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diff --git a/src/mem/ruby/network/garnet2.0/GarnetLink.py b/src/mem/ruby/network/garnet2.0/GarnetLink.py
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+++ b/src/mem/ruby/network/garnet2.0/GarnetLink.py
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+# Copyright (c) 2008 Princeton University
+# Copyright (c) 2009 Advanced Micro Devices, Inc.
+# 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.
+#
+# Authors: Steve Reinhardt
+#          Brad Beckmann
+
+from m5.params import *
+from m5.proxy import *
+from ClockedObject import ClockedObject
+from BasicLink import BasicIntLink, BasicExtLink
+
+class NetworkLink(ClockedObject):
+    type = 'NetworkLink'
+    cxx_header = "mem/ruby/network/garnet2.0/NetworkLink.hh"
+    link_id = Param.Int(Parent.link_id, "link id")
+    link_latency = Param.Cycles(Parent.latency, "link latency")
+    vcs_per_vnet = Param.Int(Parent.vcs_per_vnet,
+                              "virtual channels per virtual network")
+    virt_nets = Param.Int(Parent.number_of_virtual_networks,
+                          "number of virtual networks")
+
+class CreditLink(NetworkLink):
+    type = 'CreditLink'
+    cxx_header = "mem/ruby/network/garnet2.0/CreditLink.hh"
+
+# Interior fixed pipeline links between routers
+class GarnetIntLink(BasicIntLink):
+    type = 'GarnetIntLink'
+    cxx_header = "mem/ruby/network/garnet2.0/GarnetLink.hh"
+    # The internal link includes one forward link (for flit)
+    # and one backward flow-control link (for credit)
+    network_link = Param.NetworkLink(NetworkLink(), "forward link")
+    credit_link  = Param.CreditLink(CreditLink(), "backward flow-control link")
+
+# Exterior fixed pipeline links between a router and a controller
+class GarnetExtLink(BasicExtLink):
+    type = 'GarnetExtLink'
+    cxx_header = "mem/ruby/network/garnet2.0/GarnetLink.hh"
+    # The external link is bi-directional.
+    # It includes two forward links (for flits)
+    # and two backward flow-control links (for credits),
+    # one per direction
+    _nls = []
+    # In uni-directional link
+    _nls.append(NetworkLink());
+    # Out uni-directional link
+    _nls.append(NetworkLink());
+    network_links = VectorParam.NetworkLink(_nls, "forward links")
+
+    _cls = []
+    # In uni-directional link
+    _cls.append(CreditLink());
+    # Out uni-directional link
+    _cls.append(CreditLink());
+    credit_links = VectorParam.CreditLink(_cls, "backward flow-control links")