FreeCalypso > hg > fc-sim-sniff

annotate fpga/sniffer-pps/pps_catcher.v @ 58:95ed46b5f8f1 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
doc/Sniffing-hw-setup: mv-sniffer is here
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 04 Oct 2023 05:55:09 +0000
parents 0f74428c177c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
28
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 * This Verilog module is our PPS catcher. It is a state machine that analyzes
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 * the stream of Rx characters from the primary sniffer and detects the
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 * positions of these two special chars:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 *
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 * - the PPS1 byte of the card's PPS response;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 * - the PCK byte concluding that PPS response *if* PPS1 indicated a speed
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 * enhancement mode which we support.
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 */
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 module pps_catcher (IntClk, SIM_RST_sync, Rx_strobe, Rx_char,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 pos_PPS_resp_PPS1, pos_PPS_resp_PCK);
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 input IntClk;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 input SIM_RST_sync;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 input Rx_strobe;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 input [7:0] Rx_char;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 output pos_PPS_resp_PPS1, pos_PPS_resp_PCK;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 /* state machine */
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23 localparam
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24 INITIAL = 5'h00,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25 ATR_T0 = 5'h01,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
26 ATR_TAn = 5'h02,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27 ATR_TBn = 5'h03,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28 ATR_TCn = 5'h04,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 ATR_TDn = 5'h05,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30 ATR_HIST = 5'h06,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
31 ATR_TCK = 5'h07,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
32 READY_FOR_PPS = 5'h08,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 REQ_PPS0 = 5'h09,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34 REQ_PPS1 = 5'h0A,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35 REQ_PPS2 = 5'h0B,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
36 REQ_PPS3 = 5'h0C,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
37 REQ_PCK = 5'h0F,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
38 READY_FOR_RESP = 5'h10,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
39 RESP_PPS0 = 5'h11,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
40 RESP_PPS1 = 5'h12,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
41 RESP_PPS2 = 5'h13,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
42 RESP_PPS3 = 5'h14,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
43 RESP_PCK = 5'h17,
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
44 DONE = 5'h1F
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
45 ;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
46
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
47 reg [4:0] state;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
48 reg [3:0] Y, K;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
49 reg have_TCK;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
50
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
51 always @(posedge IntClk)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
52 if (!SIM_RST_sync)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
53 begin
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
54 state <= INITIAL;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
55 have_TCK <= 1'b0;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
56 end
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
57 else case (state)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
58 INITIAL:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
59 if (Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
60 begin
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
61 if (Rx_char == 8'h3B)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
62 state <= ATR_T0;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
63 else
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
64 state <= DONE;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
65 end
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
66 ATR_T0:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
67 if (Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
68 begin
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
69 Y <= Rx_char[7:4];
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
70 K <= Rx_char[3:0];
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
71 state <= ATR_TAn;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
72 end
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
73 ATR_TAn:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
74 if (!Y[0] || Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
75 state <= ATR_TBn;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
76 ATR_TBn:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
77 if (!Y[1] || Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
78 state <= ATR_TCn;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
79 ATR_TCn:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
80 if (!Y[2] || Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
81 state <= ATR_TDn;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
82 ATR_TDn:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
83 if (!Y[3])
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
84 state <= ATR_HIST;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
85 else if (Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
86 begin
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
87 Y <= Rx_char[7:4];
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
88 if (Rx_char[3:0] != 4'h0)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
89 have_TCK <= 1'b1;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
90 state <= ATR_TAn;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
91 end
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
92 ATR_HIST:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
93 if (K == 4'd0)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
94 state <= ATR_TCK;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
95 else if (Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
96 K <= K - 4'd1;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
97 ATR_TCK:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
98 if (!have_TCK || Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
99 state <= READY_FOR_PPS;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
100 READY_FOR_PPS:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
101 if (Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
102 begin
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
103 if (Rx_char == 8'hFF)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
104 state <= REQ_PPS0;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
105 else
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
106 state <= DONE;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
107 end
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
108 REQ_PPS0:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
109 if (Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
110 begin
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
111 Y <= Rx_char[7:4];
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
112 state <= REQ_PPS1;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
113 end
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
114 REQ_PPS1:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
115 if (!Y[0] || Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
116 state <= REQ_PPS2;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
117 REQ_PPS2:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
118 if (!Y[1] || Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
119 state <= REQ_PPS3;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
120 REQ_PPS3:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
121 if (!Y[2] || Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
122 state <= REQ_PCK;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
123 REQ_PCK:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124 if (Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125 state <= READY_FOR_RESP;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 READY_FOR_RESP:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 if (Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 begin
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 if (Rx_char == 8'hFF)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 state <= RESP_PPS0;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 else
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 state <= DONE;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 end
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 RESP_PPS0:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 if (Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 begin
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 Y <= Rx_char[7:4];
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 if (Rx_char[4])
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 state <= RESP_PPS1;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 else
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 state <= DONE;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 end
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 RESP_PPS1:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 if (Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 begin
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 if (Rx_char[7:2] == 6'b100101)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 state <= RESP_PPS2;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 else
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 state <= DONE;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 end
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 RESP_PPS2:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 if (!Y[1] || Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 state <= RESP_PPS3;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 RESP_PPS3:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 if (!Y[2] || Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 state <= RESP_PCK;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 RESP_PCK:
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 if (Rx_strobe)
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 state <= DONE;
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 endcase
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 assign pos_PPS_resp_PPS1 = (state == RESP_PPS1);
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 assign pos_PPS_resp_PCK = (state == RESP_PCK);
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164
0f74428c177c fpga/sniffer-pps: first version
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 endmodule