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6-29
BUS INTERFACE UNIT
Figure 6-11. Basic Refresh Cycle
A2491-02
LOCK#
D15:0
CLK2
BHE#, BLE#
M/IO#, D/C#
Valid 1
RD#
READY#
Ti T1 T2 Ti T1 T2 T2 Ti Ti T1
Cycle 1
Nonpipelined
External
(Read)
Cycle 2
Refresh
CLKOUT
Idle Idle Cycle 3
Nonpipelined
External
(Write)
[Late Ready]
T2
Valid 3
ADS#
NA#
A25:1
W/R#
WR#
LBA#
Idle
REFRESH#
Float
HOLD
HLDA
In
Out
Valid 1
Valid 2
Valid 1 Valid 2
Valid 3
- Intel386 1
- Embedded Microprocessor 1
- User’s Manual 1
- Intel386 EX 2
- Embedded 2
- Microprocessor 2
- User’s Manual 2
- GUIDE TO THIS 26
- CHAPTER 1 28
- GUIDE TO THIS MANUAL 28
- Packaging 32
- ARCHITECTURAL 36
- OVERVIEW 36
- CHAPTER 2 38
- ARCHITECTURAL OVERVIEW 38
- A2849-02 39
- 2.2 INTEGRATED PERIPHERALS 40
- IEEE Standard Test 41
- CORE OVERVIEW 42
- CHAPTER 3 44
- A2850-01 45
- REGISTER 50
- ORGANIZATION 50
- CHAPTER 4 52
- SYSTEM REGISTER ORGANIZATION 52
- A2499-02 55
- A2495-02 61
- A2496-02 63
- A2502-02 65
- CONFIGURATION 72
- CHAPTER 5 74
- A2535-01 75
- • A timer (OUT1, OUT2) 76
- A2517-03 85
- A2518-02 91
- A3380-01 93
- 5.2.7 Core Configuration 94
- DEVICE CONFIGURATION 100
- • Interrupt Control Unit: 101
- • Timer Control Unit: 101
- BUS INTERFACE 112
- CHAPTER 6 114
- BUS INTERFACE UNIT 114
- 6.1.1 Bus Signal Descriptions 116
- A2305-02 119
- A2484-02 121
- Figure 6-3. Ready Logic 124
- A2486-03 125
- A2488-02 131
- READY# Asserted • 133
- HOLD Asserted 133
- • NA# is ignored 136
- Figure 6-10. Halt Cycle 140
- A2493-02 143
- 6.3.7.1 Write Cycles 144
- 6.3.7.2 Read Cycles 144
- A3375-01 146
- 6.6.1.1 System Configuration 152
- A2854-02 155
- A3265-02 157
- MANAGEMENT 158
- CHAPTER 7 160
- SYSTEM MANAGEMENT MODE 160
- A2510-02 164
- A2512-02 165
- 7.3.2.1 SMI# Priority 166
- A2508-01 167
- A2509-01 168
- A2511-02 169
- A2505-02 170
- A2507-01 171
- 7.3.4.2 SMRAM State Dump Area 173
- CLOCK AND 180
- CHAPTER 8 182
- A2470-02 183
- A2229-03 186
- 8.4.2.1 Built-in Self Test 193
- 8.4.2.2 JTAG Reset 193
- INTERRUPT 198
- CONTROL UNIT 198
- CHAPTER 9 200
- INTERRUPT CONTROL UNIT 200
- 9.2.2.2 Determining Priority 206
- A2428-01 211
- • A poll command is issued 213
- A2430-01 228
- Data Bus 228
- Vector Number 228
- IR (Valid) 229
- IR sampled on this edge 229
- IR (Spurious) 229
- A2857-01 230
- // Vector Table 238
- TIMER/COUNTER 242
- CHAPTER 10 244
- TIMER/COUNTER UNIT 244
- A2317-02 245
- Table 10-1. TCU Signals 246
- A2395-02 251
- A2312-02 252
- • A gate trigger 253
- • The counter reaches one 253
- A2400-01 257
- ????864286410 258
- A2315-01 259
- A2316-01 261
- Table 10-4. GATE 263
- Connection Options 263
- 10.3.4.1 Simple Read 270
- Figure 10-28. Timer 272
- Register (TMR 272
- – Read Format) 272
- Figure 10-30. Timer 275
- – Status Format) 275
- • With the readback command: 277
- ASYNCHRONOUS 286
- SERIAL I/O UNIT 286
- CHAPTER 11 288
- ASYNCHRONOUS SERIAL I/O UNIT 288
- A2519-02 289
- 11.1.1 SIO Signals 290
- Figure 11-2. SIO 291
- Table 11-1. SIO Signals 291
- Figure 11-3. SIO 294
- Transmitter 294
- Figure 11-4. SIO 295
- Figure 11-5. SIO 296
- Receiver 296
- A2525-02 298
- 11.2.6.2 SIO DMA sources 300
- 11.3 REGISTER DEFINITIONS 302
- = 1–3]) 304
- and DLH 309
- CONTROLLER 334
- CHAPTER 12 336
- DMA CONTROLLER 336
- A2531-02 337
- 12.1.2 DMA Signals 339
- 12.2.2.1 Fly-By Mode 340
- 12.2.2.2 Two-Cycle Mode 341
- A3381-01 343
- A2480-02 344
- A2332-02 351
- A2333-02 355
- A2338-02 357
- A2336-02 359
- Figure 12-17. Cascade Mode 361
- 12.3 REGISTER DEFINITIONS 363
- (read format) 378
- (Address) 385
- Command Functions 385
- DWORD lAddress; 390
- SYNCHRONOUS 398
- CHAPTER 13 400
- SYNCHRONOUS SERIAL I/O UNIT 400
- A2435-02 401
- A2436-02 402
- 13.1.1 SSIO Signals 403
- Baud-rate Value 405
- A3398-01 409
- (Enabled when Clock is High) 410
- (Enabled when Clock is Low) 410
- 13.2.2.2 Autotransmit Mode 411
- 13.2.2.3 Slave Mode 411
- A3397-01 413
- 13.3 REGISTER DEFINITIONS 415
- (BCLKIN) 417
- SSIO Example Code 425
- CHIP-SELECT 434
- CHAPTER 14 436
- CHIP-SELECT UNIT 436
- A2534-01 439
- A2392-02 447
- ADH, UCSADH) 452
- ADL, UCSADL) 453
- MSKH, UCSMSKH) 454
- MSKL, UCSMSKL) 455
- REFRESH 460
- CHAPTER 15 462
- REFRESH CONTROL UNIT 462
- 15.4 REGISTER DEFINITIONS 467
- INPUT/OUTPUT 478
- CHAPTER 16 480
- INPUT/OUTPUT PORTS 480
- 16.1.1 Port Functionality 481
- Table 16-1. Pin Multiplexing 484
- 16.2 REGISTER DEFINITIONS 485
- 16.4.1 I/O Ports Code Example 490
- WATCHDOG 494
- TIMER UNIT 494
- CHAPTER 17 496
- WATCHDOG TIMER UNIT 496
- A2330-02 497
- Table 17-1. WDT Signals 498
- 17.4 REGISTER DEFINITIONS 502
- JTAG TEST-LOGIC 512
- CHAPTER 18 514
- JTAG TEST-LOGIC UNIT 514
- A2340-01 515
- A2356-01 519
- × 2 cells) 522
- 18.4 TIMING INFORMATION 525
- DESCRIPTIONS 528
- APPENDIX A 530
- SIGNAL DESCRIPTIONS 530
- COMPATIBILITY 540
- WITH THE PC/AT* 540
- ARCHITECTURE 540
- APPENDIX B 542
- COMPATIBILITY WITH THE PC/AT* 542
- MASTER# 544
- (From PC/AT* Bus) 544
- Processor 544
- EXAMPLE CODE 548
- HEADER FILES 548
- APPENDIX C 550
- EXAMPLE CODE HEADER FILES 550
- C.2 EXAMPLE CODE DEFINES 555
- REGISTER QUICK 564
- REFERENCE 564
- APPENDIX D 566
- D.2 CLKPRS 572
- ADH (UCSADH) 573
- ADL (UCSADL) 574
- MSKH (UCSMSKH) 575
- MSKL (UCSMSKL) 576
- AND DLH 577
- D.8 DMABSR 578
- D.9 DMACFG 579
- D.10 DMACHR 580
- D.11 DMACMD1 581
- D.12 DMACMD2 582
- D.13 DMAGRPMSK 583
- D.14 DMAIEN 584
- D.15 DMAIS 585
- D.16 DMAMOD1 586
- D.17 DMAMOD2 587
- D.18 DMAMSK 588
- D.20 DMAOVFE 590
- D.21 DMASRR 591
- (write format) 591
- D.22 DMASTS 592
- D.23 ICW1 (MASTER AND SLAVE) 593
- D.24 ICW2 (MASTER AND SLAVE) 594
- D.25 ICW3 (MASTER) 594
- D.26 ICW3 (SLAVE) 595
- D.27 ICW4 (MASTER AND SLAVE) 595
- D.28 IDCODE 596
- D.29 IER 597
- D.30 IIR 598
- D.31 INTCFG 599
- D.33 LCR 601
- D.34 LSR 602
- D.35 MCR 603
- D.36 MSR 604
- D.37 OCW1 (MASTER AND SLAVE) 605
- D.38 OCW2 (MASTER AND SLAVE) 606
- D.39 OCW3 (MASTER AND SLAVE) 607
- D.40 P1CFG 608
- D.41 P2CFG 609
- D.42 P3CFG 610
- D.43 PINCFG 611
- D.47 POLL (MASTER AND SLAVE) 614
- D.48 PORT92 615
- D.49 PWRCON 616
- D.50 RBR 617
- D.51 REMAPCFG 618
- D.52 RFSADD 619
- D.53 RFSBAD 619
- D.54 RFSCIR 620
- D.55 RFSCON 620
- D.56 SCR 621
- D.57 SIOCFG 622
- D.58 SSIOBAUD 623
- D.59 SSIOCON1 624
- D.60 SSIOCON2 625
- D.61 SSIOCTR 626
- D.62 SSIORBUF 626
- D.63 SSIOTBUF 627
- D.64 TBR 627
- D.65 TMRCFG 628
- D.66 TMRCON 629
- D.67 TMR 630
- D.72 WDTCNTH AND WDTCNTL 633
- D.73 WDTRLDH AND WDTRLDL 634
- D.74 WDTSTATUS 635
- INSTRUCTION SET 636
- APPENDIX E 638
- INSTRUCTION SET SUMMARY 638
- Wait states: 639
- Instruction Format 640
- Clock Count Notes 640
- ≤ IOPL. If CPL 658
- GLOSSARY 670
- Glossary-2 673
- Glossary-4 675
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