TI486 Microprocessor - Al Kossow's Bitsavers

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I . ~ -.....J Table 7-17. Instructions, Opcodes, Flags, and Clock Summary (Continued) FLAGS REAL MODE CLOCKS INSTRUCTION OPCODE REG! REG! 0 D I T S Z A P C CACHE CACHE CACHE F F F F F F F F F MISS HIT HIT PROTECTED MODE CLOCKS NOTES CACHE READ PROTECTED MISS MODE MODE CMPS Compare String A [011w] m u u u m m m m m 7 8 7 8 1 2 CMPXCHG Compare and Exchange m u u u m m m m m Register1, Register2 OF B[OOOw] [11 reg2 reg 1 ] 5 5 Memory, Register OF B[OOOw] [mod reg rim] 7 8 7 8 CWD Convert Word to Doubleword 99 u u u u u u u u u 1 1 CWDE Convert Word to Doubleword Extended 98 u u u u u u u u u 3 3 DAA Decimal Adjust AL after Add 27 u u u u m m m m m 4 4 I DAS Decimal Adjust AL after Subtract 2F u u u u m m m m m 4 4 DEC Decrement by 1 m u u u m m m m u 1 2 Register/Memory F [111w] [mod 001 rim] 1/3 5 1/3 5 Register (short form) 4 [1 reg] 1 1 DIV Unsigned Divide F [011w] [mod 110 rim] u u u u u u u u u 1,4 2,4 Accumulator by Register/Memory Divisor: Byte 14/15 17 14/15 17 Word 22/23 24 22/23 24 Ooubleword 38/39 40 38/39 40 ENTER Enter New Stack Frame C8 [8-bit level]§ u u u u u u u u u 1 2 Level = 0 7 7 Level = 1 10 10 10 10 Level (L) > 1 6+4*L 6+4*L 6+4*L 6+4*L HLT Halt F4 u u u u u u u u u 3 3 11 -- -- --- t = immediate data :j: = 8-bit displacement § = 16-bit displacement 11 = 32-bit displacement m = Flag modified u = Flag unchanged Notes: 1) Exception 13 fault (general protection) will occur in Real Mode if an operand reference is made that partially or fully extends beyond the maximum CS, OS, ES, FS, or GS segment limit (FFFFh). Exception 12 fault (stack segment limit violation or not present) will occur in Real Mode if an operand reference is made that partially or fully extends beyond the maximum SS limit. 2) Exception 13 fault will occur if the memory operand in CS, OS, ES, FS, or GS cannot be used due to either a segment limit violation or an access rights violation. If a stack limit is violated, an exception 12 occurs. 3) This is a Protected Mode instruction. Attempted execution in Real Mode will result in exception 6 (invalid opcode). 4) An exception may occur, depending on the value of the operand. 5) LOCK is asserted during descriptor table accesses. 6) <strong>Al</strong>l segment descriptor accesses in the GOT or LOT made by this instruction will automatically assert LOCK to maintain descriptor integrity in multiprocessor systems. 7) JMP, CALL, INT, RET, and IRET instructions referring to another code segment will cause an exception 13, if an applicable privilege rule is violated. 8) The destination of a JMP, CALL, INT, RET, or IRET must be in the defined limit of a code segment or an exception 13 fault will occur. 9) An exception 13 fault occurs if CPL is greater than IOPL. 10) This instruction may be executed in Real Mode. in Real Mode, its purpose is primarily to initialize the CPU for Protected Mode. 11) An exception 13 fault occurs if CPL is greater than 0 (0 is the most privileged level). Q ~ ~ ~ I ~
~ (X) Table 7-17. Instructions, Opcodes, Flags, and Clock Summary (Continued) INSTRUCTION OPCODE FLAGS 0 D I T S Z F F F F F F IDIV Integer (Signed) Divide u u u u u u Accumulator by Register/Memory F [011w] [mod 111 rIm] Divisor: Byte Word Doubleword IMUL Integer (Signed) Multiply m u u u u u Accumulator by Register/Memory F [011w] [mod 101 rIm] Multiplier: Byte Word Doubleword Register with Register/Memory OF AF[mod reg rIm] Multiplier: Byte Word Doubleword Register/Memory with Immediate to Register2 6 [1 Os1] [mod reg r/m]t Multiplier: Byte Word Doubleword A F u u P F u u C F u m REAL MODE CLOCKS REG! CACHE CACHE MISS HIT 19/20 22 27/28 29 43/44 47 3/5 7 3/5 7 7/9 13 3/5 7 3/5 7 7/9 13 3/5 7 3/5 7 7/9 13 PROTECTED MODE CLOCKS REGI CACHE CACHE MISS HIT 19/20 22 27/28 29 43/44 47 3/5 7 3/5 7 7/9 13 3/5 7 3/5 7 7/9 13 3/5 7 3/5 7 7/9 13 READ MODE 1,4 1 NOTES PROTECTED MODE 2,4 2 ~ ~ ~ ~ C/) § ~ -< IN Input from liD Port u u u u u u Fixed Port E [01 Ow] [port number] Variable Port E [11 Ow] u u u 16 16 16 16 6/19 6/20 6/19 6/20 9 INC Increment by 1 m u u u m m Register/Memory F [111w] [mod 000 rIm] Register (short from) 4 [0 reg] m m u 1/3 5 1 1/3 5 1 1 2 INS Input String from liD Port 6 [110w] u u u u u u u u u 20 20 6/19 6/20 1 2,9 s- CI) ~ ~ g. :J ~ INT Software Interrupt u m 0 u u u INTi CD[i] Protected Mode: Interrupt or Trap to Same Privilege Interrupt or Trap to Different Privilege 16-Bit Task to 16-bit TSS by Task Gate 16-Bit Task to 32-bit TSS by Task Gate 16-Bit Task to V86 Task by Task Gate 32-Bit Task to 16-bit TSS by Task Gate 32-Bit Task to 32-bit TSS by Task Gate 32-Bit Task to V86 Task by Task Gate V86 to 16-bit TSS by Task Gate V86 to 32-bit TSS by Task Gate V86 to Privilege 0 by Trap Gatellnt Gate C0r'ltinued on n~xt pagE!--"--"--"---- u u u 14 16 57 58 91 92 265 266 296 320 177 205 241 261 299 343 180 232 241 261 299 343 106 114 1,4 5,6,7,8
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.TEXAS INSTRUMENTS TI486 Microproce
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TI486 Microprocessor Reference Guid
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Preface Read This First About This
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About This Manual Appendix D Orderi
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Contents 1 Product Overview .......
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Contents 5.5 AC Characteristics . .
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1-1 TI486SLC/E Functional Block Dia
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Figures 4-27 SUSP Initiated Suspend
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Tables 5-3 Absolute Maximum Ratings
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Product Overview 1-1
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Chapter 1 Product Overview Features
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1.2 Differences Between the TI486SL
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Tl486SLCIE Overview Figure 1-2. TI4
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Tl486DLCIE Overview 1.4 TI486DLC/E
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TI486DLCIE Overview The TI486DLC/E
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Power Management / System Managemen
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Programming Interface 2-1
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Chapter 2 In this chapter, the inte
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Processor Initialization Table 2-1.
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Instruction Set Overview 2.2 Instru
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Register Set 2.3 Register Set There
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Register Set Pointer and Index Regi
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Register Set 2.3.1.2 Segment Regist
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Register Set 2.3.1.3 Instruction Po
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Register Set 2.3.2 System Register
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Register Set 2.3.2.1 Control Regist
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Register Set 2.3.2.2 Descriptor Tab
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Register Set Table 2-6. Segment Des
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Register Set During task switching,
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Register Set The CCRO register (Tab
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Register Set Table 2-9. TI486DLCIE
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Register Set Table 2-12. ARR 1-ARR4
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Register Set 2.3.2.6 Test Registers
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Register Set Table 2-14. TR6 and TR
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Address Spaces 2.4 Address Spaces T
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Address Spaces 2.4.2 Memory Address
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Address Spaces Figure 2-21. Real Mo
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Address Spaces Figure 2-24. Paging
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Interrupts and Exceptions 2.5 Inter
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Interrupts and Exceptions 2.5.3 Int
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Interrupts and Exceptions Table 2-2
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System Management Mode 2.6 System M
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System Management Mode Figure 2-29.
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System Management Mode The new SMM
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System Management Mode During SMM o
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Protection The Current Privilege Le
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Virtual 8086 Mode 2.9 Virtual 8086
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TI486SLC/E Bus Interface 3-1
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Chapter 3 TI486SLC/E Bus Interface
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Overview Table 3-1. TI486SLCIE Sign
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Overview Table 3-2. Terminal Functi
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Overview 3.1.1 Bus Cycle Definition
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Overview Table 3-5 shows the state
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Functional Timing Figure 3-3. Bus A
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Functional Timing 3.2.2.1 Bus Cycle
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Functional Timing Non-Pipelined Wai
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Functional Timing Because of the de
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Functional Timing Pipelined Wait St
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Functional Timing Initiating and Ma
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Functional Timing Figure 3-12. Comp
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Functional Timing Figure 3-13. Inte
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Functional Timing Shutdown Indicati
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Functional Timing Figure 3-17. Pipe
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Functional Timing As shown in Figur
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Functional Timing Figure 3-19. Requ
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Functional Timing Figure 3-22. 8MI
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Functional Timing HALT Initiated Su
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Functional Timing 3.2.12 Float Figu
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TI486DLC/E Bus Interface 4-1
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Chapter 4 TI486DLC/E Bus Interface
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Overview Table 4-1. TI486DLCIE SIgn
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Overview Table 4-6. Signal States D
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Overview 4.1.2 Power Management 4.1
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Functional Timing 4.2 Functional Ti
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Functional Timing The TI486DLC/E da
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Functional Timing Non-Pipelined Rea
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Functional Timing Initiating and Ma
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Functional Timing Figure 4-8. Faste
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Functional Timing Figure 4-9. Vario
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Functional Timing Once a pipelined
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Functional Timing 4.2.3 Bus Cycles
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Functional Timing Pipelined Cycles
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Functional Timing LOCK is activated
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Functional Timing 4.2.6 Halt and Sh
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Functional Timing Figure 4-17. Pipe
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Functional Timing Figure 4-19. Non-
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Functional Timing The TI486DLC/E sa
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Functional Timing 4.2.9 Hold Acknow
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Functional Timing 4.2.10 Coprocesso
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Functional Timing 4.2.12 Power Mana
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Functional Timing Stopping the Inpu
Page 198 and 199: Electrical Specifications 5-1
Page 200 and 201: Chapter 5 Electrical Specifications
Page 202 and 203: ElectricalConnecnons It is recommen
Page 204 and 205: Recommended Operating Conditions 5.
Page 206 and 207: DC Electrical Characteristics Table
Page 208 and 209: AC Characteristics Figure 5-2. TI48
Page 210 and 211: AC Characteristics Table 5-9. AC Ch
Page 212 and 213: AC Characteristics Table 5-11. AC C
Page 214 and 215: ____ AC Characteristics 5.5.3 RESET
Page 220 and 221: Mechanical Specifications 6-1
Page 222 and 223: Chapter 6 Mechanical Specifications
Page 224 and 225: Pin Assignments Table 6-1. TI486SLC
Page 226 and 227: Pin Assignments Figure 6-3. TI486DL
Page 228 and 229: Package Dimensions 6.2 Package Dime
Page 230 and 231: Thermal Characteristics 6.3 Thermal
Page 232 and 233: Instruction Set 7-1
Page 234 and 235: Chapter 7 Instruction Set This sect
Page 236 and 237: Instruction Fields 7.2 Instruction
Page 238 and 239: Instruction Fields 7.2.5 reg Field
Page 240 and 241: Instruction Fields Table 7-7. mod r
Page 242 and 243: Instruction Fields 7.2.11 sreg3 Fie
Page 244 and 245: Clock Count Summary 7.4 Clock Count
Page 246 and 247: --- --;.J -L 01 Table 7-17. Instruc
Page 250 and 251: Table 7-17. Instructions, Opcodes,
Page 254 and 255: -....J N (J.) Table 7-17. Instructi
Page 256 and 257: I I i I i Table 7-17. Instructions,
Page 258 and 259: ...... ...... '" Table 7-17. Instru
Page 260 and 261: -....J N co Table 7-17. Instruction
Page 262 and 263: "-.I ~ Table 7-17. Instructions, Op
Page 266 and 267: U Appendix A TI486 SMM Pro rammer's
Page 268 and 269: SMM Implementation A.2 SMM Implemen
Page 270 and 271: Figure A-1. SMM Memory Space Header
Page 272 and 273: SMM Implementation 6) NMI is the on
Page 274 and 275: Instruction Summary A.4 Instruction
Page 276 and 277: Instruction Summary A.4.3 Resume No
Page 278 and 279: Instruction Summary A.4.6 Save LDTR
Page 280 and 281: 8MI Handler Example A.5 SMI Handler
Page 282 and 283: 8MI Handler Example execute_halt: C
Page 284 and 285: 8MI Handler Example COMMENT A The T
Page 286 and 287: 8MI Handler Example arrl arr2 arr3
Page 288 and 289: .MODEL SMALL . STACK .386P INCLUDE
Page 290 and 291: Testing/Debugging SMM Code sgdt COM
Page 292 and 293: Testing/Debugging SMM Code i*******
Page 294 and 295: TI486 Power Management Features A.7
Page 296 and 297: Detection of Tl486 CPU A.9 Detectio
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Detection of SMM Capable Version A.
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i**********************************
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A.11 SMM Feature Comparison SMM Fea
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SMM Instruction Macros COMMENT A Co
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SMM Instruction Macros SMM Instruct
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A.14 Format of Data Used by SVDC/RS
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Altering SMM Code Limits A.1S Alter
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SMM Errata A.16 SMM Errata The foll
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Appendix B TI486 Cache Flush B.1 Ge
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Appendix C TI486 BIOS Modification
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Introduction Some example assembler
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Appendix D Ordering Information 0.1
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~TEXAS INSTRUMENTS Printed in U.S.A
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