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diff --git a/host/lib/usrp/usrp_e100/clock_ctrl.hpp b/host/lib/usrp/usrp_e100/clock_ctrl.hpp
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+++ b/host/lib/usrp/usrp_e100/clock_ctrl.hpp
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+//
+// Copyright 2010 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#ifndef INCLUDED_USRP_E100_CLOCK_CTRL_HPP
+#define INCLUDED_USRP_E100_CLOCK_CTRL_HPP
+
+#include "usrp_e100_iface.hpp"
+#include <boost/shared_ptr.hpp>
+#include <boost/utility.hpp>
+#include <vector>
+
+/*!
+ * The usrp-e clock control:
+ * - Setup system clocks.
+ * - Disable/enable clock lines.
+ */
+class usrp_e100_clock_ctrl : boost::noncopyable{
+public:
+    typedef boost::shared_ptr<usrp_e100_clock_ctrl> sptr;
+
+    /*!
+     * Make a new clock control object.
+     * \param iface the usrp_e100 iface object
+     * \return the clock control object
+     */
+    static sptr make(usrp_e100_iface::sptr iface);
+
+    /*!
+     * Get the rate of the fpga clock line.
+     * \return the fpga clock rate in Hz
+     */
+    virtual double get_fpga_clock_rate(void) = 0;
+
+    /*!
+     * Get the possible rates of the rx dboard clock.
+     * \return a vector of clock rates in Hz
+     */
+    virtual std::vector<double> get_rx_dboard_clock_rates(void) = 0;
+
+    /*!
+     * Get the possible rates of the tx dboard clock.
+     * \return a vector of clock rates in Hz
+     */
+    virtual std::vector<double> get_tx_dboard_clock_rates(void) = 0;
+
+    /*!
+     * Set the rx dboard clock rate to a possible rate.
+     * \param rate the new clock rate in Hz
+     * \throw exception when rate cannot be achieved
+     */
+    virtual void set_rx_dboard_clock_rate(double rate) = 0;
+
+    /*!
+     * Set the tx dboard clock rate to a possible rate.
+     * \param rate the new clock rate in Hz
+     * \throw exception when rate cannot be achieved
+     */
+    virtual void set_tx_dboard_clock_rate(double rate) = 0;
+
+    /*!
+     * Enable/disable the rx dboard clock.
+     * \param enb true to enable
+     */
+    virtual void enable_rx_dboard_clock(bool enb) = 0;
+
+    /*!
+     * Enable/disable the tx dboard clock.
+     * \param enb true to enable
+     */
+    virtual void enable_tx_dboard_clock(bool enb) = 0;
+
+};
+
+#endif /* INCLUDED_USRP_E100_CLOCK_CTRL_HPP */