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diff --git a/ext/mcpat/cacti/router.h b/ext/mcpat/cacti/router.h
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+/*****************************************************************************
+ *                                McPAT/CACTI
+ *                      SOFTWARE LICENSE AGREEMENT
+ *            Copyright 2012 Hewlett-Packard Development Company, L.P.
+ *                          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.”
+ *
+ ***************************************************************************/
+
+
+
+#ifndef __ROUTER_H__
+#define __ROUTER_H__
+
+#include <assert.h>
+
+#include <iostream>
+
+#include "arbiter.h"
+#include "basic_circuit.h"
+#include "cacti_interface.h"
+#include "component.h"
+#include "crossbar.h"
+#include "mat.h"
+#include "parameter.h"
+#include "wire.h"
+
+class Router : public Component
+{
+  public:
+    Router(
+        double flit_size_,
+        double vc_buf, /* vc size = vc_buffer_size * flit_size */
+        double vc_count,
+        TechnologyParameter::DeviceType *dt = &(g_tp.peri_global),
+        double I_ = 5,
+        double O_ = 5,
+        double M_ = 0.6);
+    ~Router();
+
+
+    void print_router();
+
+    Component arbiter, crossbar, buffer;
+
+    double cycle_time, max_cyc;
+    double flit_size;
+    double vc_count;
+    double vc_buffer_size; /* vc size = vc_buffer_size * flit_size */
+
+  private:
+        TechnologyParameter::DeviceType *deviceType;
+        double FREQUENCY; // move this to config file --TODO
+    double Cw3(double len);
+    double gate_cap(double w);
+    double diff_cap(double w, int type /*0 for n-mos and 1 for p-mos*/, double stack);
+    enum Wire_type wtype;
+    enum Wire_placement wire_placement;
+    //corssbar
+    double NTtr, PTtr, wt, ht, I, O, NTi, PTi, NTid, PTid, NTod, PTod, TriS1, TriS2;
+    double M; //network load
+    double transmission_buf_inpcap();
+    double transmission_buf_outcap();
+    double transmission_buf_ctrcap();
+    double crossbar_inpline();
+    double crossbar_outline();
+    double crossbar_ctrline();
+    double tr_crossbar_power();
+    void  cb_stats ();
+    double arb_power();
+    void  arb_stats ();
+    double buffer_params();
+    void buffer_stats();
+
+
+    //arbiter
+
+    //buffer
+
+    //router params
+    double Vdd;
+
+    void calc_router_parameters();
+    void get_router_area();
+    void get_router_power();
+    void get_router_delay();
+
+    double min_w_pmos;
+
+
+};
+
+#endif