Imported Upstream version 3.2.2

[debian/gnuradio] / gr-radar-mono / src / fpga / lib / cordic_nco.v

diff --git a/gr-radar-mono/src/fpga/lib/cordic_nco.v b/gr-radar-mono/src/fpga/lib/cordic_nco.v
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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