Cortex-A8 R2P2.pdf - ARM Information Center

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Introduction1.4 External interfaces of the processorThe processor has the following external interfaces:• AMBA AXI interface• AMBA APB interface• AMBA ATB interface• DFT interface.1.4.1 AMBA AXI interfaceThe AXI bus interface is the main interface to the system bus. It performs L2 cache fillsand noncacheable accesses for both instructions and data. The AXI interface supports64-bit or 128-bit wide input and output data buses. It also supports multiple outstandingrequests on the AXI bus. The AXI signals are synchronous to the CLK input. A widerange of bus clock to core clock ratios is possible through the use of the AXI clockenable signal ACLKEN. See the AMBA AXI Protocol Specification for moreinformation.1.4.2 AMBA APB interfaceThe Cortex-A8 processor implements an APB slave interface that enables access to theETM, CTI, and the debug registers. The APB interface is compatible with the CoreSightarchitecture which is the ARM architecture for multi-processor trace and debug. See theCoreSight Architecture Specification for more information.1.4.3 AMBA ATB interfaceThe Cortex-A8 processor implements an ATB interface that outputs trace informationused for debugging. The ATB interface is compatible with the CoreSight architecture.See the CoreSight Architecture Specification for more information.1.4.4 DFT interfaceThe Design For Test (DFT) interface provides support for manufacturing testing of thecore using Memory Built-In Self Test (MBIST) and Automatic Test Pattern Generation(ATPG). See Chapter 11 Design for Test for more information.1-8 Copyright © 2006-2008 ARM Limited. All rights reserved. ARM DDI 0344E
Introduction1.5 DebugThe processor implements the ARMv7 Debug architecture that includes support forSecurity Extensions and CoreSight. To get full access to the processor debug capability,you can access the debug register map through the Advanced Peripheral Bus (APB)slave interface. See Chapter 12 Debug for more information on the Cortex-A8implementation of debug. See the ARM Architecture Reference Manual for moreinformation on the ARMv7 Debug architecture.ARM DDI 0344E Copyright © 2006-2008 ARM Limited. All rights reserved. 1-9
Page 1 and 2: Cortex -A8Revision: r2p2Technical R
Page 3 and 4: Product StatusThe information in th
Page 5 and 6: ContentsCortex-A8 Technical Referen
Page 7 and 8: Contents7.8 Parity detection ......
Page 9 and 10: ContentsA.2 ATB interface .........
Page 11 and 12: List of TablesCortex-A8 Technical R
Page 14 and 15: List of TablesTable 3-103 Results o
Page 16 and 17: List of TablesTable 12-1 Access to
Page 18 and 19: List of TablesTable 15-3 CTI regist
Page 20 and 21: List of Tablesxx Copyright © 2006-
Page 22 and 23: List of FiguresFigure 3-10 Memory M
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Page 26 and 27: List of FiguresFigure 15-16 CTI Cha
Page 28 and 29: PrefaceAbout this manualThis is the
Page 30 and 31: PrefaceChapter 16 Instruction Cycle
Page 32 and 33: PrefacePrefix CPrefix HPrefix nPref
Page 34 and 35: PrefaceFeedbackARM welcomes feedbac
Page 36 and 37: Introduction1.1 About the processor
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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 CoprocessorThe Auxil
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System Control Coprocessorb. The EN
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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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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 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 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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Debug12.4.16 Watchpoint Control Reg
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DebugNoteOn system reset, PRSR[1] r
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DebugTable 12-32 Management registe
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Debug12.5.5 Integration Mode Contro
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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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Debug12.9 Cache debugThere are seve
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DebugDBGROMADDRThe DBGROMADDR signa
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Debug12.11.1 Debug communications c
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Debug}when 1:byte_address_select :=
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Debug12.11.5 Debug state exitWhen e
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Chapter 13NEON and VFP Programmer
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NEON and VFP Programmer’s Modelre
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Chapter 14Embedded Trace MacrocellT
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Embedded Trace MacrocellThe followi
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Embedded Trace Macrocell14.8 Instru
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Embedded Trace MacrocellWhen a WFI
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Chapter 15Cross Trigger InterfaceTh
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Cross Trigger Interface15.4 About t
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Chapter 16Instruction Cycle TimingT
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Instruction Cycle Timing16.2 Instru
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Instruction Cycle TimingTable 16-4
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Instruction Cycle Timing16.2.7 Stat
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Instruction Cycle TimingThe number
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Instruction Cycle Timing16.7 VFP in
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AC Characteristics17.5 L1 and L2 MB
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AC Characteristicsb. Figure 10-6 on
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Appendix ASignal DescriptionsThis a
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Signal DescriptionsA.2 ATB interfac
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Signal DescriptionsTable A-3 MBIST
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Signal DescriptionsA.4 Preload engi
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Signal DescriptionsTable A-7 Miscel
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Signal DescriptionsA.8 Miscellaneou
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Instruction MnemonicsB.2 VFP data-p
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GlossaryThis glossary describes som
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GlossaryRead ID capabilityThe maxim
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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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