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[proxmark3-svn] / fpga / hi_sniffer.v
1 module hi_sniffer(
2 pck0, ck_1356meg, ck_1356megb,
3 pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4,
4 adc_d, adc_clk,
5 ssp_frame, ssp_din, ssp_dout, ssp_clk,
6 cross_hi, cross_lo,
7 dbg,
8 xcorr_is_848, snoop, xcorr_quarter_freq // not used.
9 );
10 input pck0, ck_1356meg, ck_1356megb;
11 output pwr_lo, pwr_hi, pwr_oe1, pwr_oe2, pwr_oe3, pwr_oe4;
12 input [7:0] adc_d;
13 output adc_clk;
14 input ssp_dout;
15 output ssp_frame, ssp_din, ssp_clk;
16 input cross_hi, cross_lo;
17 output dbg;
18 input xcorr_is_848, snoop, xcorr_quarter_freq; // not used.
19
20 // We are only snooping, all off.
21 assign pwr_hi = 1'b0;
22 assign pwr_lo = 1'b0;
23 assign pwr_oe1 = 1'b0;
24 assign pwr_oe2 = 1'b0;
25 assign pwr_oe3 = 1'b0;
26 assign pwr_oe4 = 1'b0;
27
28 reg ssp_frame;
29 reg [7:0] adc_d_out = 8'd0;
30 reg [2:0] ssp_cnt = 3'd0;
31
32 assign adc_clk = ck_1356meg;
33 assign ssp_clk = ~ck_1356meg;
34
35 always @(posedge ssp_clk)
36 begin
37 if(ssp_cnt[2:0] == 3'd7)
38 ssp_cnt[2:0] <= 3'd0;
39 else
40 ssp_cnt <= ssp_cnt + 1;
41
42 if(ssp_cnt[2:0] == 3'b000) // set frame length
43 begin
44 adc_d_out[7:0] <= adc_d;
45 ssp_frame <= 1'b1;
46 end
47 else
48 begin
49 adc_d_out[7:0] <= {1'b0, adc_d_out[7:1]};
50 ssp_frame <= 1'b0;
51 end
52
53 end
54
55 assign ssp_din = adc_d_out[0];
56
57 endmodule
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