diff --git a/crlcore/python/helpers/__init__.py b/crlcore/python/helpers/__init__.py
index c8cbd5df..16243a53 100644
--- a/crlcore/python/helpers/__init__.py
+++ b/crlcore/python/helpers/__init__.py
@@ -316,3 +316,23 @@ def staticInitialization ( quiet=False ):
   if not quiet: print '     - <%s>' % sysConfDir
   initTechno( quiet )
   return
+
+
+def netDirectionToStr ( netDir ):
+   flags = [ '-', '-', '-', '-', '-' ]
+   if netDir & Hurricane.Net.Direction.DirIn:        flags[0] = 'i'
+   if netDir & Hurricane.Net.Direction.DirOut:       flags[1] = 'o'
+   if netDir & Hurricane.Net.Direction.ConnTristate: flags[2] = 't'
+   if netDir & Hurricane.Net.Direction.ConnWiredOr:  flags[3] = 'w'
+
+   s = flags[0]+flags[1]+flags[2]+flags[3]+' '
+   if   netDir == Hurricane.Net.Direction.UNDEFINED: s += '(UNDEFINED)'
+   elif netDir == Hurricane.Net.Direction.IN:        s += '(IN)'
+   elif netDir == Hurricane.Net.Direction.OUT:       s += '(OUT)'
+   elif netDir == Hurricane.Net.Direction.INOUT:     s += '(INOUT)'
+   elif netDir == Hurricane.Net.Direction.TRISTATE:  s += '(TRISTATE)'
+   elif netDir == Hurricane.Net.Direction.TRANSCV:   s += '(TRANSCV)'
+   elif netDir == Hurricane.Net.Direction.WOR_OUT:   s += '(WOR_OUT)'
+   elif netDir == Hurricane.Net.Direction.WOR_INOUT: s += '(WOR_INOUT)'
+   else: s += '(UNKNOWN)'
+   return s
diff --git a/cumulus/src/plugins/core2chip/CoreToChip.py b/cumulus/src/plugins/core2chip/CoreToChip.py
index a87e1492..a4667b4b 100644
--- a/cumulus/src/plugins/core2chip/CoreToChip.py
+++ b/cumulus/src/plugins/core2chip/CoreToChip.py
@@ -20,6 +20,7 @@ from   Hurricane  import Net
 from   Hurricane  import Instance
 from   CRL        import Catalog
 from   CRL        import AllianceFramework
+from   helpers    import netDirectionToStr
 from   helpers.io import ErrorMessage
 
 
@@ -180,7 +181,8 @@ class CoreToChip ( object ):
     def _buildStandardPad ( self, ioNet ):
       if not self.ioPads.has_key(ioNet.coreNet.getDirection()):
         raise ErrorMessage( 1, 'CoreToChip._buildStandardPad(): Unsupported direction %d for core net "%s".' \
-                               % ioNet.coreNet.getName() )
+                               % (netDirectionToStr(ioNet.coreNet.getDirection())
+                                 ,ioNet.coreNet.getName()) )
 
       padInfo = self.ioPads[ ioNet.coreNet.getDirection() ]
 
diff --git a/hurricane/src/isobar/PyNetDirection.cpp b/hurricane/src/isobar/PyNetDirection.cpp
index b940bd7b..85468bcd 100644
--- a/hurricane/src/isobar/PyNetDirection.cpp
+++ b/hurricane/src/isobar/PyNetDirection.cpp
@@ -93,11 +93,18 @@ extern "C" {
   {
     PyObject* constant;
 
-    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::UNDEFINED,"UNDEFINED");
-    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::IN       ,"IN");
-    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::OUT      ,"OUT");
-    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::INOUT    ,"INOUT");
-    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::TRISTATE ,"TRISTATE");
+    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::DirIn       ,"DirIn"       );
+    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::DirOut      ,"DirOut"      );
+    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::ConnTristate,"ConnTristate");
+    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::ConnWiredOr ,"ConnWiredOr" );
+    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::UNDEFINED   ,"UNDEFINED"   );
+    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::IN          ,"IN"          );
+    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::OUT         ,"OUT"         );
+    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::INOUT       ,"INOUT"       );
+    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::TRISTATE    ,"TRISTATE"    );
+    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::TRANSCV     ,"TRANSCV"     );
+    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::WOR_OUT     ,"WOR_OUT"     );
+    LoadObjectConstant(PyTypeNetDirection.tp_dict,Net::Direction::WOR_INOUT   ,"WOR_INOUT"   );
   }