fpga/lo_passthru.v

   1 //-----------------------------------------------------------------------------
   2 // Copyright (C) Proxmark3 contributors. See AUTHORS.md for details.
   3 //
   4 // This program is free software: you can redistribute it and/or modify
   5 // it under the terms of the GNU General Public License as published by
   6 // the Free Software Foundation, either version 3 of the License, or
   7 // (at your option) any later version.
   8 //
   9 // This program is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // See LICENSE.txt for the text of the license.
  15 //-----------------------------------------------------------------------------
  16 //
  17 // For reading TI tags, we need to place the FPGA in pass through mode
  18 // and pass everything through to the ARM
  19
  20 module lo_passthru(
  21     input pck_divclk,
  22     input cross_lo,
  23     input ssp_dout,
  24
  25     output ssp_din,
  26     output adc_clk,
  27     output pwr_lo,
  28     output pwr_hi,
  29     output pwr_oe1,
  30     output pwr_oe2,
  31     output pwr_oe3,
  32     output pwr_oe4,
  33     output debug
  34 );
  35
  36 // the antenna is modulated when ssp_dout = 1, when 0 the
  37 // antenna drivers stop modulating and go into listen mode
  38 assign ssp_din = cross_lo;
  39 assign adc_clk = 1'b0;
  40 assign pwr_lo  = pck_divclk && ssp_dout;
  41 assign pwr_hi  = 1'b0;
  42 assign pwr_oe1 = ssp_dout;
  43 assign pwr_oe2 = ssp_dout;
  44 assign pwr_oe3 = 1'b0;
  45 assign pwr_oe4 = ssp_dout;
  46 assign debug   = cross_lo;
  47
  48 endmodule