diff options
Diffstat (limited to 'gr-sounder/src/fpga/lib/sounder_rx.v')
| -rw-r--r-- | gr-sounder/src/fpga/lib/sounder_rx.v | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/gr-sounder/src/fpga/lib/sounder_rx.v b/gr-sounder/src/fpga/lib/sounder_rx.v deleted file mode 100644 index 18038a3a1..000000000 --- a/gr-sounder/src/fpga/lib/sounder_rx.v +++ /dev/null @@ -1,83 +0,0 @@ -// -*- 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 sounder_rx(clk_i,rst_i,ena_i,sum_strobe_i,ref_strobe_i, - mask_i,degree_i,rx_in_i_i,rx_in_q_i,rx_i_o,rx_q_o); - - input clk_i; // Master clock - input rst_i; // Subsystem reset - input ena_i; // Subsystem enable - input sum_strobe_i; // Strobe on last sample per period - input ref_strobe_i; // PN code reference retarded one sample per period - - input [15:0] mask_i; // PN code LFSR mask - input [4:0] degree_i; // PN code LFSR sequency degree - - input [15:0] rx_in_i_i; // I channel on receive - input [15:0] rx_in_q_i; // Q channel on receive - - output [15:0] rx_i_o; // I channel of impulse response - output [15:0] rx_q_o; // Q channel of impulse response - - reg [31:0] sum_i, sum_q; - reg [31:0] total_i, total_q; - wire [31:0] i_ext, q_ext; - - sign_extend #(16,32) i_extender(rx_in_i_i, i_ext); - sign_extend #(16,32) q_extender(rx_in_q_i, q_ext); - - wire pn_ref; - lfsr ref_code - ( .clk_i(clk_i),.rst_i(rst_i),.ena_i(ena_i),.strobe_i(ref_strobe_i),.mask_i(mask_i),.pn_o(pn_ref) ); - - wire [31:0] prod_i = pn_ref ? i_ext : -i_ext; - wire [31:0] prod_q = pn_ref ? q_ext : -q_ext; - - always @(posedge clk_i) - if (rst_i | ~ena_i) - begin - sum_i <= #5 0; - sum_q <= #5 0; - total_i <= #5 0; - total_q <= #5 0; - end - else - if (sum_strobe_i) - begin - total_i <= #5 sum_i; - total_q <= #5 sum_q; - sum_i <= #5 prod_i; - sum_q <= #5 prod_q; - end - else - begin - sum_i <= #5 sum_i + prod_i; - sum_q <= #5 sum_q + prod_q; - end - - wire [5:0] offset = (5'd16-degree_i); - wire [31:0] scaled_i = total_i << offset; - wire [31:0] scaled_q = total_q << offset; - assign rx_i_o = scaled_i[31:16]; - assign rx_q_o = scaled_q[31:16]; - -endmodule // sounder_rx - |