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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
//
module cordic_nco(clk_i,rst_i,ena_i,strobe_i,ampl_i,freq_i,phs_i,data_i_o,data_q_o);
input clk_i;
input rst_i;
input ena_i;
input strobe_i;
input [15:0] ampl_i;
input [31:0] freq_i;
input [31:0] phs_i;
output [15:0] data_i_o;
output [15:0] data_q_o;
reg [31:0] phase_reg;
wire [31:0] phase = phase_reg + phs_i;
wire [15:0] ampl;
always @(posedge clk_i)
begin
if (rst_i | ~ena_i)
phase_reg <= 32'b0;
else if (strobe_i)
phase_reg <= phase_reg + freq_i;
end
assign ampl = ena_i ? ampl_i : 16'b0;
cordic tx_cordic
(.clock(clk_i),.reset(rst_i),.enable(strobe_i),
.xi(ampl),.yi(16'b0),.zi(phase[31:16]),
.xo(data_i_o),.yo(data_q_o),.zo());
endmodule // cordic_nco
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