Nec Network Controller uPD98502 Manual do Utilizador Página 495
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APPENDIX A MIPS III INSTRUCTION SET DETAILS
Preliminary User’s Manual S15543EJ1V0UM
495
ERET
Exception Return
ERET
CO
1
COP0
0 1 0 0 0 0
0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
ERET
0 1 1 0 0 0
31 26 25 24 6 5 0
61 19 6
Format:
ERET
Description:
ERET is the instruction for returning from an interrupt, exception, or error trap. Unlike a branch or jump instruction,
ERET does not execute the next instruction.
ERET must not itself be placed in a branch delay slot.
If the processor is servicing an error trap (
SR2
= 1), then load the PC from the ErrorEPC register and clear the
ERL
bit of the Status register (
SR2
). Otherwise (
SR2
= 0), load the PC from the EPC register, and clear the
EXL
bit of
the Status register (
SR1
= 0).
When a MIPS16 instruction can be executed, the value of clearing the least significant bit of the EPC or error EPC
register to 0 is loaded to PC. This means the content of the least significant bit is reflected on the ISA mode bit
(internal).
Operation:
32, 64 T: if SR
2
= 1 then
if MIPS16EN = 1 then
PC ← ErrorEPC
63..1
|| 0
ISA MODE ← ErrorEPC
0
else
PC ← ErrorEPC
endif
SR ← SR
31..3
|| 0 || SR
1..0
else
if MIPS16EN = 1 then
PC ← EPC
63..1
|| 0
ISA MODE ← EPC
0
else
PC ← EPC
endif
SR ← SR
31..2
|| 0 || SR
0
endif
Exceptions:
Coprocessor unusable exception
- Preliminary User’s Manual 1
- NOTES FOR CMOS DEVICES 4
- M5D 98. 12 5
- LIST OF FIGURES (1/5) 16
- LIST OF FIGURES (2/5) 17
- LIST OF FIGURES (3/5) 18
- LIST OF FIGURES (4/5) 19
- LIST OF FIGURES (5/5) 20
- LIST OF TABLES (1/2) 21
- LIST OF TABLES (2/2) 22
- CHAPTER 1 INTRODUCTION 23
- 1.1 Features 23
- 1.2 Ordering Information 23
- 1.3 System Configuration 24
- 1.4 Block Diagram (Summary) 25
- 1.5 Block Diagram (Detail) 26
- Ethernet Controller 30
- USB CONTROLLER 31
- Index Mark 33
- Pin Name 34
- 1.7 Pin Function 37
- 1.7.5 Memory interface 39
- 1.7.6 PCI interface 41
- 1.7.7 ATM interface 43
- 1.7.8 Ethernet interface 45
- 1.7.9 USB interface 46
- 1.7.10 UART interface 47
- 1.7.11 Micro Wire interface 47
- 1.7.14 I.C. – open 48
- 1.7.15 I.C.– pull down 48
- 1.7.17 I.C. – pull up 48
- Register 49
- 1.9 Memory Map 53
- 1.10 Reset Configuration 54
- 1.12 Clock Control Unit 56
- 4120A Core 57
- 2.3 Pipeline 84
- If they are 90
- . The result 92
- 2.4 Memory Management System 101
- is then added to the PFN 102
- CHAPTER 2 V 103
- VPN Offset 105
- is passed to 105
- Without TLB mapping 111
- (a) 32-bit mode 118
- (b) 64-bit mode 118
- 1819 031 11 10 121
- 0 MASK 0 121
- 2.5 Exception Processing 129
- 161718192021222324 135
- 0 BEV TS SR 0 CH CE DE 135
- 11111112 135
- 3 2 1 031 139
- PAddr0 0 R W 139
- WatchLo Register 139
- 0 Diagnostic 140
- Cold Reset 142
- (Unmapped, cacheable space) 161
- (Unmapped, uncached space) 161
- (Hardware) 163
- (Software) 163
- 2.6 Initialization Interface 165
- 2.7 Cache Memory 168
- 2.7.6 Cache data integrity 174
- Valid bit Clear 175
- Tag Read to TagLo 176
- W bit Read to TagLo 176
- Data cache only 176
- Tag Write 177
- Write-back (see 179
- Figure 2-84) 179
- Figure 2-84. Writeback Flow 180
- Figure 2-85. Refill Flow 180
- 2.8 CPU Core Interrupts 182
- 3.1 Overview 185
- System Controller 187
- 3.1.10 Data flow diagram 188
- 3.2 Registers 189
- 3.3 CPU Interface 201
- Remark VR 202
- 3.4 Memory Interface 204
- Normal ROM Read Cycle 208
- FLASH M em ory W rite Cycle 208
- ROM Burst Read Cycle 208
- Example (8 MB PROM) 215
- (System Controller) 215
- Example (4 MB FLASH) 215
- SDRAM Configuration 218
- 3.5 IBUS Interface 221
- 3.6 DSU (Deadman’s SW Unit) 224
- Big-Endian 227
- Little-Endian 227
- 4.1 Overview 229
- ATM Cell Processor 230
- 4120A RISC Processor 232
- SDRAM Space 236
- 4.3 Interruption 237
- 4.5 Data Structure 247
- - Tx buffer directory 248
- - Tx link pointer 248
- - Tx buffer descriptor 248
- - Tx packet descriptor 248
- -Tx link pointer 250
- -Tx buffer descriptor 250
- -Rx buffer directory 252
- -Rx link pointer 252
- -Rx buffer descriptor 252
- -Rx pool descriptor 252
- Alert level 253
- 4.6 Initialization 255
- 00_0000H 256
- 0F_FFFFH 256
- 00_2000H 256
- 4.7 Commands 257
- 4.8 Operations 262
- Work RAM (10 Kbytes) 263
- NEXT POINTER 265
- CELL HEADER 265
- PACKET DESCRIPTOR STORAGE 265
- (3) Tx VC table 267
- Figure 4-28. Tx VC Table 267
- (1) Rx VC table 271
- A_MWA[3:0] 276
- A_MTA[3:0] 276
- A_MBA[3:0] 276
- A_MSA[3:0] 276
- 5.1 Overview 277
- Transceiver 278
- Ethernet Controller Block 278
- Register Categories 279
- Tx_FIFO (256 Bytes) 295
- To MAC Control Block 295
- From internal bus 295
- Rx_FIFO (256 Bytes) 297
- To internal bus 297
- From MAC Control Block 297
- 5.3 Operation 300
- Set RCVDP 306
- CHAPTER 6 USB CONTROLLER 309
- 6.1 Overview 309
- 6.2 Registers 311
- 6.3 USB Attachment Sequence 330
- 6.4 Initialization 331
- Data Segment 334
- Tx Packet 335
- -Tx Buffer Directory 336
- -Tx Link Pointer 336
- -Tx Buffer Descriptor 336
- 4120A when transmitting data 338
- Figure 6-7. V 338
- Buffer Directory 345
- -Rx Buffer Directory 346
- -Rx Link Pointer 346
- -Rx Buffer Descriptor 346
- 6.7 Power Management 364
- 6.8 Receiving SOF Packet 367
- Tx data Rx data 368
- 6.10 Example of Connection 369
- CHAPTER 7 PCI CONTROLLER 370
- 7.1 Overview 370
- 7.2 Bus Bridge Functions 371
- CHAPTER 7 PCI CONTROLLER 382
- PCI-Host 384
- Controller 384
- Internal 384
- 7.4 Functions in Host-mode 386
- AD[31:0] 388
- PCI device 388
- Register Name 390
- Register Name Size 402
- 7.5.19.2 Vendor ID register 403
- 7.5.19.3 Device ID register 403
- 7.5.19.4 Command register 404
- 7.5.19.5 Status register 405
- 7.5.19.23 PMCSR register 410
- 7.5.19.24 PMData register 410
- 7.6 Information for Software 411
- NS16550D 414
- 8.3 Registers 415
- CHAPTER 9 TIMER 424
- 9.1 Overview 424
- 9.2 Block Diagram 424
- 9.3 Registers 425
- CHAPTER 10 MICRO WIRE 427
- 10.1 Overview 427
- 10.2 Operations 428
- 10.3 Registers 429
- A.5 CPU Instruction 435
- 0 0 1 0 0 0 437
- Add Immediate Unsi 438
- 6 5555 6 439
- 0 0 1 1 0 0 441
- Branch On Coprocessor 0 False 442
- Branch On Coprocessor 0 True 445
- Opcode Table: 447
- 0 0 0 1 0 0 448
- 0 1 0 1 0 0 449
- 31 26 25 21 20 16 15 0 450
- 0 0 0 1 0 1 462
- 0 1 0 1 0 1 463
- 0 0 0 0 0 0 464
- 0 0 1 1 0 1 464
- Cache (1/4) 465
- Cache (2/4) 466
- Cache (3/4) 467
- Cache (4/4) 468
- 0 1 1 0 0 0 470
- 0 1 1 0 0 1 471
- 31 26 25 21 20 16 15 6 5 0 473
- 655 10 6 473
- Doubleword Divide Unsigned 474
- Divide Unsigned 476
- 6 5 555 6 488
- 31 26 25 24 6 5 0 495
- HIBERNATE 496
- 0 0 0 0 1 0 497
- 0 0 0 0 1 1 498
- Jump And Link Register 499
- Jump And Link Exchange 500
- 31 26 25 21 20 0 501
- 1 0 0 0 0 0 502
- 1 0 0 1 0 0 503
- 1 1 0 1 1 1 504
- Load Doubleword Left (1/3) 505
- Load Doubleword Left (2/3) 506
- Load Doubleword Left (3/3) 507
- Load Doubleword Right (1/3) 508
- Load Doubleword Right (2/3) 509
- Load Doubleword Right (3/3) 510
- 1 0 0 0 0 1 511
- 1 0 0 1 0 1 512
- 0 0 0 0 0 513
- 0 0 1 1 1 1 513
- 1 0 0 0 1 1 514
- Load Word Left (1/3) 515
- Load Word Left (2/3) 516
- Load Word Left (3/3) 517
- Load Word Right (1/3) 518
- Load Word Right (2/3) 519
- Load Word Right (3/3) 520
- Load Word Unsigned 521
- Multiply and Accumulate (1/5) 522
- Multiply and Accumulate (2/5) 523
- Multiply and Accumulate (3/5) 524
- Multiply and Accumulate (4/5) 525
- Multiply and Accumulate (5/5) 526
- 31 26 25 11 1016 15 0 528
- Move To Coprocessor0 530
- Move To HI 531
- Move To LO 532
- 31 26 25 21 20 6 5 0 533
- Or Immediate 537
- 1 0 1 0 0 0 538
- 1 1 1 1 1 1 539
- Store Doubleword Left (1/3) 540
- Store Doubleword Left (2/3) 541
- Store Doubleword Left (3/3) 542
- Store Doubleword Right (1/3) 543
- Store Doubleword Right (2/3) 544
- Store Doubleword Right (3/3) 545
- 1 0 1 0 0 1 546
- Shift Left Logical 547
- Shift Left Logical Variable 548
- 0 0 1 0 1 0 550
- 0 0 1 0 1 1 551
- 31 26 25 6 5 0 560
- 1 0 1 0 1 1 561
- Store Word Left (1/3) 562
- Store Word Left (2/3) 563
- Store Word Left (3/3) 564
- Store Word Right (1/3) 565
- Store Word Right (2/3) 566
- Store Word Right (3/3) 567
- 32, 64 T: SyncOperation ( ) 568
- System Call 569
- Trap If Equal 570
- Trap If Equal Immediate 571
- Probe TLB For Matching Entry 576
- Read Indexed TLB Entry 577
- Write Indexed TLB Entry 578
- Write Random TLB Entry 579
- Trap If Less Than Immediate 581
- Trap If Not Equal 584
- Trap If Not Equal Immediate 585
- 0 0 1 1 1 0 587
- APPENDIX B V 590
- Facsimile 595
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