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diff --git a/src/mem/ruby/network/garnet2.0/flitBuffer.hh b/src/mem/ruby/network/garnet2.0/flitBuffer.hh
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+/*
+ * Copyright (c) 2008 Princeton University
+ * Copyright (c) 2016 Georgia Institute of Technology
+ * 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: Niket Agarwal
+ *          Tushar Krishna
+ */
+
+
+#ifndef __MEM_RUBY_NETWORK_GARNET_FLIT_BUFFER_HH__
+#define __MEM_RUBY_NETWORK_GARNET_FLIT_BUFFER_HH__
+
+#include <algorithm>
+#include <iostream>
+#include <vector>
+
+#include "mem/ruby/network/garnet2.0/CommonTypes.hh"
+#include "mem/ruby/network/garnet2.0/flit.hh"
+
+class flitBuffer
+{
+  public:
+    flitBuffer();
+    flitBuffer(int maximum_size);
+
+    bool isReady(Cycles curTime);
+    bool isEmpty();
+    void print(std::ostream& out) const;
+    bool isFull();
+    void setMaxSize(int maximum);
+
+    flit *
+    getTopFlit()
+    {
+        flit *f = m_buffer.front();
+        std::pop_heap(m_buffer.begin(), m_buffer.end(), flit::greater);
+        m_buffer.pop_back();
+        return f;
+    }
+
+    flit *
+    peekTopFlit()
+    {
+        return m_buffer.front();
+    }
+
+    void
+    insert(flit *flt)
+    {
+        m_buffer.push_back(flt);
+        std::push_heap(m_buffer.begin(), m_buffer.end(), flit::greater);
+    }
+
+    uint32_t functionalWrite(Packet *pkt);
+
+  private:
+    std::vector<flit *> m_buffer;
+    int max_size;
+};
+
+inline std::ostream&
+operator<<(std::ostream& out, const flitBuffer& obj)
+{
+    obj.print(out);
+    out << std::flush;
+    return out;
+}
+
+#endif // __MEM_RUBY_NETWORK_GARNET_FLIT_BUFFER_HH__