection;
 import java.util.List;
 
 import com.minres.scviewer.database.IWaveform;
-import com.minres.scviewer.database.IWaveformDb;
 import com.minres.scviewer.database.IWaveformDbLoader;
 import com.minres.scviewer.database.InputFormatException;
 import com.minres.scviewer.database.RelationType;
@@ -94,8 +93,8 @@ public class SQLiteDbLoader implements IWaveformDbLoader {
 //	}
 
 	@Override
-	public void load(IWaveformDb db, File file) throws InputFormatException {
-		database=new SQLiteDatabase(file.getAbsolutePath(), db);
+	public void load(File file) throws InputFormatException {
+		database=new SQLiteDatabase(file.getAbsolutePath());
 		database.setData("TIMERESOLUTION", 1L);
 		SQLiteDatabaseSelectHandler<ScvSimProps> handler = new SQLiteDatabaseSelectHandler<>(ScvSimProps.class, database);
 		try {
diff --git a/plugins/com.minres.scviewer.database.sqlite/src/com/minres/scviewer/database/sqlite/db/SQLiteDatabase.java b/plugins/com.minres.scviewer.database.sqlite/src/com/minres/scviewer/database/sqlite/db/SQLiteDatabase.java
index 5e1d31e..519c885 100644
--- a/plugins/com.minres.scviewer.database.sqlite/src/com/minres/scviewer/database/sqlite/db/SQLiteDatabase.java
+++ b/plugins/com.minres.scviewer.database.sqlite/src/com/minres/scviewer/database/sqlite/db/SQLiteDatabase.java
@@ -26,8 +26,6 @@ public class SQLiteDatabase implements IDatabase {
 
 	protected String dbFileName;
 	
-	protected IWaveformDb waveformDb;
-	
 	protected HashMap<String, Object> props;
 	
     static {
@@ -43,10 +41,9 @@ public class SQLiteDatabase implements IDatabase {
 		}
     }
     
-	public SQLiteDatabase(String dbFileName, IWaveformDb waveformDb) {
+	public SQLiteDatabase(String dbFileName) {
 		super();
 		this.dbFileName = dbFileName;
-		this.waveformDb = waveformDb;
 		props = new HashMap<String, Object>();
 	}
 
@@ -96,7 +93,7 @@ public class SQLiteDatabase implements IDatabase {
 
 	@Override
 	public IWaveformDb getWaveformDb() {
-		return waveformDb;
+		return null;
 	}
 
 }
diff --git a/plugins/com.minres.scviewer.database.text/src/com/minres/scviewer/database/text/AbstractTxStream.java b/plugins/com.minres.scviewer.database.text/src/com/minres/scviewer/database/text/AbstractTxStream.java
index a3660ae..6950203 100644
--- a/plugins/com.minres.scviewer.database.text/src/com/minres/scviewer/database/text/AbstractTxStream.java
+++ b/plugins/com.minres.scviewer.database.text/src/com/minres/scviewer/database/text/AbstractTxStream.java
@@ -143,6 +143,10 @@ abstract class AbstractTxStream extends HierNode implements IWaveform {
 		return rowCount;
 	}
 
+	@Override
+	public int getWidth() {
+		return 0;
+	}
 	/**
 	 * Calculate concurrency.
 	 */
diff --git a/plugins/com.minres.scviewer.database.text/src/com/minres/scviewer/database/text/TextDbLoader.java b/plugins/com.minres.scviewer.database.text/src/com/minres/scviewer/database/text/TextDbLoader.java
index 63796ec..563af11 100644
--- a/plugins/com.minres.scviewer.database.text/src/com/minres/scviewer/database/text/TextDbLoader.java
+++ b/plugins/com.minres.scviewer.database.text/src/com/minres/scviewer/database/text/TextDbLoader.java
@@ -222,7 +222,7 @@ public class TextDbLoader implements IWaveformDbLoader {
 	 */
 	@SuppressWarnings("unchecked")
 	@Override
-	public void load(IWaveformDb db, File file) throws InputFormatException {
+	public void load(File file) throws InputFormatException {
 		dispose();
 		FileType fType = getFileType(file);
 		if (file.length() < MEMMAP_LIMIT * (fType!=FileType.PLAIN ? 1 : 10)
diff --git a/plugins/com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDDbLoader.java b/plugins/com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDDbLoader.java
index 8476df0..1801a50 100644
--- a/plugins/com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDDbLoader.java
+++ b/plugins/com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDDbLoader.java
@@ -71,7 +71,7 @@ public class VCDDbLoader implements IWaveformDbLoader, IVCDDatabaseBuilder {
 	 */
 	@SuppressWarnings("unchecked")
 	@Override
-	public void load(IWaveformDb db, File file) throws InputFormatException {
+	public void load(File file) throws InputFormatException {
 		dispose();
 		this.maxTime=0;
 		boolean res = false;
@@ -176,7 +176,7 @@ public class VCDDbLoader implements IWaveformDbLoader, IVCDDatabaseBuilder {
 	@Override
 	public int getNetWidth(int intValue) {
 		VCDSignal<?> signal = (VCDSignal<?>) signals.get(intValue);
-		return signal.getRowCount();
+		return signal.getWidth();
 	}
 
 	/* (non-Javadoc)
diff --git a/plugins/com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDFileParser.java b/plugins/com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDFileParser.java
index fdd3c4c..8976419 100644
--- a/plugins/com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDFileParser.java
+++ b/plugins/com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDFileParser.java
@@ -205,41 +205,17 @@ class VCDFileParser {
 				else
 					traceBuilder.appendTransition(net, currentTime, Double.parseDouble(value));
 			} else {
-				BitVector decodedValues = new BitVector(netWidth);
+				BitVector decodedValues;
 				if (value.equals("z") && netWidth > 1) {
+					decodedValues = new BitVector(netWidth);
 					for (int i = 0; i < netWidth; i++)
 						decodedValues.setValue(i, BitValue.Z);
 				} else if (value.equals("x") && netWidth > 1) {
+					decodedValues = new BitVector(netWidth);
 					for (int i = 0; i < netWidth; i++)
 						decodedValues.setValue(i, BitValue.X);
 				} else {
-					int stringIndex = 0;
-					for (int convertedIndex = netWidth -1; convertedIndex >=0; convertedIndex--) {
-						if(convertedIndex<value.length()) {
-							switch (value.charAt(stringIndex++)) {
-							case 'z':
-								decodedValues.setValue(convertedIndex, BitValue.Z);
-								break;
-
-							case '1':
-								decodedValues.setValue(convertedIndex, BitValue.ONE);
-								break;
-
-							case '0':
-								decodedValues.setValue(convertedIndex, BitValue.ZERO);
-								break;
-
-							case 'x':
-								decodedValues.setValue(convertedIndex, BitValue.X);
-								break;
-
-							default:
-								decodedValues.setValue(convertedIndex, BitValue.X);
-							}
-						} else {
-							decodedValues.setValue(convertedIndex, BitValue.ZERO);
-						}
-					}
+					decodedValues = BitVector.fromString(netWidth, value);
 				}
 				traceBuilder.appendTransition(net, currentTime, decodedValues);
 			}
diff --git a/plugins/com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDSignal.java b/plugins/com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDSignal.java
index 68b0127..f0c88a0 100644
--- a/plugins/com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDSignal.java
+++ b/plugins/com.minres.scviewer.database.vcd/src/com/minres/scviewer/database/vcd/VCDSignal.java
@@ -100,9 +100,13 @@ public class VCDSignal<T extends IEvent> extends HierNode implements IWaveform {
 	}
 
 	@Override
-	public int getRowCount() {
+	public int getWidth() {
 		return width;
 	}
+	@Override
+	public int getRowCount() {
+		return 1;
+	}
 
 	@Override
 	public String getKind() {
diff --git a/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/BitVector.java b/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/BitVector.java
index bf8c576..898230d 100644
--- a/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/BitVector.java
+++ b/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/BitVector.java
@@ -33,6 +33,37 @@ public class BitVector implements IEvent {
 			packedValues[i] = 0;
 	}
 
+	public static BitVector fromString(int netWidth, String value){
+		BitVector bv = new BitVector(netWidth);
+		int stringIndex = 0;
+		for (int convertedIndex = netWidth -1; convertedIndex >=0; convertedIndex--) {
+			if(convertedIndex<value.length()) {
+				switch (value.charAt(stringIndex++)) {
+				case 'z':
+					bv.setValue(convertedIndex, BitValue.Z);
+					break;
+
+				case '1':
+					bv.setValue(convertedIndex, BitValue.ONE);
+					break;
+
+				case '0':
+					bv.setValue(convertedIndex, BitValue.ZERO);
+					break;
+
+				case 'x':
+					bv.setValue(convertedIndex, BitValue.X);
+					break;
+
+				default:
+					bv.setValue(convertedIndex, BitValue.X);
+				}
+			} else {
+				bv.setValue(convertedIndex, BitValue.ZERO);
+			}
+		}
+		return bv;
+	}
 	/**
 	 * Sets the value.
 	 *
diff --git a/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/IWaveform.java b/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/IWaveform.java
index a558c1b..11b74a0 100644
--- a/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/IWaveform.java
+++ b/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/IWaveform.java
@@ -78,4 +78,11 @@ public interface IWaveform extends IHierNode {
 	 */
 	public int getRowCount();
 	
+	/**
+	 * Gets the width.
+	 *
+	 * @return the width
+	 */
+	public int getWidth();
+	
 }
diff --git a/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/IWaveformDbLoader.java b/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/IWaveformDbLoader.java
index 7c1d224..ee258c7 100644
--- a/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/IWaveformDbLoader.java
+++ b/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/IWaveformDbLoader.java
@@ -55,7 +55,7 @@ public interface IWaveformDbLoader {
 	 * @param inputFile the input file
 	 * @throws InputFormatException the input format exception
 	 */
-	public void load(IWaveformDb db, File inputFile) throws InputFormatException;
+	public void load(File inputFile) throws InputFormatException;
 
 	/**
 	 * Gets the max time.
diff --git a/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/internal/WaveformDb.java b/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/internal/WaveformDb.java
index 64961e3..6530b57 100644
--- a/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/internal/WaveformDb.java
+++ b/plugins/com.minres.scviewer.database/src/com/minres/scviewer/database/internal/WaveformDb.java
@@ -135,7 +135,7 @@ public class WaveformDb extends HierNode implements IWaveformDb, PropertyChangeL
 				IWaveformDbLoader loader = loaderFactory.getLoader();
 				loader.addPropertyChangeListener(this);
 				try {
-					loader.load(this, inp);
+					loader.load(inp);
 				} catch (Exception e) {
 					LOG.error("error loading file "+inp.getName(), e);
 					retval=false;
diff --git a/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/provider/TxDbLabelProvider.java b/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/provider/TxDbLabelProvider.java
index 220bc0c..6260f6b 100644
--- a/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/provider/TxDbLabelProvider.java
+++ b/plugins/com.minres.scviewer.e4.application/src/com/minres/scviewer/e4/application/provider/TxDbLabelProvider.java
@@ -139,7 +139,7 @@ public class TxDbLabelProvider implements ILabelProvider {
 			case FILTER:
 				break;
 			case SIGNAL:
-				if(((IWaveform) element).getRowCount()==1)
+				if(((IWaveform) element).getWidth()==1)
 					return signal;
 				else 
 					return wave;
diff --git a/plugins/com.minres.scviewer.ui/src/com/minres/scviewer/ui/views/provider/TxDbTreeLabelProvider.java b/plugins/com.minres.scviewer.ui/src/com/minres/scviewer/ui/views/provider/TxDbTreeLabelProvider.java
index 37d3784..53f3dbc 100644
--- a/plugins/com.minres.scviewer.ui/src/com/minres/scviewer/ui/views/provider/TxDbTreeLabelProvider.java
+++ b/plugins/com.minres.scviewer.ui/src/com/minres/scviewer/ui/views/provider/TxDbTreeLabelProvider.java
@@ -77,7 +77,7 @@ public class TxDbTreeLabelProvider implements ILabelProvider {
 			case FILTER:
 				break;
 			case SIGNAL:
-				if(((IWaveform) element).getRowCount()==1)
+				if(((IWaveform) element).getWidth()==1)
 					return signal;
 				else 
 					return wave;