diff options
Diffstat (limited to 'gr-sounder/src/fpga/lib/lfsr_constants.v')
| -rwxr-xr-x | gr-sounder/src/fpga/lib/lfsr_constants.v | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/gr-sounder/src/fpga/lib/lfsr_constants.v b/gr-sounder/src/fpga/lib/lfsr_constants.v new file mode 100755 index 0000000000..79fcb1a2b7 --- /dev/null +++ b/gr-sounder/src/fpga/lib/lfsr_constants.v @@ -0,0 +1,51 @@ +// -*- 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 lfsr_constants(degree_i,mask_o,len_o); + input wire [4:0] degree_i; + output reg [15:0] mask_o; + output wire [15:0] len_o; + + assign len_o = (16'b1 << degree_i) - 1; + + always @* + case (degree_i) + 5'd00: mask_o = 16'h0000; + 5'd01: mask_o = 16'h0001; + 5'd02: mask_o = 16'h0003; + 5'd03: mask_o = 16'h0005; + 5'd04: mask_o = 16'h0009; + 5'd05: mask_o = 16'h0012; + 5'd06: mask_o = 16'h0021; + 5'd07: mask_o = 16'h0041; + 5'd08: mask_o = 16'h008E; + 5'd09: mask_o = 16'h0108; + 5'd10: mask_o = 16'h0204; + 5'd11: mask_o = 16'h0402; + 5'd12: mask_o = 16'h0829; + 5'd13: mask_o = 16'h100D; + 5'd14: mask_o = 16'h2015; + 5'd15: mask_o = 16'h4001; + 5'd16: mask_o = 16'h8016; + default: mask_o = 16'h0000; + endcase // case(degree_i) + +endmodule // lfsr_constants |