Merged r5033:5116 from developer branch jcorgan/snd, with minor edits. Trunk passes...

[debian/gnuradio] / gr-sounder / src / fpga / lib / sounder_tx.v

diff --git a/gr-sounder/src/fpga/lib/sounder_tx.v b/gr-sounder/src/fpga/lib/sounder_tx.v
new file mode 100644 (file)
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--- /dev/null
+++ b/gr-sounder/src/fpga/lib/sounder_tx.v
@@ -0,0 +1,45 @@
+// -*- 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"
+
+`define MAX_VALUE 16'h7FFF // 2s complement
+`define MIN_VALUE 16'h8000
+
+module sounder_tx(clk_i,rst_i,ena_i,strobe_i,mask_i,tx_i_o,tx_q_o);
+   input         clk_i;
+   input         rst_i;
+   input         ena_i;
+   input         strobe_i;
+   input  [15:0] mask_i;
+   output [15:0] tx_i_o;
+   output [15:0] tx_q_o;
+
+   wire          pn;
+
+   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 = pn ? `MAX_VALUE : `MIN_VALUE; // Bipolar
+   assign tx_q_o = 16'b0;
+
+endmodule // sounder_tx