git.zerfleddert.de Git - proxmark3-svn/blob - fpga/fpga_hf.v

   1 //-----------------------------------------------------------------------------
   2 // The FPGA is responsible for interfacing between the A/D, the coil drivers,
   3 // and the ARM. In the low-frequency modes it passes the data straight
   4 // through, so that the ARM gets raw A/D samples over the SSP. In the high-
   5 // frequency modes, the FPGA might perform some demodulation first, to
   6 // reduce the amount of data that we must send to the ARM.
   7 //
   8 // I am not really an FPGA/ASIC designer, so I am sure that a lot of this
   9 // could be improved.
  10 //
  11 // Jonathan Westhues, March 2006
  12 // Added ISO14443-A support by Gerhard de Koning Gans, April 2008
  13 // iZsh <izsh at fail0verflow.com>, June 2014
  14 //-----------------------------------------------------------------------------
  15
  16 `include "hi_read_tx.v"
  17 `include "hi_read_rx_xcorr.v"
  18 `include "hi_simulate.v"
  19 `include "hi_iso14443a.v"
  20 `include "hi_sniffer.v"
  21 `include "util.v"
  22
  23 module fpga_hf(
  24         input spck, output miso, input mosi, input ncs,
  25         input pck0, input ck_1356meg, input ck_1356megb,
  26         output pwr_lo, output pwr_hi,
  27         output pwr_oe1, output pwr_oe2, output pwr_oe3, output pwr_oe4,
  28         input [7:0] adc_d, output adc_clk, output adc_noe,
  29         output ssp_frame, output ssp_din, input ssp_dout, output ssp_clk,
  30         input cross_hi, input cross_lo,
  31         output dbg
  32 );
  33
  34 //-----------------------------------------------------------------------------
  35 // The SPI receiver. This sets up the configuration word, which the rest of
  36 // the logic looks at to determine how to connect the A/D and the coil
  37 // drivers (i.e., which section gets it). Also assign some symbolic names
  38 // to the configuration bits, for use below.
  39 //-----------------------------------------------------------------------------
  40
  41 reg [15:0] shift_reg;
  42 reg [7:0] conf_word;
  43
  44 // We switch modes between transmitting to the 13.56 MHz tag and receiving
  45 // from it, which means that we must make sure that we can do so without
  46 // glitching, or else we will glitch the transmitted carrier.
  47 always @(posedge ncs)
  48 begin
  49         case(shift_reg[15:12])
  50                 4'b0001: conf_word <= shift_reg[7:0];           // FPGA_CMD_SET_CONFREG
  51         endcase
  52 end
  53
  54 always @(posedge spck)
  55 begin
  56         if(~ncs)
  57         begin
  58                 shift_reg[15:1] <= shift_reg[14:0];
  59                 shift_reg[0] <= mosi;
  60         end
  61 end
  62
  63 wire [2:0] major_mode;
  64 assign major_mode = conf_word[7:5];
  65
  66 // For the high-frequency transmit configuration: modulation depth, either
  67 // 100% (just quite driving antenna, steady LOW), or shallower (tri-state
  68 // some fraction of the buffers)
  69 wire hi_read_tx_shallow_modulation = conf_word[0];
  70
  71 // For the high-frequency receive correlator: frequency against which to
  72 // correlate.
  73 wire hi_read_rx_xcorr_848 = conf_word[0];
  74 // and whether to drive the coil (reader) or just short it (snooper)
  75 wire hi_read_rx_xcorr_snoop = conf_word[1];
  76 // divide subcarrier frequency by 4
  77 wire hi_read_rx_xcorr_quarter = conf_word[2];
  78 // send amplitude only instead of ci/cq pair
  79 wire hi_read_rx_xcorr_amplitude = conf_word[3];
  80
  81 // For the high-frequency simulated tag: what kind of modulation to use.
  82 wire [2:0] hi_simulate_mod_type = conf_word[2:0];
  83
  84 //-----------------------------------------------------------------------------
  85 // And then we instantiate the modules corresponding to each of the FPGA's
  86 // major modes, and use muxes to connect the outputs of the active mode to
  87 // the output pins.
  88 //-----------------------------------------------------------------------------
  89
  90 hi_read_tx ht(
  91         pck0, ck_1356meg, ck_1356megb,
  92         ht_pwr_lo, ht_pwr_hi, ht_pwr_oe1, ht_pwr_oe2, ht_pwr_oe3, ht_pwr_oe4,
  93         adc_d, ht_adc_clk,
  94         ht_ssp_frame, ht_ssp_din, ssp_dout, ht_ssp_clk,
  95         cross_hi, cross_lo,
  96         ht_dbg,
  97         hi_read_tx_shallow_modulation
  98 );
  99
 100 hi_read_rx_xcorr hrxc(
 101         pck0, ck_1356meg, ck_1356megb,
 102         hrxc_pwr_lo, hrxc_pwr_hi, hrxc_pwr_oe1, hrxc_pwr_oe2, hrxc_pwr_oe3,     hrxc_pwr_oe4,
 103         adc_d, hrxc_adc_clk,
 104         hrxc_ssp_frame, hrxc_ssp_din, ssp_dout, hrxc_ssp_clk,
 105         cross_hi, cross_lo,
 106         hrxc_dbg,
 107         hi_read_rx_xcorr_848, hi_read_rx_xcorr_snoop, hi_read_rx_xcorr_quarter, hi_read_rx_xcorr_amplitude
 108 );
 109
 110 hi_simulate hs(
 111         pck0, ck_1356meg, ck_1356megb,
 112         hs_pwr_lo, hs_pwr_hi, hs_pwr_oe1, hs_pwr_oe2, hs_pwr_oe3, hs_pwr_oe4,
 113         adc_d, hs_adc_clk,
 114         hs_ssp_frame, hs_ssp_din, ssp_dout, hs_ssp_clk,
 115         cross_hi, cross_lo,
 116         hs_dbg,
 117         hi_simulate_mod_type
 118 );
 119
 120 hi_iso14443a hisn(
 121         pck0, ck_1356meg, ck_1356megb,
 122         hisn_pwr_lo, hisn_pwr_hi, hisn_pwr_oe1, hisn_pwr_oe2, hisn_pwr_oe3,     hisn_pwr_oe4,
 123         adc_d, hisn_adc_clk,
 124         hisn_ssp_frame, hisn_ssp_din, ssp_dout, hisn_ssp_clk,
 125         cross_hi, cross_lo,
 126         hisn_dbg,
 127         hi_simulate_mod_type
 128 );
 129
 130 hi_sniffer he(
 131        pck0, ck_1356meg, ck_1356megb,
 132        he_pwr_lo, he_pwr_hi, he_pwr_oe1, he_pwr_oe2, he_pwr_oe3,       he_pwr_oe4,
 133        adc_d, he_adc_clk,
 134        he_ssp_frame, he_ssp_din, ssp_dout, he_ssp_clk,
 135        cross_hi, cross_lo,
 136        he_dbg,
 137        hi_read_rx_xcorr_848, hi_read_rx_xcorr_snoop, hi_read_rx_xcorr_quarter
 138 );
 139
 140 // Major modes:
 141
 142 //   000 --  HF reader, transmitting to tag; modulation depth selectable
 143 //   001 --  HF reader, receiving from tag, correlating as it goes; frequency selectable
 144 //   010 --  HF simulated tag
 145 //   011 --  HF ISO14443-A
 146 //   100 --  HF Snoop
 147 //   111 --  everything off
 148
 149 mux8 mux_ssp_clk                (major_mode, ssp_clk,   ht_ssp_clk,   hrxc_ssp_clk,   hs_ssp_clk,   hisn_ssp_clk,   he_ssp_clk, 1'b0, 1'b0, 1'b0);
 150 mux8 mux_ssp_din                (major_mode, ssp_din,   ht_ssp_din,   hrxc_ssp_din,   hs_ssp_din,   hisn_ssp_din,   he_ssp_din, 1'b0, 1'b0, 1'b0);
 151 mux8 mux_ssp_frame              (major_mode, ssp_frame, ht_ssp_frame, hrxc_ssp_frame, hs_ssp_frame, hisn_ssp_frame, he_ssp_frame, 1'b0, 1'b0, 1'b0);
 152 mux8 mux_pwr_oe1                (major_mode, pwr_oe1,   ht_pwr_oe1,   hrxc_pwr_oe1,   hs_pwr_oe1,   hisn_pwr_oe1,   he_pwr_oe1, 1'b0, 1'b0, 1'b0);
 153 mux8 mux_pwr_oe2                (major_mode, pwr_oe2,   ht_pwr_oe2,   hrxc_pwr_oe2,   hs_pwr_oe2,   hisn_pwr_oe2,   he_pwr_oe2, 1'b0, 1'b0, 1'b0);
 154 mux8 mux_pwr_oe3                (major_mode, pwr_oe3,   ht_pwr_oe3,   hrxc_pwr_oe3,   hs_pwr_oe3,   hisn_pwr_oe3,   he_pwr_oe3, 1'b0, 1'b0, 1'b0);
 155 mux8 mux_pwr_oe4                (major_mode, pwr_oe4,   ht_pwr_oe4,   hrxc_pwr_oe4,   hs_pwr_oe4,   hisn_pwr_oe4,   he_pwr_oe4, 1'b0, 1'b0, 1'b0);
 156 mux8 mux_pwr_lo                 (major_mode, pwr_lo,    ht_pwr_lo,    hrxc_pwr_lo,    hs_pwr_lo,    hisn_pwr_lo,    he_pwr_lo, 1'b0, 1'b0, 1'b0);
 157 mux8 mux_pwr_hi                 (major_mode, pwr_hi,    ht_pwr_hi,    hrxc_pwr_hi,    hs_pwr_hi,    hisn_pwr_hi,    he_pwr_hi, 1'b0, 1'b0, 1'b0);
 158 mux8 mux_adc_clk                (major_mode, adc_clk,   ht_adc_clk,   hrxc_adc_clk,   hs_adc_clk,   hisn_adc_clk,   he_adc_clk, 1'b0, 1'b0, 1'b0);
 159 mux8 mux_dbg                    (major_mode, dbg,       ht_dbg,       hrxc_dbg,       hs_dbg,       hisn_dbg,       he_dbg, 1'b0, 1'b0, 1'b0);
 160
 161 // In all modes, let the ADC's outputs be enabled.
 162 assign adc_noe = 1'b0;
 163
 164 endmodule