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
|
// DESCRIPTION: Verilator: Verilog Test module
// This file ONLY is placed into the Public Domain, for any use,
// without warranty.
// SPDX-License-Identifier: CC0-1.0
`timescale 1ns / 1ps
module t (/*AUTOARG*/
// Inputs
clk
);
input clk;
integer cyc; initial cyc = 0;
reg [63:0] crc;
reg [31:0] sum;
wire [8:0] Output;
wire [8:0] Input = crc[8:0];
assigns assigns (/*AUTOINST*/
// Outputs
.Output (Output[8:0]),
// Inputs
.Input (Input[8:0]));
always @ (posedge clk) begin
`ifdef TEST_VERBOSE
$write("[%0t] cyc==%0d crc=%x q=%x\n", $time, cyc, crc, sum);
`endif
cyc <= cyc + 1;
crc <= {crc[62:0], crc[63] ^ crc[2] ^ crc[0]};
if (cyc==0) begin
// Setup
crc <= 64'h5aef0c8d_d70a4497;
sum <= 32'h0;
end
else if (cyc>10 && cyc<90) begin
sum <= {sum[30:0],sum[31]} ^ {23'h0, crc[8:0]};
end
else if (cyc==99) begin
if (sum !== 32'he8bbd130) $stop;
$write("*-* All Finished *-*\n");
$finish;
end
end
endmodule
module assigns(Input, Output);
input [8:0] Input;
output [8:0] Output;
genvar i;
generate
for (i = 0; i < 8; i = i + 1) begin : ap
assign Output[(i>0) ? i-1 : 8] = Input[(i>0) ? i-1 : 8];
end
endgenerate
endmodule
|
