// -*- 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