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Instruction Cycle TimingTable 16-16 Advanced SIMD integer multiply instructions (continued)Instruction Register format Cycles Source Result1 2 3 4 1 2VMLA aVMLS aDd,Dn,Dm(.8 normal)(.16 normal)1 Dn:N2 Dm:N2 Dd:N3 - Dd:N6 -Qd,Qn,Qm(.8 normal)12QnLo:N2QnHi:N2QmLo:N2QmHi:N2QdLo:N3QdHi:N3--QdLo:N6QdHi:N6--(.16 normal)Dd,Dn,Dm(.32 normal)12Dn:N2-Dm:N1-Dd:N3 ---Dd:N6--Qd,Qn,Qm(.32 normal)1234QnLo:N2-QnHi:N2-QmLo:N1-QmHi:N1-QdLo:N3-QdHi:N3------QdLo:N6-QdHi:N6----VMLA aVMLS aVQDMLA aVQDMLS aVMULVQDMLHVQRDMLHQd,Dn,Dm(.16.8 long)(.32.16 long)Qd,Dn,Dm(.64.32 long)Dd,Dn,Dm[x](.16 scalar)Qd,Qn,Dm[x](.16 scalar)1 Dn:N2 Dm:N2 QdLo:N3 QdHi:N3 QdLo:N6 QdHi:N612Dn:N2-Dm:N1-QdLo:N3-QdHi:N3--QdLo:N61 Dn:N2 Dm:N1 - - Dd:N6 -12QnLo:N2QnHi:N2Dm:N1 - - QdLo:N6QdHi:N6-QdHi:N6-Dd,Dn,Dm[x](.32 scalar)12Dn:N2-Dm:N1------Dd:N6--Qd,Qn,Dm[x](.32 scalar)1234QnLo:N2-Qnhi:N2-Dm:N1------------QdLo:N6-QdHi:N6----16-26 Copyright © 2006-2008 ARM Limited. All rights reserved. ARM DDI 0344E
Instruction Cycle TimingTable 16-16 Advanced SIMD integer multiply instructions (continued)Instruction Register format Cycles Source Result1 2 3 4 1 2VMULVQDMULQd,Dn,Dm[x](.32.16 long scalar)1 Dn:N2 Dm:N1 - - QdLo:N6 QdHi:N6Qd,Dn,Dm[x](.64.32 long scalar)12Dn:N2-Dm:N1------QdLo:N6-QdHi:N6VMLA aVMLS aDd,Dn,Dm[x](.16 scalar)1 Dn:N2 Dm:N1 Dd:N3 - Dd:N6 -Qd,Qn,Dm[x](.16 scalar)12QnLo:N2QnHi:N2Dm:N1-QdLo:N3QdHi:N3--QdLo:N6QdHi:N6--Dd,Dn,Dm[x](.32 scalar)12Dn:N2-Dm:N1-Dd:N3----Dd:N6--Qd,Qn,Dm[x](.32 scalar)1234QnLo:N2-QnHi:N2-Dm:N1---QdLo:N3-QdHi:N3------QdLo:N6-QdHi:N6----VMLA aVMLS aVQDMLA aVQDMLS aQd,Dn,Dm[x](.32.16 long scalar)Qd,Dn,Dm[x](.64.32 long scalar)1 Dn:N2 Dm:N1 QdLo:N3 QdHi:N3 QdLo:N6 QdHi:N612Dn:N2-Dm:N1-QdLo:N3-QdHi:N3--QdLo:N6-QdHi:N6a. A multiply, VMUL or VQDMUL, followed by a multiply-accumulate, VMLA, VMLS, VQDMLA, VQDMLS, or a multiply-accumulatefollowed by another multiply-accumulate with a dependency on the accumulator, Dd or Qd, and the result of the firstinstruction and the accumulator of the second instruction data type match, triggers a special accumulator forwarding. Thisenables both instructions to issue back-to-back because the result of the first instruction in N5 can be forwarded to theaccumulator of the second instruction in N4. If this accumulator forwarding is not used, Dd or Qd is required in N3.ARM DDI 0344E Copyright © 2006-2008 ARM Limited. All rights reserved. 16-27
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Cortex -A8Revision: r2p2Technical R
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Product StatusThe information in th
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ContentsCortex-A8 Technical Referen
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Contents7.8 Parity detection ......
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ContentsA.2 ATB interface .........
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List of TablesCortex-A8 Technical R
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List of TablesTable 3-103 Results o
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List of TablesTable 12-1 Access to
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List of TablesTable 15-3 CTI regist
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List of Tablesxx Copyright © 2006-
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List of FiguresFigure 3-10 Memory M
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List of FiguresFigure 10-13 Retenti
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List of FiguresFigure 15-16 CTI Cha
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PrefaceAbout this manualThis is the
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PrefaceChapter 16 Instruction Cycle
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PrefacePrefix CPrefix HPrefix nPref
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PrefaceFeedbackARM welcomes feedbac
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Introduction1.1 About the processor
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Introduction1.3 Components of the p
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Introduction1.3.4 Load/storeThe loa
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Introduction1.4 External interfaces
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Introduction1.6 Power managementThe
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Introduction1.8 Product revisionsTh
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Introduction1-14 Copyright © 2006-
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Programmer’s Model• Hardware co
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Programmer’s Model2.2 Thumb-2 ins
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Programmer’s Model2.3 ThumbEE ins
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Programmer’s ModelThumbEE Handler
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Programmer’s Model2.4 Jazelle Ext
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Programmer’s Model— the registe
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Programmer’s ModelNonsecureSecure
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Programmer’s Model2.7 VFPv3 archi
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Programmer’s Model2.9 Data typesT
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Programmer’s ModelBitHigher addre
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Programmer’s Model2.12 Operating
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Programmer’s ModelIn privileged m
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Programmer’s Model16 generalpurpo
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Programmer’s ModelIn ARM state, y
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Programmer’s Model2.14.5 The GE[3
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Programmer’s ModelT bitThe T bit
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Programmer’s ModelOnly secure pri
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Programmer’s Model2.15.2 Leaving
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Programmer’s ModelAn internal or
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Programmer’s ModelImprecise data
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Programmer’s ModelNoteIf the Embe
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Programmer’s Model2.16 Software c
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Programmer’s Model2.17.2 Security
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Programmer’s Model2.18 Control co
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System Control Coprocessor3.1 About
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System Control CoprocessorTable 3-1
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System Control CoprocessorSecurity
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System Control Coprocessor3.1.6 Sys
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System Control CoprocessorThe TCM T
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System Control CoprocessorFigure 3-
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System Control Coprocessor31 28 27
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System Control Coprocessor3.2.20 c0
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System Control Coprocessora. An ent
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System Control CoprocessorThe Auxil
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System Control CoprocessorBits Fiel
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System Control Coprocessora. n is t
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System Control CoprocessorMRC p15,
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System Control CoprocessorVA to PA
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System Control CoprocessorInvalidat
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System Control CoprocessorThe PMNC
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System Control CoprocessorCWhen wri
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System Control Coprocessorb. The EN
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System Control CoprocessorCWhen rea
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System Control Coprocessor• acces
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System Control CoprocessorYou can c
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System Control CoprocessorIf the op
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System Control CoprocessorTo access
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System Control Coprocessora. An ent
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System Control CoprocessorTo access
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System Control CoprocessorThe PLE I
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System Control CoprocessorTo perfor
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System Control CoprocessorLDR R1, =
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System Control CoprocessorLDR R1, =
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System Control CoprocessorL1 Data 0
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System Control CoprocessorInstructi
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System Control CoprocessorParity/EC
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System Control CoprocessorL2 parity
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System Control CoprocessorThe L2 da
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Chapter 4Unaligned Data and Mixed-e
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Unaligned Data and Mixed-endian Dat
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Unaligned Data and Mixed-endian Dat
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Chapter 5Program Flow PredictionThi
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Program Flow Prediction5.2 Predicte
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Program Flow Prediction5.2.1 Return
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Program Flow Prediction5.4 Guidelin
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Program Flow Prediction5.6 Operatin
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Chapter 6Memory Management UnitThis
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Memory Management Unit6.2 Memory ac
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Memory Management Unit6.4 MMU inter
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Memory Management Unit6.6 TLB lockd
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Chapter 7Level 1 Memory SystemThis
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Level 1 Memory System7.2 Cache orga
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Level 1 Memory System7.3 Memory att
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Level 1 Memory SystemTable 7-1 Memo
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Level 1 Memory System7.5 Data cache
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Level 1 Memory SystemAn exception t
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Level 1 Memory System7.8 Parity det
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Chapter 8Level 2 Memory SystemThis
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Level 2 Memory System8.2 Cache orga
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Level 2 Memory System8.3 Enabling a
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Level 2 Memory SystemControl Regist
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Level 2 Memory System8.4.4 Memory r
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Level 2 Memory System8.5 Synchroniz
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Level 2 Memory System8.6 Locked acc
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Chapter 9External Memory InterfaceT
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External Memory Interfaceto the wri
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External Memory InterfaceTable 9-2
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External Memory Interface9.3 AXI in
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External Memory InterfaceBWBCNoTTSS
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Chapter 10Clock, Reset, and Power C
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Clock, Reset, and Power Controlfami
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Clock, Reset, and Power Control10.2
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Clock, Reset, and Power Control•
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Clock, Reset, and Power Control2. F
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Clock, Reset, and Power ControlNote
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Clock, Reset, and Power ControlAfte
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Clock, Reset, and Power Control•
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Clock, Reset, and Power Control—
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Clock, Reset, and Power ControlThe
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Clock, Reset, and Power ControlPowe
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Clock, Reset, and Power ControlTo p
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Clock, Reset, and Power ControlPowe
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Clock, Reset, and Power ControlATBI
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Clock, Reset, and Power Control7. P
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Chapter 11Design for TestThis chapt
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Design for Test11.1.2 MBIST registe
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Design for Testdseed[3:0]Write the
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Design for TestNoteOnly arrays with
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Design for Test• read and write l
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Design for TestTable 11-10 Selectin
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Design for TestTable 11-15 shows ho
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Design for TestArrayFail[22:0] fail
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Design for TestWhen testing the tag
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Design for Test• Bitmap test mode
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Design for TestCLKARESETnMBISTMODEM
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Design for TestCLKARESETnMBISTMODEM
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Design for TestTable 11-19 shows th
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Design for TestNoteNormal MBIST tes
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Design for TestRowmaxmax - 11 1 1 1
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Design for Test2. R, W_, R_, incr.3
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Design for TestRow3210Addressingdir
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Design for TestRow32100 00 00 00 00
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Design for Test11.2 ATPG test featu
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Design for TestWBR in place of the
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Design for TestOne methodology for
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Chapter 12DebugThis chapter describ
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Debug12.1.3 Debug targetThe debug t
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DebugWhen execution of a monitor ta
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Debug12.3 Debug register interfaceY
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DebugTable 12-3 Debug memory-mapped
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Debug12.3.6 Power domains and debug
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DebugLocks permissionYou can lock t
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DebugTable 12-6 shows the behavior
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Debug12.4 Debug register descriptio
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DebugTable 12-11 shows how the bit
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DebugThe Debug Self Address Offset
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DebugBits Field FunctionTable 12-14
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DebugBits Field Function[9] - Reser
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DebugThe DTR access mode can be one
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DebugBitsFieldFunctionTable 12-16 s
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DebugTable 12-17 Vector Catch Regis
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Debug31 3 2 1 0ReservedNot write-th
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DebugTable 12-23 Breakpoint Control
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Debug12.4.16 Watchpoint Control Reg
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DebugTable 12-26 Watchpoint Control
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DebugNoteOn system reset, PRSR[1] r
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DebugTable 12-32 Management registe
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DebugFigure 12-19 shows the bit arr
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Debug12.5.5 Integration Mode Contro
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Debug12.5.8 Lock Access RegisterThe
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Debug31 8 7 6 5 4 3 2 1 0ReservedSe
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DebugTable 12-44 Peripheral Identif
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DebugTable 12-50 shows how the bit
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Debug12.6.2 Halting debug event•
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Debug12.6.5 Watchpoint debug events
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DebugNoteThe Data Abort handler che
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DebugIf the debugged code is not ru
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DebugTable 12-54 shows the read PC
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Debug12.8.4 Writing to the CPSR in
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DebugCoprocessor instructionsThe ru
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DebugSVCSMCUndefinedThe processor i
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Debug12.9 Cache debugThere are seve
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Debug12.10 External debug interface
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DebugDBGROMADDRThe DBGROMADDR signa
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Debug4. Issue an Instruction Synchr
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Debug12.11.1 Debug communications c
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DebugDebugger access to the DCCA de
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DebugTable 12-58 Values to write to
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Debug}when 1:byte_address_select :=
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DebugNoteIn Example 12-10 on page 1
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Debug12.11.5 Debug state exitWhen e
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DebugExample 12-15 Reading the PCRe
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DebugExample 12-19 Checking for an
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DebugExample 12-22 shows the sequen
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Debug}dscr := ReadDebugRegister(34)
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Debug}scr := (scr | 1);WriteCPReg(1
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DebugIf on a power-down request fro
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Debug; Step 2. Loop writing words f
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Chapter 13NEON and VFP Programmer
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NEON and VFP Programmer’s Modelre
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NEON and VFP Programmer’s ModelS0
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NEON and VFP Programmer’s ModelBa
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NEON and VFP Programmer’s ModelFC
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NEON and VFP Programmer’s ModelTa
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NEON and VFP Programmer’s Model31
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NEON and VFP Programmer’s ModelCo
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Chapter 14Embedded Trace MacrocellT
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Embedded Trace Macrocell14.1.2 The
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Embedded Trace Macrocell(DAP) throu
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Embedded Trace MacrocellTable 14-1
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Embedded Trace MacrocellRegister na
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Embedded Trace MacrocellSee the ETM
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Embedded Trace Macrocell14.5 Precis
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Embedded Trace MacrocellThe followi
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Embedded Trace Macrocellcomparator
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Embedded Trace Macrocell14.8 Instru
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Embedded Trace MacrocellWhen a WFI
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Embedded Trace MacrocellYou can use
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Chapter 15Cross Trigger InterfaceTh
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Cross Trigger Interface• An input
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Cross Trigger Interface15.1.2 The c
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Cross Trigger InterfaceTable 15-2 T
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Page 701 and 702: Appendix ASignal DescriptionsThis a
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Signal DescriptionsA.8 Miscellaneou
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Appendix BInstruction MnemonicsThis
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Instruction MnemonicsTable B-1 Adva
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Instruction MnemonicsB.2 VFP data-p
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GlossaryThis glossary describes som
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GlossaryApplication Specific Integr
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GlossaryRead ID capabilityThe maxim
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GlossaryByte-invariantIn a byte-inv
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GlossaryCAM includes comparison log
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GlossaryDouble-precision valueConsi
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Glossary• arithmetic operation re
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GlossaryInvalidateJazelle architect
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GlossaryPAPenaltyPower-on resetPref
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GlossarySetSet-associative cacheSee
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GlossaryTrapTrigger instructionAn e
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GlossaryWrite-back (WB)Write buffer
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