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Multiple Driver Nets _segmento{OBUF[0]
von ricardo (Guest)

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Help me .... I do not know where this error is.
1
LIBRARY ieee;

2
USE ieee.std_logic_1164.ALL;

3
use ieee.numeric_std.all;

4
use ieee.std_logic_unsigned.all;

5
use ieee.std_logic_arith.all;

6
7
entity colculadora_4bits is

8
Port(chaves_a, chaves_b: in std_logic_vector(3 downto 0);

9
         led: inout bit;

10
        led_1: inout bit;

11
        segmento: out bit_VECTOR(0 TO 6);

12
        chave_sinal: inout std_logic;

13
        clk: in std_logic;

14
        display: out bit_VECTOR(7 DOWNTO 0);

15
         x: inout integer;

16
        subtracao, soma: inout integer);

17
end colculadora_4bits;

18
19
architecture Behavioral of colculadora_4bits is

20
21
begin

22
23
process(chaves_a, chaves_b, chave_sinal)

24
begin

25
26
    if (chave_sinal = '0') then

27
        subtracao <= 0;

28
        soma <= conv_integer(chaves_a) + conv_integer(chaves_b);

29
    elsif(chave_sinal = '1') then

30
        soma <= 0;

31
        subtracao <= conv_integer(chaves_a) - conv_integer(chaves_b);

32
    END IF;

33
end process;

34
35
36
PROCESS(subtracao)

37
begin

38
        if (subtracao < 0) then

39
            led_1 <= '1';

40
            led <= '0';

41
        elsif(subtracao >= 0) then

42
            led <= '1';

43
            led_1 <= '0';

44
        end

45
    if;

46
end process;

47
48
49
PROCESS(x, soma, subtracao, chave_sinal, clk)

50
BEGIN

51
52
        if (subtracao <= 0) then

53
            x <= subtracao + (subtracao * (-2));

54
         else 

55
          x<= subtracao;

56
        end if;

57
        

58
        if (chave_sinal = '1') then

59
            if (x = 0) then

60
                if (clk 'event and clk='1') then

61
                

62
                    display <="11111110";  

63
                   segmento <= "0000001";  

64
                end if; 

65
             if (clk'event and clk = '0') then

66
                display <= "11111101";

67
               segmento <= "0000001";

68
            end if;

69
            

70
            elsif(x = 1) then

71
            if (clk 'event and clk = '1') then 

72
            

73
                display <="11111110";  

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                segmento <= "1001111";

75
           end if;

76
        if (clk'event and clk = '0') then

77
                display <= "11111101";

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                segmento <= "0000001";

79
        end if;

80
        

81
        elsif(x = 2) then

82
        if (clk 'event and clk='1') then 

83
            display <="11111110";  

84
            segmento <= "0010010";

85
            end if;

86
        if (clk'event and clk = '0') then

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            display <= "11111101";

88
            segmento <= "0000001";

89
            end if;

90
            

91
        elsif(x = 3) then

92
        if (clk 'event and clk='1') then 

93
        display <="11111110"; 

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        segmento <= "0000110"; 

95
        end if;

96
        if (clk'event and clk = '0') then

97
        display <= "11111101";

98
        segmento <= "0000001";

99
        end if;

100
        

101
        elsif(x = 4) then

102
        if (clk 'event and clk='1') then 

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        display <="11111110"; 

104
        segmento <= "1001100";

105
        end if;

106
            if (clk'event and clk = '0') then

107
            display <= "11111101";

108
           segmento <= "0000001";

109
            end if;

110
            

111
            

112
        elsif(x = 5) then

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        if (clk 'event and clk='1') then 

114
        display <="11111110";

115
        segmento <= "0100100";

116
        end if;

117
        if (clk'event and clk = '0') then

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        display <= "11111101";

119
        segmento <= "0000001";

120
        end if;

121
        

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        elsif(x = 6) then

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       if (clk 'event and clk='1') then 

124
        display <="11111110";

125
        segmento <= "0100000";

126
        end if;

127
        if (clk'event and clk = '0') then

128
        display <= "11111101";

129
        segmento <= "0000001";

130
        end if;

131
        

132
        elsif(x = 7) then

133
        if (clk 'event and clk='1') then 

134
        display <="11111110";

135
        segmento <= "0001111";

136
        end if;

137
        if (clk'        event and clk = '0') then

138
        display <= "11111101";

139
        segmento <= "0000001";

140
        end if;

141
        

142
        elsif(x = 8) then

143
        if (clk 'event and clk='1') then 

144
        display <="11111110";

145
        segmento <= "1111111";

146
        end if;

147
        if (clk'        event and clk = '0') then

148
        display <= "11111101";

149
        segmento <= "0000001";

150
        end if;

151
        

152
        elsif(x = 9) then

153
        if (clk 'event and clk='1') then 

154
        display <="11111110";

155
        segmento <= "0000100";

156
        end if;

157
        if (clk'        event and clk = '0') then

158
        display <= "11111101";

159
        segmento <= "0000001";

160
        end if;

161
        

162
        elsif(x = 10) then

163
        if (clk 'event and clk='1') then 

164
        display <="11111110";

165
        segmento <= "0000001";

166
        end if;

167
        if (clk'event and clk = '0') then

168
        display <= "11111101";

169
        segmento <= "1001111";

170
        end if;

171
        

172
        elsif(x = 11) then

173
        if (clk 'event and clk='1') then 

174
        display <="11111110";

175
        segmento <= "1001111";

176
        end if;

177
        if (clk'event and clk = '0') then

178
        display <= "11111101";

179
        segmento <= "1001111";

180
        end if;

181
        

182
        elsif(x = 12) then

183
        if (clk 'event and clk='1') then  

184
        display <="11111110";  

185
        segmento <= "0010010";

186
        end if;

187
        if (clk'event and clk = '0') then

188
        display <= "11111101";

189
        segmento <= "1001111";

190
        end if;

191
        

192
        elsif(x = 13) then

193
        if (clk 'event and clk='1') then  

194
        display <="11111110"; 

195
        segmento <= "0000110";

196
        end if;

197
        if (clk'event and clk = '0') then

198
        display <= "11111101";

199
        segmento <= "1001111";

200
        end if;

201
        

202
        elsif(x = 14) then

203
        if (clk 'event and clk='1') then  

204
        display <="11111110"; 

205
        segmento <= "1001100";

206
        end if;

207
        if (clk'event and clk = '0') then

208
        display <= "11111101";

209
        segmento <= "1001111";

210
        end if;

211
        

212
        elsif(x = 15) then

213
        if (clk 'event and clk='1') then  

214
        display <="11111110";

215
        segmento <= "0100100";

216
        end if;

217
        if (clk'event and clk = '0') then

218
        display <= "11111101";

219
        segmento <= "1001111";

220
        end if;

221
  end if;

222
end if;

223
224
225
  if (chave_sinal = '0') then

226
    

227
    if (soma = 0) then

228
        if (clk'event and clk='1') then  

229
        display <="11111110";  

230
        segmento <= "0000001";   

231
        end if;

232
        if (clk'event and clk = '0') then

233
        display <= "11111101" after 5ns;

234
        segmento <= "0000001" after 5ns;

235
        end if;

236
        

237
        elsif(soma = 1) then

238
        if (clk'event and clk='1') then  

239
        display <="11111110";  

240
        segmento <= "1001111";

241
        end if;

242
        if (clk'event and clk = '0') then

243
        display <= "11111101";

244
        segmento <= "0000001";

245
        end if;

246
        

247
        elsif(soma = 2) then

248
       if (clk'event and clk='1') then

249
        display <="11111110";  

250
        segmento <= "0010010";

251
        end if;

252
        if (clk'event and clk = '0') then

253
        display <= "11111101";

254
        segmento <= "0000001";

255
        end if;

256
        

257
        elsif(soma = 3) then

258
        if (clk'event and clk='1') then

259
        display <="11111110"; 

260
        segmento <= "0000110"; 

261
        end if;

262
        if (clk'event and clk = '0') then

263
        display <= "11111101";

264
        segmento <= "0000001";

265
        end if;

266
        

267
        elsif(soma = 4) then

268
        if (clk'event and clk='1') then  

269
        display <="11111110"; 

270
        segmento <= "1001100";

271
        end if;

272
        if (clk'event and clk = '0') then

273
        display <= "11111101";

274
        segmento <= "0000001";

275
        end if;

276
        

277
        elsif(soma = 5) then

278
        if (clk'event and clk='1') then  

279
        display <="11111110";

280
        segmento <= "0100100";

281
        end if;

282
        if (clk'event and clk = '0') then

283
        display <= "11111101";

284
        segmento <= "0000001";

285
        end if;

286
        

287
        elsif(soma = 6) then

288
        if (clk'event and clk='1') then  

289
        display <="11111110";

290
        segmento <= "0100000";

291
        end if;

292
        if (clk'event and clk = '0') then

293
        display <= "11111101";

294
        segmento <= "0000001";

295
        end if;

296
        

297
        elsif(soma = 7) then

298
        if (clk'event and clk='1') then  

299
        display <="11111110";

300
        segmento <= "0001111";

301
        end if;

302
        if (clk'event and clk = '0') then

303
        display <= "11111101";

304
        segmento <= "0000001";

305
        end if;

306
        

307
        elsif(soma = 8) then

308
        if (clk'event and clk='1') then 

309
        display <="11111110";

310
        segmento <= "1111111";

311
        end if;

312
        if (clk'event and clk = '0') then

313
        display <= "11111101";

314
        segmento <= "0000001";

315
        end if;

316
        

317
        elsif(soma = 9) then

318
        if (clk'event and clk='1') then  

319
        display <="11111110";

320
        segmento <= "0000100";

321
        end if;

322
        if (clk'event and clk = '0') then

323
        display <= "11111101";

324
        segmento <= "0000001";

325
        end if;

326
        

327
        elsif(soma = 10) then

328
        if (clk'event and clk='1') then  

329
        display <="11111110";

330
        segmento <= "0000001";

331
        end if;

332
        if (clk'event and clk = '0') then

333
        display <= "11111101";

334
        segmento <= "1001111";

335
        end if;

336
        

337
        elsif(soma = 11) then

338
        if (clk'event and clk='1') then  

339
        display <="11111110";

340
        segmento <= "1001111";

341
        end if;

342
        if (clk'event and clk = '0') then

343
        display <= "11111101";

344
        segmento <= "1001111";

345
        end if;

346
        

347
        elsif(soma = 12) then

348
        if (clk'event and clk='1') then  

349
        display <="11111110";  

350
        segmento <= "0010010";

351
        end if;

352
        if (clk'event and clk = '0') then

353
        display <= "11111101";

354
        segmento <= "1001111";

355
        end if;

356
        

357
        elsif(soma = 13) then

358
        if (clk'event and clk='1') then  

359
        display <="11111110"; 

360
        segmento <= "0000110";

361
        end if;

362
        if (clk'event and clk = '0') then

363
        display <= "11111101";

364
        segmento <= "1001111";

365
         end if;

366
        

367
        elsif(soma = 14) then

368
        if (clk'event and clk='1') then  

369
        display <="11111110"; 

370
        segmento <= "1001100";

371
        end if;

372
        if (clk'event and clk = '0') then

373
        display <= "11111101";

374
        segmento <= "1001111";

375
        end if;

376
        

377
        elsif(soma = 15) then

378
        if (clk'event and clk='1') then  

379
        display <="11111110";

380
        segmento <= "0100100";

381
        end if;

382
        if (clk'event and clk = '0') then

383
        display <= "11111101";

384
        segmento <= "1001111";

385
        end if;

386
        

387
        elsif(soma = 16) then

388
        if (clk'event and clk='1') then  

389
        display <="11111110";

390
        segmento <= "0100000";

391
        end if;

392
        if (clk'event and clk = '0') then

393
        display <= "11111101";

394
        segmento <= "1001111";

395
        end if;

396
        

397
        elsif(soma = 17) then

398
        if (clk'event and clk='1') then 

399
        display <="11111110";

400
        segmento <= "0001111";

401
        end if;

402
        if (clk'event and clk = '0') then

403
        display <= "11111101";

404
        segmento <= "1001111";

405
        end if;

406
        

407
        elsif(soma = 18) then

408
        if (clk'event and clk='1') then  

409
        display <="11111110";

410
        segmento <= "1111111";

411
        end if;

412
        if (clk'event and clk = '0') then

413
        display <= "11111101";

414
        segmento <= "1001111";

415
        end if;

416
        

417
        elsif(soma = 19) then

418
        if (clk'event and clk='1') then  

419
        display <="11111110";

420
        segmento <= "0000100";

421
        end if;

422
        if (clk'event and clk = '0') then

423
        display <= "11111101";

424
        segmento <= "1001111";

425
        end if;

426
        

427
        elsif(soma = 20) then

428
        if (clk'event and clk='1') then  

429
        display <="11111110";  

430
        segmento <= "0000001";

431
        end if;

432
        if (clk'event and clk = '0') then

433
        display <= "11111101";

434
        segmento <= "0010010";

435
        end if;

436
        

437
        elsif(soma = 21) then

438
        if (clk'event and clk='1') then  

439
        display <="11111110";

440
        segmento <= "1001111";

441
        end if;

442
        if (clk'event and clk = '0') then

443
        display <= "11111101";

444
        segmento <= "0010010";

445
        end if;

446
        

447
        elsif(soma = 22) then

448
        if (clk'event and clk='1') then  

449
        display <="11111110";  

450
        segmento <= "0010010";

451
        end if;

452
        if (clk'event and clk = '0') then

453
        display <= "11111101";

454
        segmento <= "0010010";

455
        end if;

456
        

457
        elsif(soma = 23) then

458
        if (clk'event and clk='1') then  

459
        display <="11111110"; 

460
        segmento <= "0000110";

461
        end if;

462
        if (clk'event and clk = '0') then

463
        display <= "11111101";

464
        segmento <= "0010010";

465
        end if;

466
        

467
        elsif(soma = 24) then

468
        if (clk'event and clk='1') then  

469
        display <="11111110"; 

470
        segmento <= "1001100";

471
        end if;

472
        if (clk'event and clk = '0') then

473
        display <= "11111101";

474
        segmento <= "0010010";

475
        end if;

476
        

477
        elsif(soma = 25) then

478
        if (clk'event and clk='1') then  

479
        display <="11111110";

480
        segmento <= "0100100";

481
        end if;

482
        if (clk'event and clk = '0') then

483
        display <= "11111101";

484
        segmento <= "0010010";

485
        end if;

486
        

487
        elsif(soma = 26) then

488
        if (clk'event and clk='1') then  

489
         display <="11111110";

490
        segmento <= "0000110";

491
        end if;

492
        if (clk'event and clk='0') then

493
        display <="11111101"; 

494
        segmento <= "0010010";

495
        end if;

496
        

497
        elsif (soma = 27) then

498
        if (clk'event and clk = '1') then

499
        display <= "11111110";

500
        segmento <= "0001111";

501
        end if;        

502
        if (clk'event and clk='0') then

503
        display <="11111101"; 

504
        segmento <= "0010010";

505
        end if;

506
        

507
        elsif (soma = 28) then

508
        if (clk'event and clk = '1') then

509
        display <= "11111110";

510
        segmento <= "1111111";

511
        end if;

512
        if (clk'event and clk='0') then

513
        display <="11111101"; 

514
        segmento <= "0010010";

515
        end if;

516
        

517
        elsif (soma = 29) then

518
        if (clk'event and clk = '1') then

519
        display <= "11111110";

520
        segmento <= "0000100";

521
        end if;        

522
        if (clk'event and clk='0') then

523
        display <="11111101"; 

524
        segmento <= "0010010";

525
        end if;

526
        

527
        elsif (soma = 30) then

528
        if (clk'event and clk = '1') then

529
        display <= "11111110";

530
        segmento <= "0000001";

531
        end if;        

532
       if (clk'event and clk='0') then

533
        display <="11111101"; 

534
        segmento <= "0000110";

535
        end if; 

536
        

537
                                                                                  

538
end if;    

539
  end if;      

540
end process;

541
end Behavioral;


  


  



  

  
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    Re: Multiple Driver Nets _segmento{OBUF[0]
  


  

    

      von
      
        Klakx (Guest)
      
      


      
    


    

      
    

    

    

  
  


  

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normally this error occurs if you drive "segmento" from more than one 
process. But I think you have a real bigger problem with your clock 
description.
1
PROCESS(x, soma, subtracao, chave_sinal, clk)

 shows one problem. There should be a single asynchronous reset like
1
PROCESS(a_reset_n,clk)

 or only synchronous reset and signals. Then your sensitivity list is 
very clear:
1
PROCESS(clk)


The 2nd pitfall in coding metholodgy is the multiple use of the 
rising_edge(clk) (or clk'event ..). Your process should only have one 
use of this like
[vhdl]
process(clk)
begin
   if rising_edge(clk) then
      if (chave_sinal = '1') then
            if (x = 0) then
                if (clk 'event and clk='1') then
                   display <="11111110";
                   segmento <= "0000001";
                end if;
            end if; -- <-- this was also missing?
            else
               display <= "11111101";
               segmento <= "0000001";
            end if;
         [..]
   end if;

of course you have take a 2nd look of your cycle timing after rework
end process;

  


  




  

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    Re: Multiple Driver Nets _segmento{OBUF[0]
  


  

    

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        Lothar M.
            (Company: Titel)
        (lkmiller)
        (Moderator)
      
      


      
    


    

      
    

    

    

  
  


  

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ricardo wrote:
> I do not know where this error is.
The error itself is that you have multiple clocks in one megamonster 
process. Where did you learn this crude design mixed muddled practice? 
It must be your own idea, because I never saw anything roughly similar 
like that..

OK, having cleared that, one question: did you ever do a smaller design 
like a flashing LED or a chasing light?

> use ieee.numeric_std.all;
> use ieee.std_logic_unsigned.all;
> use ieee.std_logic_arith.all;
Never ever use the numeric_std together with the std_logic_arith libs. 
You will encounter some very weird error messages...

ricardo wrote:
> ... I do not know where this error is.
What do you try with that curious piece of code?
Is it some kind of counter on a 7 segment display?

  


  




  

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    Re: Multiple Driver Nets _segmento{OBUF[0]
  


  

    

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        ricardo (Guest)
      
      


      
    


    

      
    

    

    

  
  


  

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I have to do sum and subtraction operations using 8 keys, for each 4bit 
binary number and the result appears on the decimal display. The LED 
indicates whether the result is negative or not

  


  




  

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    Re: Multiple Driver Nets _segmento{OBUF[0]
  


  

    

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        ricardo (Guest)
      
      


      
    


    

      
    

    

    

  
  


  

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Sorry if my code is extensive but I'm new to vhdl and I do not have much 
idea how to do it

Thank you for your help

  


  




  

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    Re: Multiple Driver Nets _segmento{OBUF[0]
  


  

    

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        Lothar M.
            (Company: Titel)
        (lkmiller)
        (Moderator)
      
      


      
    


    

      
    

    

    

  
  


  

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ricardo wrote:
> Port(chaves_a, chaves_b: in std_logic_vector(3 downto 0);
>          led: inout bit;
>         led_1: inout bit;
>         segmento: out bit_VECTOR(0 TO 6);
>         chave_sinal: inout std_logic;
>         clk: in std_logic;
>         display: out bit_VECTOR(7 DOWNTO 0);
>          x: inout integer;
>         subtracao, soma: inout integer);
So, for that exercise for sure you will not need that much ports (BTW: 
using inout ports just for laziness eg. "easy way to read an output 
port" is a reason for being fired...). Simply 2x4 inputs for the 
switches, 7 outputs for the seven segment display, one output for the 
sign led, and one input for the operation (add/subtract). Am I missing 
one?
I don't think so.
You will need no clock because the whole design is completely 
combinatorial.

All in all it could be implemented in a lookup table with 9 inputs and 8 
outputs. So the implementation in a 512x8 RAM would be the most 
efficient way to solve the problem...

  


  



  

  
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    Re: Multiple Driver Nets _segmento{OBUF[0]
  


  

    

      von
      
        Lothar M.
            (Company: Titel)
        (lkmiller)
        (Moderator)
      
      


      
    


    

      
    

    

    

      

      

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The other way will be the more traditional one:
1
LIBRARY ieee;

2
USE ieee.std_logic_1164.ALL;

3
use ieee.numeric_std.all;

4
5
entity colculadora_4bits is

6
Port(chaves_a, chaves_b: in std_logic_vector(3 downto 0);

7
     signled           : out std_logic;

8
     segmento          : out std_logic_vector(6 downto 0); -- Bit 6..0: segment F..A

9
     operation         : in std_logic                      -- 0 = add, 1 = subtract

10
     );

11
end colculadora_4bits;

12
13
architecture Behavioral of colculadora_4bits is

14
signal sresult : signed (3 downto 0);

15
signal uresult : unsigned (3 downto 0);

16
begin

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   -- calculate the result (range -8 to +7)

18
   sresult <= signed(chaves_a) + signed(chaves_b) when operation='0' else

19
              signed(chaves_a) + signed(chaves_b);

20
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   -- display the sign             

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   signled <= sresult(3);

23
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   -- make the remaining number unsigned (range 0 to +8) --> less definitions for display

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   uresult <= unsigned(sresult) when sresult>0 else

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              unsigned(-sresult);

27
   

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   -- display the unsigned number 

29
   with uresult select segmento <= 

30
      "0111111" when "0000",    -- 0

31
      "0000110" when "0001",    -- 1

32
      "1011011" when "0010",

33
      "1001111" when "0011",

34
      "1100110" when "0100",

35
      "1101101" when "0101",

36
      "1111101" when "0110",

37
      "0000111" when "0111",

38
      "1111111" when others;    -- 8

39
   

40
end Behavioral;


And voila: according to the waveform in the testbench its running very 
fine... ;-)

  


  



  

  
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    Re: Multiple Driver Nets _segmento{OBUF[0]
  


  

    

      von
      
        Andreas S.
            (Company: Schweigstill IT)
        (schweigstill)
        
      
      


      
    


    

      
    

    

    

  
  


  

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Lothar M. wrote:
1
>    sresult <= signed(chaves_a) + signed(chaves_b) when operation='0' else

2
>               signed(chaves_a) + signed(chaves_b);


> And voila: according to the waveform in the testbench its running very
> fine... ;-)

Are you sure? ;-)

  


  




  

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    Re: Multiple Driver Nets _segmento{OBUF[0]
  


  

    

      von
      
        Lothar M.
            (Company: Titel)
        (lkmiller)
        (Moderator)
      
      


      
    


    

      
    

    

    

      

      

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Andreas S. wrote:
> Are you sure? ;-)
Oooops, you are right.
With a '-' its working better. Let me say it was a little test...  ;-)

  


  




  

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