xiiregexbuilder
FPGA-Accelerated Regular Expression Matching Engineoutput-eg/tb_top.v (26644B)
1`timescale 1ns / 1ps
2
3module tb_top;
4 reg clk, en, rst, start, end_of_str;
5 reg [7:0] char_in;
6 wire [15:0] match_bus;
7 wire [15:0] active_bus;
8
9 top uut (.clk(clk), .en(en), .rst(rst), .start(start), .end_of_str(end_of_str), .char_in(char_in), .match_bus(match_bus), .active_bus(active_bus));
10
11 always #5 clk = ~clk;
12
13 initial begin
14 // synthesis translate_off
15 `ifndef SYNTHESIS
16 $dumpfile("dump.vcd");
17 $dumpvars(0, tb_top);
18 `endif
19 // synthesis translate_on
20
21 clk = 0; en = 1; rst = 1; start = 0; end_of_str = 0; char_in = 0;
22 #20 rst = 0; #10;
23
24 // Test case 0: "cat"
25 start = 1; #10 start = 0;
26 char_in = 8'h63; #10;
27 char_in = 8'h61; #10;
28 char_in = 8'h74; #10;
29 end_of_str = 1; #10;
30 // Match output is valid on the cycle immediately following end_of_str assertion
31 if (match_bus === 16'b0000000000000011) begin
32 $display("PASS: Test case 0 ('cat') matches expected mask 0000000000000011");
33 end else begin
34 $display("FAIL: Test case 0 ('cat') expected 0000000000000011, got %b", match_bus);
35 end
36 end_of_str = 0; #10;
37
38 // Test case 1: "dog"
39 start = 1; #10 start = 0;
40 char_in = 8'h64; #10;
41 char_in = 8'h6f; #10;
42 char_in = 8'h67; #10;
43 end_of_str = 1; #10;
44 // Match output is valid on the cycle immediately following end_of_str assertion
45 if (match_bus === 16'b0000000000000100) begin
46 $display("PASS: Test case 1 ('dog') matches expected mask 0000000000000100");
47 end else begin
48 $display("FAIL: Test case 1 ('dog') expected 0000000000000100, got %b", match_bus);
49 end
50 end_of_str = 0; #10;
51
52 // Test case 2: "tomcat"
53 start = 1; #10 start = 0;
54 char_in = 8'h74; #10;
55 char_in = 8'h6f; #10;
56 char_in = 8'h6d; #10;
57 char_in = 8'h63; #10;
58 char_in = 8'h61; #10;
59 char_in = 8'h74; #10;
60 end_of_str = 1; #10;
61 // Match output is valid on the cycle immediately following end_of_str assertion
62 if (match_bus === 16'b0000000000000000) begin
63 $display("PASS: Test case 2 ('tomcat') matches expected mask 0000000000000000");
64 end else begin
65 $display("FAIL: Test case 2 ('tomcat') expected 0000000000000000, got %b", match_bus);
66 end
67 end_of_str = 0; #10;
68
69 // Test case 3: "cot"
70 start = 1; #10 start = 0;
71 char_in = 8'h63; #10;
72 char_in = 8'h6f; #10;
73 char_in = 8'h74; #10;
74 end_of_str = 1; #10;
75 // Match output is valid on the cycle immediately following end_of_str assertion
76 if (match_bus === 16'b0000000000000010) begin
77 $display("PASS: Test case 3 ('cot') matches expected mask 0000000000000010");
78 end else begin
79 $display("FAIL: Test case 3 ('cot') expected 0000000000000010, got %b", match_bus);
80 end
81 end_of_str = 0; #10;
82
83 // Test case 4: "cut"
84 start = 1; #10 start = 0;
85 char_in = 8'h63; #10;
86 char_in = 8'h75; #10;
87 char_in = 8'h74; #10;
88 end_of_str = 1; #10;
89 // Match output is valid on the cycle immediately following end_of_str assertion
90 if (match_bus === 16'b0000000000000010) begin
91 $display("PASS: Test case 4 ('cut') matches expected mask 0000000000000010");
92 end else begin
93 $display("FAIL: Test case 4 ('cut') expected 0000000000000010, got %b", match_bus);
94 end
95 end_of_str = 0; #10;
96
97 // Test case 5: "ct"
98 start = 1; #10 start = 0;
99 char_in = 8'h63; #10;
100 char_in = 8'h74; #10;
101 end_of_str = 1; #10;
102 // Match output is valid on the cycle immediately following end_of_str assertion
103 if (match_bus === 16'b0000000000000000) begin
104 $display("PASS: Test case 5 ('ct') matches expected mask 0000000000000000");
105 end else begin
106 $display("FAIL: Test case 5 ('ct') expected 0000000000000000, got %b", match_bus);
107 end
108 end_of_str = 0; #10;
109
110 // Test case 6: "doog"
111 start = 1; #10 start = 0;
112 char_in = 8'h64; #10;
113 char_in = 8'h6f; #10;
114 char_in = 8'h6f; #10;
115 char_in = 8'h67; #10;
116 end_of_str = 1; #10;
117 // Match output is valid on the cycle immediately following end_of_str assertion
118 if (match_bus === 16'b0000000000000100) begin
119 $display("PASS: Test case 6 ('doog') matches expected mask 0000000000000100");
120 end else begin
121 $display("FAIL: Test case 6 ('doog') expected 0000000000000100, got %b", match_bus);
122 end
123 end_of_str = 0; #10;
124
125 // Test case 7: "dg"
126 start = 1; #10 start = 0;
127 char_in = 8'h64; #10;
128 char_in = 8'h67; #10;
129 end_of_str = 1; #10;
130 // Match output is valid on the cycle immediately following end_of_str assertion
131 if (match_bus === 16'b0000000000000100) begin
132 $display("PASS: Test case 7 ('dg') matches expected mask 0000000000000100");
133 end else begin
134 $display("FAIL: Test case 7 ('dg') expected 0000000000000100, got %b", match_bus);
135 end
136 end_of_str = 0; #10;
137
138 // Test case 8: "beep"
139 start = 1; #10 start = 0;
140 char_in = 8'h62; #10;
141 char_in = 8'h65; #10;
142 char_in = 8'h65; #10;
143 char_in = 8'h70; #10;
144 end_of_str = 1; #10;
145 // Match output is valid on the cycle immediately following end_of_str assertion
146 if (match_bus === 16'b0000000000001000) begin
147 $display("PASS: Test case 8 ('beep') matches expected mask 0000000000001000");
148 end else begin
149 $display("FAIL: Test case 8 ('beep') expected 0000000000001000, got %b", match_bus);
150 end
151 end_of_str = 0; #10;
152
153 // Test case 9: "bep"
154 start = 1; #10 start = 0;
155 char_in = 8'h62; #10;
156 char_in = 8'h65; #10;
157 char_in = 8'h70; #10;
158 end_of_str = 1; #10;
159 // Match output is valid on the cycle immediately following end_of_str assertion
160 if (match_bus === 16'b0000000000001000) begin
161 $display("PASS: Test case 9 ('bep') matches expected mask 0000000000001000");
162 end else begin
163 $display("FAIL: Test case 9 ('bep') expected 0000000000001000, got %b", match_bus);
164 end
165 end_of_str = 0; #10;
166
167 // Test case 10: "bp"
168 start = 1; #10 start = 0;
169 char_in = 8'h62; #10;
170 char_in = 8'h70; #10;
171 end_of_str = 1; #10;
172 // Match output is valid on the cycle immediately following end_of_str assertion
173 if (match_bus === 16'b0000000000000000) begin
174 $display("PASS: Test case 10 ('bp') matches expected mask 0000000000000000");
175 end else begin
176 $display("FAIL: Test case 10 ('bp') expected 0000000000000000, got %b", match_bus);
177 end
178 end_of_str = 0; #10;
179
180 // Test case 11: "fly"
181 start = 1; #10 start = 0;
182 char_in = 8'h66; #10;
183 char_in = 8'h6c; #10;
184 char_in = 8'h79; #10;
185 end_of_str = 1; #10;
186 // Match output is valid on the cycle immediately following end_of_str assertion
187 if (match_bus === 16'b0000000000010000) begin
188 $display("PASS: Test case 11 ('fly') matches expected mask 0000000000010000");
189 end else begin
190 $display("FAIL: Test case 11 ('fly') expected 0000000000010000, got %b", match_bus);
191 end
192 end_of_str = 0; #10;
193
194 // Test case 12: "fy"
195 start = 1; #10 start = 0;
196 char_in = 8'h66; #10;
197 char_in = 8'h79; #10;
198 end_of_str = 1; #10;
199 // Match output is valid on the cycle immediately following end_of_str assertion
200 if (match_bus === 16'b0000000000010000) begin
201 $display("PASS: Test case 12 ('fy') matches expected mask 0000000000010000");
202 end else begin
203 $display("FAIL: Test case 12 ('fy') expected 0000000000010000, got %b", match_bus);
204 end
205 end_of_str = 0; #10;
206
207 // Test case 13: "apple"
208 start = 1; #10 start = 0;
209 char_in = 8'h61; #10;
210 char_in = 8'h70; #10;
211 char_in = 8'h70; #10;
212 char_in = 8'h6c; #10;
213 char_in = 8'h65; #10;
214 end_of_str = 1; #10;
215 // Match output is valid on the cycle immediately following end_of_str assertion
216 if (match_bus === 16'b0000000000100000) begin
217 $display("PASS: Test case 13 ('apple') matches expected mask 0000000000100000");
218 end else begin
219 $display("FAIL: Test case 13 ('apple') expected 0000000000100000, got %b", match_bus);
220 end
221 end_of_str = 0; #10;
222
223 // Test case 14: "orange"
224 start = 1; #10 start = 0;
225 char_in = 8'h6f; #10;
226 char_in = 8'h72; #10;
227 char_in = 8'h61; #10;
228 char_in = 8'h6e; #10;
229 char_in = 8'h67; #10;
230 char_in = 8'h65; #10;
231 end_of_str = 1; #10;
232 // Match output is valid on the cycle immediately following end_of_str assertion
233 if (match_bus === 16'b0000000000100000) begin
234 $display("PASS: Test case 14 ('orange') matches expected mask 0000000000100000");
235 end else begin
236 $display("FAIL: Test case 14 ('orange') expected 0000000000100000, got %b", match_bus);
237 end
238 end_of_str = 0; #10;
239
240 // Test case 15: "banana"
241 start = 1; #10 start = 0;
242 char_in = 8'h62; #10;
243 char_in = 8'h61; #10;
244 char_in = 8'h6e; #10;
245 char_in = 8'h61; #10;
246 char_in = 8'h6e; #10;
247 char_in = 8'h61; #10;
248 end_of_str = 1; #10;
249 // Match output is valid on the cycle immediately following end_of_str assertion
250 if (match_bus === 16'b0000000000000000) begin
251 $display("PASS: Test case 15 ('banana') matches expected mask 0000000000000000");
252 end else begin
253 $display("FAIL: Test case 15 ('banana') expected 0000000000000000, got %b", match_bus);
254 end
255 end_of_str = 0; #10;
256
257 // Test case 16: "redcar"
258 start = 1; #10 start = 0;
259 char_in = 8'h72; #10;
260 char_in = 8'h65; #10;
261 char_in = 8'h64; #10;
262 char_in = 8'h63; #10;
263 char_in = 8'h61; #10;
264 char_in = 8'h72; #10;
265 end_of_str = 1; #10;
266 // Match output is valid on the cycle immediately following end_of_str assertion
267 if (match_bus === 16'b0000000001000000) begin
268 $display("PASS: Test case 16 ('redcar') matches expected mask 0000000001000000");
269 end else begin
270 $display("FAIL: Test case 16 ('redcar') expected 0000000001000000, got %b", match_bus);
271 end
272 end_of_str = 0; #10;
273
274 // Test case 17: "bluecar"
275 start = 1; #10 start = 0;
276 char_in = 8'h62; #10;
277 char_in = 8'h6c; #10;
278 char_in = 8'h75; #10;
279 char_in = 8'h65; #10;
280 char_in = 8'h63; #10;
281 char_in = 8'h61; #10;
282 char_in = 8'h72; #10;
283 end_of_str = 1; #10;
284 // Match output is valid on the cycle immediately following end_of_str assertion
285 if (match_bus === 16'b0000000001000000) begin
286 $display("PASS: Test case 17 ('bluecar') matches expected mask 0000000001000000");
287 end else begin
288 $display("FAIL: Test case 17 ('bluecar') expected 0000000001000000, got %b", match_bus);
289 end
290 end_of_str = 0; #10;
291
292 // Test case 18: "greencar"
293 start = 1; #10 start = 0;
294 char_in = 8'h67; #10;
295 char_in = 8'h72; #10;
296 char_in = 8'h65; #10;
297 char_in = 8'h65; #10;
298 char_in = 8'h6e; #10;
299 char_in = 8'h63; #10;
300 char_in = 8'h61; #10;
301 char_in = 8'h72; #10;
302 end_of_str = 1; #10;
303 // Match output is valid on the cycle immediately following end_of_str assertion
304 if (match_bus === 16'b0000000000000000) begin
305 $display("PASS: Test case 18 ('greencar') matches expected mask 0000000000000000");
306 end else begin
307 $display("FAIL: Test case 18 ('greencar') expected 0000000000000000, got %b", match_bus);
308 end
309 end_of_str = 0; #10;
310
311 // Test case 19: "lolo"
312 start = 1; #10 start = 0;
313 char_in = 8'h6c; #10;
314 char_in = 8'h6f; #10;
315 char_in = 8'h6c; #10;
316 char_in = 8'h6f; #10;
317 end_of_str = 1; #10;
318 // Match output is valid on the cycle immediately following end_of_str assertion
319 if (match_bus === 16'b0000000010000000) begin
320 $display("PASS: Test case 19 ('lolo') matches expected mask 0000000010000000");
321 end else begin
322 $display("FAIL: Test case 19 ('lolo') expected 0000000010000000, got %b", match_bus);
323 end
324 end_of_str = 0; #10;
325
326 // Test case 20: "lololo"
327 start = 1; #10 start = 0;
328 char_in = 8'h6c; #10;
329 char_in = 8'h6f; #10;
330 char_in = 8'h6c; #10;
331 char_in = 8'h6f; #10;
332 char_in = 8'h6c; #10;
333 char_in = 8'h6f; #10;
334 end_of_str = 1; #10;
335 // Match output is valid on the cycle immediately following end_of_str assertion
336 if (match_bus === 16'b0000000010000000) begin
337 $display("PASS: Test case 20 ('lololo') matches expected mask 0000000010000000");
338 end else begin
339 $display("FAIL: Test case 20 ('lololo') expected 0000000010000000, got %b", match_bus);
340 end
341 end_of_str = 0; #10;
342
343 // Test case 21: "lo"
344 start = 1; #10 start = 0;
345 char_in = 8'h6c; #10;
346 char_in = 8'h6f; #10;
347 end_of_str = 1; #10;
348 // Match output is valid on the cycle immediately following end_of_str assertion
349 if (match_bus === 16'b0000000010000000) begin
350 $display("PASS: Test case 21 ('lo') matches expected mask 0000000010000000");
351 end else begin
352 $display("FAIL: Test case 21 ('lo') expected 0000000010000000, got %b", match_bus);
353 end
354 end_of_str = 0; #10;
355
356 // Test case 22: "good"
357 start = 1; #10 start = 0;
358 char_in = 8'h67; #10;
359 char_in = 8'h6f; #10;
360 char_in = 8'h6f; #10;
361 char_in = 8'h64; #10;
362 end_of_str = 1; #10;
363 // Match output is valid on the cycle immediately following end_of_str assertion
364 if (match_bus === 16'b0000000100000000) begin
365 $display("PASS: Test case 22 ('good') matches expected mask 0000000100000000");
366 end else begin
367 $display("FAIL: Test case 22 ('good') expected 0000000100000000, got %b", match_bus);
368 end
369 end_of_str = 0; #10;
370
371 // Test case 23: "goodod"
372 start = 1; #10 start = 0;
373 char_in = 8'h67; #10;
374 char_in = 8'h6f; #10;
375 char_in = 8'h6f; #10;
376 char_in = 8'h64; #10;
377 char_in = 8'h6f; #10;
378 char_in = 8'h64; #10;
379 end_of_str = 1; #10;
380 // Match output is valid on the cycle immediately following end_of_str assertion
381 if (match_bus === 16'b0000000100000000) begin
382 $display("PASS: Test case 23 ('goodod') matches expected mask 0000000100000000");
383 end else begin
384 $display("FAIL: Test case 23 ('goodod') expected 0000000100000000, got %b", match_bus);
385 end
386 end_of_str = 0; #10;
387
388 // Test case 24: "go"
389 start = 1; #10 start = 0;
390 char_in = 8'h67; #10;
391 char_in = 8'h6f; #10;
392 end_of_str = 1; #10;
393 // Match output is valid on the cycle immediately following end_of_str assertion
394 if (match_bus === 16'b0000000000000000) begin
395 $display("PASS: Test case 24 ('go') matches expected mask 0000000000000000");
396 end else begin
397 $display("FAIL: Test case 24 ('go') expected 0000000000000000, got %b", match_bus);
398 end
399 end_of_str = 0; #10;
400
401 // Test case 25: "hello"
402 start = 1; #10 start = 0;
403 char_in = 8'h68; #10;
404 char_in = 8'h65; #10;
405 char_in = 8'h6c; #10;
406 char_in = 8'h6c; #10;
407 char_in = 8'h6f; #10;
408 end_of_str = 1; #10;
409 // Match output is valid on the cycle immediately following end_of_str assertion
410 if (match_bus === 16'b0000001000000000) begin
411 $display("PASS: Test case 25 ('hello') matches expected mask 0000001000000000");
412 end else begin
413 $display("FAIL: Test case 25 ('hello') expected 0000001000000000, got %b", match_bus);
414 end
415 end_of_str = 0; #10;
416
417 // Test case 26: "llo"
418 start = 1; #10 start = 0;
419 char_in = 8'h6c; #10;
420 char_in = 8'h6c; #10;
421 char_in = 8'h6f; #10;
422 end_of_str = 1; #10;
423 // Match output is valid on the cycle immediately following end_of_str assertion
424 if (match_bus === 16'b0000001000000000) begin
425 $display("PASS: Test case 26 ('llo') matches expected mask 0000001000000000");
426 end else begin
427 $display("FAIL: Test case 26 ('llo') expected 0000001000000000, got %b", match_bus);
428 end
429 end_of_str = 0; #10;
430
431 // Test case 27: "he"
432 start = 1; #10 start = 0;
433 char_in = 8'h68; #10;
434 char_in = 8'h65; #10;
435 end_of_str = 1; #10;
436 // Match output is valid on the cycle immediately following end_of_str assertion
437 if (match_bus === 16'b0000000000000000) begin
438 $display("PASS: Test case 27 ('he') matches expected mask 0000000000000000");
439 end else begin
440 $display("FAIL: Test case 27 ('he') expected 0000000000000000, got %b", match_bus);
441 end
442 end_of_str = 0; #10;
443
444 // Test case 28: "ad"
445 start = 1; #10 start = 0;
446 char_in = 8'h61; #10;
447 char_in = 8'h64; #10;
448 end_of_str = 1; #10;
449 // Match output is valid on the cycle immediately following end_of_str assertion
450 if (match_bus === 16'b0100010000000000) begin
451 $display("PASS: Test case 28 ('ad') matches expected mask 0100010000000000");
452 end else begin
453 $display("FAIL: Test case 28 ('ad') expected 0100010000000000, got %b", match_bus);
454 end
455 end_of_str = 0; #10;
456
457 // Test case 29: "abd"
458 start = 1; #10 start = 0;
459 char_in = 8'h61; #10;
460 char_in = 8'h62; #10;
461 char_in = 8'h64; #10;
462 end_of_str = 1; #10;
463 // Match output is valid on the cycle immediately following end_of_str assertion
464 if (match_bus === 16'b0000010000000000) begin
465 $display("PASS: Test case 29 ('abd') matches expected mask 0000010000000000");
466 end else begin
467 $display("FAIL: Test case 29 ('abd') expected 0000010000000000, got %b", match_bus);
468 end
469 end_of_str = 0; #10;
470
471 // Test case 30: "acd"
472 start = 1; #10 start = 0;
473 char_in = 8'h61; #10;
474 char_in = 8'h63; #10;
475 char_in = 8'h64; #10;
476 end_of_str = 1; #10;
477 // Match output is valid on the cycle immediately following end_of_str assertion
478 if (match_bus === 16'b0000010000000000) begin
479 $display("PASS: Test case 30 ('acd') matches expected mask 0000010000000000");
480 end else begin
481 $display("FAIL: Test case 30 ('acd') expected 0000010000000000, got %b", match_bus);
482 end
483 end_of_str = 0; #10;
484
485 // Test case 31: "abcd"
486 start = 1; #10 start = 0;
487 char_in = 8'h61; #10;
488 char_in = 8'h62; #10;
489 char_in = 8'h63; #10;
490 char_in = 8'h64; #10;
491 end_of_str = 1; #10;
492 // Match output is valid on the cycle immediately following end_of_str assertion
493 if (match_bus === 16'b0000010000000000) begin
494 $display("PASS: Test case 31 ('abcd') matches expected mask 0000010000000000");
495 end else begin
496 $display("FAIL: Test case 31 ('abcd') expected 0000010000000000, got %b", match_bus);
497 end
498 end_of_str = 0; #10;
499
500 // Test case 32: "the end"
501 start = 1; #10 start = 0;
502 char_in = 8'h74; #10;
503 char_in = 8'h68; #10;
504 char_in = 8'h65; #10;
505 char_in = 8'h20; #10;
506 char_in = 8'h65; #10;
507 char_in = 8'h6e; #10;
508 char_in = 8'h64; #10;
509 end_of_str = 1; #10;
510 // Match output is valid on the cycle immediately following end_of_str assertion
511 if (match_bus === 16'b0001100000000000) begin
512 $display("PASS: Test case 32 ('the end') matches expected mask 0001100000000000");
513 end else begin
514 $display("FAIL: Test case 32 ('the end') expected 0001100000000000, got %b", match_bus);
515 end
516 end_of_str = 0; #10;
517
518 // Test case 33: "end"
519 start = 1; #10 start = 0;
520 char_in = 8'h65; #10;
521 char_in = 8'h6e; #10;
522 char_in = 8'h64; #10;
523 end_of_str = 1; #10;
524 // Match output is valid on the cycle immediately following end_of_str assertion
525 if (match_bus === 16'b0000100000000000) begin
526 $display("PASS: Test case 33 ('end') matches expected mask 0000100000000000");
527 end else begin
528 $display("FAIL: Test case 33 ('end') expected 0000100000000000, got %b", match_bus);
529 end
530 end_of_str = 0; #10;
531
532 // Test case 34: "xay"
533 start = 1; #10 start = 0;
534 char_in = 8'h78; #10;
535 char_in = 8'h61; #10;
536 char_in = 8'h79; #10;
537 end_of_str = 1; #10;
538 // Match output is valid on the cycle immediately following end_of_str assertion
539 if (match_bus === 16'b0010000000000000) begin
540 $display("PASS: Test case 34 ('xay') matches expected mask 0010000000000000");
541 end else begin
542 $display("FAIL: Test case 34 ('xay') expected 0010000000000000, got %b", match_bus);
543 end
544 end_of_str = 0; #10;
545
546 // Test case 35: "xayxby"
547 start = 1; #10 start = 0;
548 char_in = 8'h78; #10;
549 char_in = 8'h61; #10;
550 char_in = 8'h79; #10;
551 char_in = 8'h78; #10;
552 char_in = 8'h62; #10;
553 char_in = 8'h79; #10;
554 end_of_str = 1; #10;
555 // Match output is valid on the cycle immediately following end_of_str assertion
556 if (match_bus === 16'b0010000000000000) begin
557 $display("PASS: Test case 35 ('xayxby') matches expected mask 0010000000000000");
558 end else begin
559 $display("FAIL: Test case 35 ('xayxby') expected 0010000000000000, got %b", match_bus);
560 end
561 end_of_str = 0; #10;
562
563 // Test case 36: "xy"
564 start = 1; #10 start = 0;
565 char_in = 8'h78; #10;
566 char_in = 8'h79; #10;
567 end_of_str = 1; #10;
568 // Match output is valid on the cycle immediately following end_of_str assertion
569 if (match_bus === 16'b0000000000000000) begin
570 $display("PASS: Test case 36 ('xy') matches expected mask 0000000000000000");
571 end else begin
572 $display("FAIL: Test case 36 ('xy') expected 0000000000000000, got %b", match_bus);
573 end
574 end_of_str = 0; #10;
575
576 // Test case 37: "ac"
577 start = 1; #10 start = 0;
578 char_in = 8'h61; #10;
579 char_in = 8'h63; #10;
580 end_of_str = 1; #10;
581 // Match output is valid on the cycle immediately following end_of_str assertion
582 if (match_bus === 16'b0100000000000000) begin
583 $display("PASS: Test case 37 ('ac') matches expected mask 0100000000000000");
584 end else begin
585 $display("FAIL: Test case 37 ('ac') expected 0100000000000000, got %b", match_bus);
586 end
587 end_of_str = 0; #10;
588
589 // Test case 38: "bd"
590 start = 1; #10 start = 0;
591 char_in = 8'h62; #10;
592 char_in = 8'h64; #10;
593 end_of_str = 1; #10;
594 // Match output is valid on the cycle immediately following end_of_str assertion
595 if (match_bus === 16'b0100000000000000) begin
596 $display("PASS: Test case 38 ('bd') matches expected mask 0100000000000000");
597 end else begin
598 $display("FAIL: Test case 38 ('bd') expected 0100000000000000, got %b", match_bus);
599 end
600 end_of_str = 0; #10;
601
602 // Test case 39: "bc"
603 start = 1; #10 start = 0;
604 char_in = 8'h62; #10;
605 char_in = 8'h63; #10;
606 end_of_str = 1; #10;
607 // Match output is valid on the cycle immediately following end_of_str assertion
608 if (match_bus === 16'b0100000000000000) begin
609 $display("PASS: Test case 39 ('bc') matches expected mask 0100000000000000");
610 end else begin
611 $display("FAIL: Test case 39 ('bc') expected 0100000000000000, got %b", match_bus);
612 end
613 end_of_str = 0; #10;
614
615 // Test case 40: "1234"
616 start = 1; #10 start = 0;
617 char_in = 8'h31; #10;
618 char_in = 8'h32; #10;
619 char_in = 8'h33; #10;
620 char_in = 8'h34; #10;
621 end_of_str = 1; #10;
622 // Match output is valid on the cycle immediately following end_of_str assertion
623 if (match_bus === 16'b1000000000000000) begin
624 $display("PASS: Test case 40 ('1234') matches expected mask 1000000000000000");
625 end else begin
626 $display("FAIL: Test case 40 ('1234') expected 1000000000000000, got %b", match_bus);
627 end
628 end_of_str = 0; #10;
629
630 // Test case 41: "14"
631 start = 1; #10 start = 0;
632 char_in = 8'h31; #10;
633 char_in = 8'h34; #10;
634 end_of_str = 1; #10;
635 // Match output is valid on the cycle immediately following end_of_str assertion
636 if (match_bus === 16'b1000000000000000) begin
637 $display("PASS: Test case 41 ('14') matches expected mask 1000000000000000");
638 end else begin
639 $display("FAIL: Test case 41 ('14') expected 1000000000000000, got %b", match_bus);
640 end
641 end_of_str = 0; #10;
642
643 // Test case 42: "124"
644 start = 1; #10 start = 0;
645 char_in = 8'h31; #10;
646 char_in = 8'h32; #10;
647 char_in = 8'h34; #10;
648 end_of_str = 1; #10;
649 // Match output is valid on the cycle immediately following end_of_str assertion
650 if (match_bus === 16'b0000000000000000) begin
651 $display("PASS: Test case 42 ('124') matches expected mask 0000000000000000");
652 end else begin
653 $display("FAIL: Test case 42 ('124') expected 0000000000000000, got %b", match_bus);
654 end
655 end_of_str = 0; #10;
656
657 $display("All tests completed.");
658 #100; $finish;
659 end
660endmodule