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// -*- 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
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