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diff --git a/src/mem/ruby/network/garnet-fixed-pipeline/RoutingUnit_d.cc b/src/mem/ruby/network/garnet-fixed-pipeline/RoutingUnit_d.cc
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+/*
+ * Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Routingunit_d.C
+ *
+ * Niket Agarwal, Princeton University
+ *
+ * */
+
+#include "RoutingUnit_d.hh"
+#include "Router_d.hh"
+#include "InputUnit_d.hh"
+#include "NetworkMessage.hh"
+
+RoutingUnit_d::RoutingUnit_d(Router_d *router)
+{
+        m_router = router;
+        m_routing_table.clear();
+        m_weight_table.clear();
+}
+
+void RoutingUnit_d::addRoute(const NetDest& routing_table_entry)
+{
+        m_routing_table.insertAtBottom(routing_table_entry);
+}
+
+void RoutingUnit_d::addWeight(int link_weight)
+{
+        m_weight_table.insertAtBottom(link_weight);
+}
+
+void RoutingUnit_d::RC_stage(flit_d *t_flit, InputUnit_d *in_unit, int invc)
+{
+        int outport = routeCompute(t_flit);
+        in_unit->updateRoute(invc, outport);
+        t_flit->advance_stage(VA_);
+        m_router->vcarb_req();
+}
+
+int RoutingUnit_d::routeCompute(flit_d *t_flit)
+{
+        MsgPtr msg_ptr = t_flit->get_msg_ptr();
+        NetworkMessage* net_msg_ptr = NULL;
+        net_msg_ptr = dynamic_cast<NetworkMessage*>(msg_ptr.ref());
+        NetDest msg_destination = net_msg_ptr->getInternalDestination();
+
+        int output_link = -1;
+        int min_weight = INFINITE_;
+
+        for(int link = 0; link < m_routing_table.size(); link++)
+        {
+                if (msg_destination.intersectionIsNotEmpty(m_routing_table[link]))
+                {
+                        if(m_weight_table[link] >= min_weight)
+                                continue;
+                        output_link = link;
+                        min_weight = m_weight_table[link];
+                }
+        }
+        if(output_link == -1)
+        {
+                ERROR_MSG("Fatal Error:: No Route exists from this Router.");
+                exit(0);
+        }
+        return output_link;
+
+}