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7cc204bf 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
fa57f6e1 13// iZsh <izsh at fail0verflow.com>, June 2014
7cc204bf 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"
1d0ccbe0 20`include "hi_sniffer.v"
7cc204bf 21`include "util.v"
22
23module 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
41reg [15:0] shift_reg;
42reg [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.
47always @(posedge ncs)
48begin
49 case(shift_reg[15:12])
50 4'b0001: conf_word <= shift_reg[7:0]; // FPGA_CMD_SET_CONFREG
51 endcase
52end
53
54always @(posedge spck)
55begin
56 if(~ncs)
57 begin
58 shift_reg[15:1] <= shift_reg[14:0];
59 shift_reg[0] <= mosi;
60 end
61end
62
63wire [2:0] major_mode;
64assign 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)
69wire hi_read_tx_shallow_modulation = conf_word[0];
70
71// For the high-frequency receive correlator: frequency against which to
72// correlate.
73wire hi_read_rx_xcorr_848 = conf_word[0];
74// and whether to drive the coil (reader) or just short it (snooper)
75wire hi_read_rx_xcorr_snoop = conf_word[1];
76
7cc204bf 77// For the high-frequency simulated tag: what kind of modulation to use.
78wire [2:0] hi_simulate_mod_type = conf_word[2:0];
79
80//-----------------------------------------------------------------------------
81// And then we instantiate the modules corresponding to each of the FPGA's
82// major modes, and use muxes to connect the outputs of the active mode to
83// the output pins.
84//-----------------------------------------------------------------------------
85
86hi_read_tx ht(
87 pck0, ck_1356meg, ck_1356megb,
88 ht_pwr_lo, ht_pwr_hi, ht_pwr_oe1, ht_pwr_oe2, ht_pwr_oe3, ht_pwr_oe4,
89 adc_d, ht_adc_clk,
90 ht_ssp_frame, ht_ssp_din, ssp_dout, ht_ssp_clk,
91 cross_hi, cross_lo,
92 ht_dbg,
93 hi_read_tx_shallow_modulation
94);
95
96hi_read_rx_xcorr hrxc(
97 pck0, ck_1356meg, ck_1356megb,
98 hrxc_pwr_lo, hrxc_pwr_hi, hrxc_pwr_oe1, hrxc_pwr_oe2, hrxc_pwr_oe3, hrxc_pwr_oe4,
99 adc_d, hrxc_adc_clk,
100 hrxc_ssp_frame, hrxc_ssp_din, ssp_dout, hrxc_ssp_clk,
101 cross_hi, cross_lo,
102 hrxc_dbg,
22e24700 103 hi_read_rx_xcorr_848, hi_read_rx_xcorr_snoop
7cc204bf 104);
105
106hi_simulate hs(
107 pck0, ck_1356meg, ck_1356megb,
108 hs_pwr_lo, hs_pwr_hi, hs_pwr_oe1, hs_pwr_oe2, hs_pwr_oe3, hs_pwr_oe4,
109 adc_d, hs_adc_clk,
110 hs_ssp_frame, hs_ssp_din, ssp_dout, hs_ssp_clk,
111 cross_hi, cross_lo,
112 hs_dbg,
113 hi_simulate_mod_type
114);
115
116hi_iso14443a hisn(
117 pck0, ck_1356meg, ck_1356megb,
118 hisn_pwr_lo, hisn_pwr_hi, hisn_pwr_oe1, hisn_pwr_oe2, hisn_pwr_oe3, hisn_pwr_oe4,
119 adc_d, hisn_adc_clk,
120 hisn_ssp_frame, hisn_ssp_din, ssp_dout, hisn_ssp_clk,
121 cross_hi, cross_lo,
122 hisn_dbg,
123 hi_simulate_mod_type
124);
125
1d0ccbe0 126hi_sniffer he(
127 pck0, ck_1356meg, ck_1356megb,
128 he_pwr_lo, he_pwr_hi, he_pwr_oe1, he_pwr_oe2, he_pwr_oe3, he_pwr_oe4,
129 adc_d, he_adc_clk,
130 he_ssp_frame, he_ssp_din, ssp_dout, he_ssp_clk,
131 cross_hi, cross_lo,
132 he_dbg,
133 hi_read_rx_xcorr_848, hi_read_rx_xcorr_snoop, hi_read_rx_xcorr_quarter
134);
135
7cc204bf 136// Major modes:
137
138// 000 -- HF reader, transmitting to tag; modulation depth selectable
139// 001 -- HF reader, receiving from tag, correlating as it goes; frequency selectable
140// 010 -- HF simulated tag
141// 011 -- HF ISO14443-A
1d0ccbe0 142// 100 -- HF Snoop
7cc204bf 143// 111 -- everything off
144
1d0ccbe0 145mux8 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);
146mux8 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);
147mux8 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);
148mux8 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);
149mux8 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);
150mux8 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);
151mux8 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);
152mux8 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);
153mux8 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);
154mux8 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);
155mux8 mux_dbg (major_mode, dbg, ht_dbg, hrxc_dbg, hs_dbg, hisn_dbg, he_dbg, 1'b0, 1'b0, 1'b0);
7cc204bf 156
157// In all modes, let the ADC's outputs be enabled.
158assign adc_noe = 1'b0;
159
160endmodule
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