--- /dev/null
+// -*- verilog -*-
+//
+// USRP - Universal Software Radio Peripheral
+//
+// Copyright (C) 2007 Corgan Enterprises 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 2 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, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Boston, MA 02110-1301 USA
+//
+
+`include "../../../../usrp/firmware/include/fpga_regs_common.v"
+`include "../../../../usrp/firmware/include/fpga_regs_standard.v"
+
+module sounder_tx(clk_i,rst_i,ena_i,strobe_i,ampl_i,mask_i,tx_i_o,tx_q_o);
+ input clk_i;
+ input rst_i;
+ input ena_i;
+ input strobe_i;
+ input [13:0] ampl_i;
+ input [15:0] mask_i;
+ output [13:0] tx_i_o;
+ output [13:0] tx_q_o;
+
+ wire pn;
+ wire [13:0] min_value = (~ampl_i)+14'b1;
+
+ lfsr pn_code
+ ( .clk_i(clk_i),.rst_i(rst_i),.ena_i(ena_i),.strobe_i(strobe_i),.mask_i(mask_i),.pn_o(pn) );
+
+ assign tx_i_o = ena_i ? (pn ? ampl_i : min_value) : 14'b0; // Bipolar
+ assign tx_q_o = 14'b0;
+
+endmodule // sounder_tx