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adjust ask/biphase handling - more complete
[proxmark3-svn] / fpga / testbed_lo_read.v
1 `include "lo_read.v"
2 /*
3 pck0 - input main 24Mhz clock (PLL / 4)
4 [7:0] adc_d - input data from A/D converter
5 lo_is_125khz - input freq selector (1=125Khz, 0=136Khz)
6
7 pwr_lo - output to coil drivers (ssp_clk / 8)
8 adc_clk - output A/D clock signal
9 ssp_frame - output SSS frame indicator (goes high while the 8 bits are shifted)
10 ssp_din - output SSP data to ARM (shifts 8 bit A/D value serially to ARM MSB first)
11 ssp_clk - output SSP clock signal 1Mhz/1.09Mhz (pck0 / 2*(11+lo_is_125khz) )
12
13 ck_1356meg - input unused
14 ck_1356megb - input unused
15 ssp_dout - input unused
16 cross_hi - input unused
17 cross_lo - input unused
18
19 pwr_hi - output unused, tied low
20 pwr_oe1 - output unused, undefined
21 pwr_oe2 - output unused, undefined
22 pwr_oe3 - output unused, undefined
23 pwr_oe4 - output unused, undefined
24 dbg - output alias for adc_clk
25 */
26
27 module testbed_lo_read;
28 reg pck0;
29 reg [7:0] adc_d;
30 reg lo_is_125khz;
31 reg [15:0] divisor;
32
33 wire pwr_lo;
34 wire adc_clk;
35 wire ck_1356meg;
36 wire ck_1356megb;
37 wire ssp_frame;
38 wire ssp_din;
39 wire ssp_clk;
40 reg ssp_dout;
41 wire pwr_hi;
42 wire pwr_oe1;
43 wire pwr_oe2;
44 wire pwr_oe3;
45 wire pwr_oe4;
46 wire cross_lo;
47 wire cross_hi;
48 wire dbg;
49
50 lo_read #(5,10) dut(
51 .pck0(pck0),
52 .ck_1356meg(ck_1356meg),
53 .ck_1356megb(ck_1356megb),
54 .pwr_lo(pwr_lo),
55 .pwr_hi(pwr_hi),
56 .pwr_oe1(pwr_oe1),
57 .pwr_oe2(pwr_oe2),
58 .pwr_oe3(pwr_oe3),
59 .pwr_oe4(pwr_oe4),
60 .adc_d(adc_d),
61 .adc_clk(adc_clk),
62 .ssp_frame(ssp_frame),
63 .ssp_din(ssp_din),
64 .ssp_dout(ssp_dout),
65 .ssp_clk(ssp_clk),
66 .cross_hi(cross_hi),
67 .cross_lo(cross_lo),
68 .dbg(dbg),
69 .lo_is_125khz(lo_is_125khz),
70 .divisor(divisor)
71 );
72
73 integer idx, i, adc_val=8;
74
75 // main clock
76 always #5 pck0 = !pck0;
77
78 task crank_dut;
79 begin
80 @(posedge adc_clk) ;
81 adc_d = adc_val;
82 adc_val = (adc_val *2) + 53;
83 end
84 endtask
85
86 initial begin
87
88 // init inputs
89 pck0 = 0;
90 adc_d = 0;
91 ssp_dout = 0;
92 lo_is_125khz = 1;
93 divisor = 255; //min 16, 95=125Khz, max 255
94
95 // simulate 4 A/D cycles at 125Khz
96 for (i = 0 ; i < 8 ; i = i + 1) begin
97 crank_dut;
98 end
99 $finish;
100 end
101 endmodule // main
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