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diff --git a/src/mem/ruby/network/orion/Clock.hh b/src/mem/ruby/network/orion/Clock.hh
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+++ b/src/mem/ruby/network/orion/Clock.hh
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+/*
+ * Copyright (c) 2009 Princeton University, and 
+ *                    Regents of the University of California
+ * 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:  Hangsheng Wang (Orion 1.0, Princeton)
+ *           Xinping Zhu (Orion 1.0, Princeton)
+ *           Xuning Chen (Orion 1.0, Princeton)
+ *           Bin Li (Orion 2.0, Princeton)
+ *           Kambiz Samadi (Orion 2.0, UC San Diego)
+ */
+
+#ifndef __CLOCK_H__
+#define __CLOCK_H__
+
+#include "mem/ruby/network/orion/Type.hh"
+
+class TechParameter;
+class OrionConfig;
+
+class Clock
+{
+  public:
+    Clock(
+      bool is_in_buf_,
+      bool is_in_shared_switch_,
+      bool is_out_buf_,
+      bool is_out_shared_switch_,
+      const OrionConfig* orion_cfg_ptr_
+    );
+    ~Clock();
+
+  public:
+    double get_dynamic_energy() const;
+    double get_static_power() const;
+
+  private:
+    void init();
+    double calc_cap_pipe_reg();
+
+  private:
+    bool m_is_in_buf;
+    bool m_is_in_shared_switch;
+    bool m_is_out_buf;
+    bool m_is_out_shared_switch;
+    const OrionConfig* m_orion_cfg_ptr;
+    const TechParameter* m_tech_param_ptr;
+
+    double m_e_pipe_reg;
+    double m_e_htree;
+    double m_i_static;
+};
+
+#endif