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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
//
// Copyright 2013 Ettus Research LLC
//
`timescale 500ps/1ps
module cvita_dechunker_tb();
// TB stimulus
reg clk = 0;
reg reset = 1;
reg clear = 0;
reg [15:0] quantum;
wire error;
// Check vars
reg [31:0] o_xfer_count = 0, i_xfer_count = 0;
reg [63:0] o_last_tdata = 0;
always #10 clk = ~clk;
initial $dumpfile("cvita_dechunker_tb.vcd");
initial $dumpvars(0,cvita_dechunker_tb);
function check_result;
input [31:0] o_xfer_count_arg;
input [31:0] i_xfer_count_arg;
input [63:0] o_last_tdata_arg;
input error_arg;
begin
//Check vars
check_result = 1;
check_result = check_result & ((o_xfer_count_arg == o_xfer_count) !== 0);
check_result = check_result & ((i_xfer_count_arg == i_xfer_count) !== 0);
check_result = check_result & ((o_last_tdata_arg == o_last_tdata) !== 0);
check_result = check_result & ((error_arg == error) != 0);
if (check_result) begin
$display ("... Passed");
end else begin
$display ("... FAILED!!!");
$display ("o_xfer_count = %d (Expected %d)",o_xfer_count,o_xfer_count_arg);
$display ("i_xfer_count = %d (Expected %d)",i_xfer_count,i_xfer_count_arg);
$display ("o_last_tdata = %h (Expected %h)",o_last_tdata,o_last_tdata_arg);
$display ("error = %d (Expected %d)",error,error_arg);
end
//Reset vars
o_xfer_count = 0;
i_xfer_count = 0;
o_last_tdata = 64'h0;
end
endfunction
task send_packet;
input [63:0] data_start;
input [31:0] len;
input [31:0] quant;
begin
if(quant < 2) begin
{i_tlast, i_tdata} <= { 1'b1, data_start[63:48],len[15:0], data_start[31:0] };
i_tvalid <= 1;
@(posedge clk);
i_tvalid <= 0;
end else begin
{i_tlast, i_tdata} <= { 1'b0, data_start[63:48],len[15:0], data_start[31:0] };
i_tvalid <= 1;
@(posedge clk);
repeat(quant - 2) begin
i_tdata <= i_tdata + 64'h0000_0002_0000_0002;
@(posedge clk);
end
i_tdata <= i_tdata + 64'h0000_0002_0000_0002;
i_tlast <= 1;
@(posedge clk);
i_tvalid <= 1'b0;
end // else: !if(len < 3)
end
endtask // send_packet
task reset_quantum_atomic;
input [15:0] quant;
begin
quantum <= quant;
clear <= 1;
@(posedge clk);
clear <= 0;
@(posedge clk);
end
endtask // reset_quantum_atomic
initial begin
#100 reset = 0;
#200000;
$finish;
end
reg [63:0] i_tdata;
reg i_tlast;
reg i_tvalid;
wire i_tready;
wire [63:0] o_tdata;
wire o_tlast, o_tvalid, o_tready;
initial begin
quantum <= 8;
i_tvalid <= 0;
while(reset) @(posedge clk);
$write ("Running test case: First packet after reset");
send_packet(64'h00000001_00000000, 32, 8);
@(posedge clk);
check_result(4,8,64'hxxxxxxxx_xxxxxx06, 0);
reset_quantum_atomic(10);
$write ("Running test case: sizeof(packet) < quantum");
send_packet(64'h00000001_00000000, 64, 10);
@(posedge clk);
check_result(8,10,64'hxxxxxxxx_xxxxxx0e, 0);
$write ("Running test case: sizeof(packet) == quantum");
send_packet(64'h00000001_00000000, 80, 10);
@(posedge clk);
check_result(10,10,64'hxxxxxxxx_xxxxxx12, 0);
$write ("Running test case: sizeof(packet) == quantum - 64bits");
send_packet(64'h00000001_00000000, 72, 10);
@(posedge clk);
check_result(9,10,64'hxxxxxxxx_xxxxxx10, 0);
$write ("Running test case: sizeof(packet) == quantum + 64bits");
send_packet(64'h00000001_00000000, 88, 10);
@(posedge clk);
check_result(32'hxxxxxxxx,10,64'hxxxxxxxx_xxxxxxxx, 1);
reset_quantum_atomic(10);
$write ("Running test case: sizeof(packet) > quantum");
send_packet(64'h00000001_00000000, 88, 10);
@(posedge clk);
check_result(32'hxxxxxxxx,10,64'hxxxxxxxx_xxxxxxxx, 1);
reset_quantum_atomic(8);
$write ("Running test case: sizeof(packet) == 2");
send_packet(64'h00000001_00000000, 8, 8);
@(posedge clk);
check_result(1,8,64'hxxxxxxxx_xxxxxx00, 0);
$write ("Running test case: Multiple packets");
send_packet(64'h00000001_00000000, 8, 8);
send_packet(64'h00000001_00000000, 16, 8);
send_packet(64'h00000001_00000000, 24, 8);
send_packet(64'h00000001_00000000, 32, 8);
@(posedge clk);
check_result(10,32,64'hxxxxxxxx_xxxxxx06, 0);
end // initial begin
cvita_dechunker dut (
.clk(clk), .reset(reset), .clear(clear), .frame_size(quantum),
.i_tdata(i_tdata), .i_tvalid(i_tvalid), .i_tready(i_tready),
.o_tdata(o_tdata), .o_tlast(o_tlast), .o_tvalid(o_tvalid), .o_tready(o_tready),
.error(error));
assign o_tready = 1;
always @(posedge clk) begin
if (o_tvalid & o_tready) begin
o_xfer_count <= o_xfer_count + 1;
o_last_tdata <= o_tdata;
end
if (i_tvalid & i_tready) i_xfer_count <= i_xfer_count + 1;
end
endmodule // cvita_dechunker_tb
|
