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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_OUTPUT_UNIT_HH__
+#define __MEM_RUBY_NETWORK_GARNET_OUTPUT_UNIT_HH__
+
+#include <iostream>
+#include <vector>
+
+#include "mem/ruby/common/Consumer.hh"
+#include "mem/ruby/network/garnet2.0/CommonTypes.hh"
+#include "mem/ruby/network/garnet2.0/CreditLink.hh"
+#include "mem/ruby/network/garnet2.0/NetworkLink.hh"
+#include "mem/ruby/network/garnet2.0/OutVcState.hh"
+#include "mem/ruby/network/garnet2.0/Router.hh"
+#include "mem/ruby/network/garnet2.0/flitBuffer.hh"
+
+class OutputUnit : public Consumer
+{
+  public:
+    OutputUnit(int id, PortDirection direction, Router *router);
+    ~OutputUnit();
+    void set_out_link(NetworkLink *link);
+    void set_credit_link(CreditLink *credit_link);
+    void wakeup();
+    flitBuffer* getOutQueue();
+    void print(std::ostream& out) const {};
+    void decrement_credit(int out_vc);
+    void increment_credit(int out_vc);
+    bool has_credit(int out_vc);
+    bool has_free_vc(int vnet);
+    int select_free_vc(int vnet);
+
+    inline PortDirection get_direction() { return m_direction; }
+
+    int
+    get_credit_count(int vc)
+    {
+        return m_outvc_state[vc]->get_credit_count();
+    }
+
+    inline int
+    get_outlink_id()
+    {
+        return m_out_link->get_id();
+    }
+
+    inline void
+    set_vc_state(VC_state_type state, int vc, Cycles curTime)
+    {
+      m_outvc_state[vc]->setState(state, curTime);
+    }
+
+    inline bool
+    is_vc_idle(int vc, Cycles curTime)
+    {
+        return (m_outvc_state[vc]->isInState(IDLE_, curTime));
+    }
+
+    inline void
+    insert_flit(flit *t_flit)
+    {
+        m_out_buffer->insert(t_flit);
+        m_out_link->scheduleEventAbsolute(m_router->clockEdge(Cycles(1)));
+    }
+
+    uint32_t functionalWrite(Packet *pkt);
+
+  private:
+    int m_id;
+    PortDirection m_direction;
+    int m_num_vcs;
+    int m_vc_per_vnet;
+    Router *m_router;
+    NetworkLink *m_out_link;
+    CreditLink *m_credit_link;
+
+    flitBuffer *m_out_buffer; // This is for the network link to consume
+    std::vector<OutVcState *> m_outvc_state; // vc state of downstream router
+
+};
+
+#endif // __MEM_RUBY_NETWORK_GARNET_OUTPUT_UNIT_HH__