1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
module vita_tx_control
#(parameter BASE=0,
parameter WIDTH=32)
(input clk, input reset, input clear,
input set_stb, input [7:0] set_addr, input [31:0] set_data,
input [63:0] vita_time,
output error,
output reg [3:0] error_code,
// From vita_tx_deframer
input [5+64+WIDTH-1:0] sample_fifo_i,
input sample_fifo_src_rdy_i,
output sample_fifo_dst_rdy_o,
// To DSP Core
output [WIDTH-1:0] sample,
output run,
input strobe,
output [31:0] debug
);
assign sample = sample_fifo_i[5+64+WIDTH-1:5+64];
wire [63:0] send_time = sample_fifo_i[63:0];
wire eop = sample_fifo_i[64];
wire eob = sample_fifo_i[65];
wire sob = sample_fifo_i[66];
wire send_at = sample_fifo_i[67];
wire seqnum_err = sample_fifo_i[68];
wire now, early, late, too_early;
// FIXME ignore too_early for now for timing reasons
assign too_early = 0;
time_compare
time_compare (.time_now(vita_time), .trigger_time(send_time), .now(now), .early(early),
.late(late), .too_early());
// .late(late), .too_early(too_early));
localparam IBS_IDLE = 0;
localparam IBS_RUN = 1; // FIXME do we need this?
localparam IBS_CONT_BURST = 2;
localparam IBS_ERROR = 3;
localparam IBS_ERROR_DONE = 4;
localparam CODE_UNDERRUN = 2;
localparam CODE_SEQ_ERROR = 4;
localparam CODE_TIME_ERROR = 8;
reg [2:0] ibs_state;
wire clear_state;
setting_reg #(.my_addr(BASE+1)) sr
(.clk(clk),.rst(rst),.strobe(set_stb),.addr(set_addr),
.in(set_data),.out(),.changed(clear_state));
always @(posedge clk)
if(reset | clear_state)
ibs_state <= 0;
else
case(ibs_state)
IBS_IDLE :
if(sample_fifo_src_rdy_i)
if(seqnum_err)
begin
ibs_state <= IBS_ERROR;
error_code <= CODE_SEQ_ERROR;
end
else if(~send_at | now)
ibs_state <= IBS_RUN;
else if(late | too_early)
begin
ibs_state <= IBS_ERROR;
error_code <= CODE_TIME_ERROR;
end
IBS_RUN :
if(strobe)
if(~sample_fifo_src_rdy_i)
begin
ibs_state <= IBS_ERROR;
error_code <= CODE_UNDERRUN;
end
else if(eop)
if(eob)
ibs_state <= IBS_IDLE;
else
ibs_state <= IBS_CONT_BURST;
IBS_CONT_BURST :
if(strobe)
begin
ibs_state <= IBS_ERROR_DONE;
error_code <= CODE_UNDERRUN;
end
else if(sample_fifo_src_rdy_i)
if(seqnum_err)
begin
ibs_state <= IBS_ERROR;
error_code <= CODE_SEQ_ERROR;
end
else
ibs_state <= IBS_RUN;
IBS_ERROR :
if(sample_fifo_src_rdy_i & eop)
ibs_state <= IBS_ERROR_DONE;
IBS_ERROR_DONE :
;
endcase // case (ibs_state)
assign sample_fifo_dst_rdy_o = (ibs_state == IBS_ERROR) | (strobe & (ibs_state == IBS_RUN)); // FIXME also cleanout
assign run = (ibs_state == IBS_RUN) | (ibs_state == IBS_CONT_BURST);
assign error = (ibs_state == IBS_ERROR_DONE);
assign debug = { { now,early,late,too_early,eop,eob,sob,send_at },
{ sample_fifo_src_rdy_i, sample_fifo_dst_rdy_o, strobe, run, error, ibs_state[2:0] },
{ 8'b0 },
{ 8'b0 } };
endmodule // vita_tx_control
|
