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fc52fbd4 1//-----------------------------------------------------------------------------
2//
3// piwi, Feb 2019
4//-----------------------------------------------------------------------------
5
6module hi_get_trace(
7 ck_1356megb,
8 adc_d, trace_enable, major_mode,
9 ssp_frame, ssp_din, ssp_clk
10);
11 input ck_1356megb;
12 input [7:0] adc_d;
13 input trace_enable;
14 input [2:0] major_mode;
15 output ssp_frame, ssp_din, ssp_clk;
16
fc52fbd4 17// clock divider
18reg [6:0] clock_cnt;
19always @(negedge ck_1356megb)
20begin
21 clock_cnt <= clock_cnt + 1;
22end
23
24// sample at 13,56MHz / 8. The highest signal frequency (subcarrier) is 848,5kHz, i.e. in this case we oversample by a factor of 2
25reg [2:0] sample_clock;
26always @(negedge ck_1356megb)
27begin
5ea2a248 28 if (sample_clock == 3'd7)
fc52fbd4 29 sample_clock <= 3'd0;
30 else
31 sample_clock <= sample_clock + 1;
32end
33
34
35reg [11:0] addr;
36reg [11:0] start_addr;
37reg [2:0] previous_major_mode;
38reg write_enable1;
39reg write_enable2;
40always @(negedge ck_1356megb)
41begin
42 previous_major_mode <= major_mode;
5ea2a248 43 if (major_mode == `FPGA_MAJOR_MODE_HF_GET_TRACE)
fc52fbd4 44 begin
45 write_enable1 <= 1'b0;
46 write_enable2 <= 1'b0;
5ea2a248 47 if (previous_major_mode != `FPGA_MAJOR_MODE_HF_GET_TRACE) // just switched into GET_TRACE mode
fc52fbd4 48 addr <= start_addr;
49 if (clock_cnt == 7'd0)
50 begin
51 if (addr == 12'd3071)
52 addr <= 12'd0;
53 else
54 addr <= addr + 1;
55 end
56 end
5ea2a248 57 else if (major_mode != `FPGA_MAJOR_MODE_OFF)
fc52fbd4 58 begin
59 if (trace_enable)
60 begin
61 if (addr[11] == 1'b0)
62 begin
63 write_enable1 <= 1'b1;
64 write_enable2 <= 1'b0;
65 end
66 else
67 begin
68 write_enable1 <= 1'b0;
69 write_enable2 <= 1'b1;
70 end
71 if (sample_clock == 3'b000)
72 begin
73 if (addr == 12'd3071)
74 begin
75 addr <= 12'd0;
76 write_enable1 <= 1'b1;
77 write_enable2 <= 1'b0;
78 end
79 else
80 addr <= addr + 1;
81 end
82 end
83 else
84 begin
85 write_enable1 <= 1'b0;
86 write_enable2 <= 1'b0;
87 start_addr <= addr;
88 end
89 end
5ea2a248 90 else // major_mode == `FPGA_MAJOR_MODE_OFF
fc52fbd4 91 begin
92 write_enable1 <= 1'b0;
93 write_enable2 <= 1'b0;
5ea2a248 94 if (previous_major_mode != `FPGA_MAJOR_MODE_OFF && previous_major_mode != `FPGA_MAJOR_MODE_HF_GET_TRACE) // just switched off
fc52fbd4 95 start_addr <= addr;
96 end
97end
98
99
100// (2+1)k RAM
101reg [7:0] D_out1, D_out2;
102reg [7:0] ram1 [2047:0];
103reg [7:0] ram2 [1023:0];
104
105always @(negedge ck_1356megb)
106begin
107 if (write_enable1)
108 begin
109 ram1[addr[10:0]] <= adc_d;
110 D_out1 <= adc_d;
111 end
112 else
113 D_out1 <= ram1[addr[10:0]];
114 if (write_enable2)
115 begin
116 ram2[addr[9:0]] <= adc_d;
117 D_out2 <= adc_d;
118 end
119 else
120 D_out2 <= ram2[addr[9:0]];
121end
122
123
124// SSC communication to ARM
125reg ssp_clk;
126reg ssp_frame;
127reg [7:0] shift_out;
128
129always @(negedge ck_1356megb)
130begin
131 if(clock_cnt[3:0] == 4'd0) // update shift register every 16 clock cycles
132 begin
133 if(clock_cnt[6:4] == 3'd0) // either load new value
134 begin
135 if (addr[11] == 1'b0)
136 shift_out <= D_out1;
137 else
138 shift_out <= D_out2;
139 end
140 else // or shift left
141 shift_out[7:1] <= shift_out[6:0];
142 end
143
144 ssp_clk <= ~clock_cnt[3]; // ssp_clk frequency = 13,56MHz / 16 = 847,5 kHz
145
146 if(clock_cnt[6:4] == 3'b000) // set ssp_frame for 0...31
147 ssp_frame <= 1'b1;
148 else
149 ssp_frame <= 1'b0;
150
151end
152
153assign ssp_din = shift_out[7];
154
155endmodule
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