Cortex-A8 Technical Reference Manual - ARM Information Center

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3.2.27 c1, Coprocessor Access Control Register System Control Coprocessor The purpose of the Coprocessor Access Control Register is to set access rights for the coprocessors CP0 through CP13. This register has no effect on access to CP14, the debug control coprocessor, or CP15, the system control coprocessor. This register also provides a means for software to determine if any particular coprocessor, CP0-CP13, exists in the system. The Coprocessor Access Control Register is: • a read/write register common to Secure and Nonsecure states • accessible in privileged modes only. Figure 3-22 shows the bit arrangement of the Coprocessor Access Control Register. Reserved Figure 3-22 Coprocessor Access Control Register format Table 3-51 shows how the bit values correspond with the Coprocessor Access Control Register functions. Bits Field Function 31 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 [31:28] - Reserved. UNP, SBZP. cp13 cp12 cp11 cp10 cp9 cp8 cp7 cp6 cp5 cp4 cp3 cp2 cp1 cp0 Table 3-51 Coprocessor Access Control Register bit functions - cp a Defines access permissions for each coprocessor. Access denied is the reset condition and is the behavior for nonexistent coprocessors: b00 = Access denied, reset value. Attempted access generates an Undefined Instruction exception. b01 = Privileged mode access only. b10 = Reserved. b11 = Privileged and User mode access. a. n is the coprocessor number between 0 and 13. Nonsecure Access Control Register bit Access to coprocessors in the Nonsecure state depends on the permissions set in the c1, Nonsecure Access Control Register on page 3-56. Attempts to read or write the Coprocessor Access Control Register access bits depend on the corresponding bit for each coprocessor in c1, Nonsecure Access Control Register on page 3-56. Table 3-52 shows the results of attempted access to coprocessor access bits for each mode. Table 3-52 Results of access to the Coprocessor Access Control Register a Secure privileged Nonsecure privileged Secure User Nonsecure User Read Write Read Write Read Write Read Write 0 Data Data b00 Ignored 1 Data Data Data Data Undefined Undefined a. An entry of Undefined in the table means that the access gives an Undefined Instruction exception when the coprocessor instruction is executed. To access the Coprocessor Access Control Register, read or write CP15 with: MRC p15, 0, , c1, c0, 2 ; Read Coprocessor Access Control Register ARM DDI 0344K Copyright © 2006-2010 ARM Limited. All rights reserved. 3-52 ID060510 Non-Confidential
3.2.28 c1, Secure Configuration Register MCR p15, 0, , c1, c0, 2 ; Write Coprocessor Access Control Register System Control Coprocessor You must execute an Instruction Memory Barrier (IMB) sequence immediately after an update of the Coprocessor Access Control Register, see Memory Barriers in the ARM Architecture Reference Manual. You must not attempt to execute any instructions that are affected by the change of access rights between the IMB sequence and the register update. To determine if any particular coprocessor exists in the system, write the access bits for the coprocessor of interest with a value other than b00. If the coprocessor does not exist in the system the access rights remain set to b00. Note • For the processor, there is a direct relationship between the CPEXIST[13:0] inputs and the Coprocessor Access Control Register bits cp13-cp01. Each CPEXIST input represents the existence of a coprocessor that you use to enable a particular coprocessor. If the appropriate CPEXIST input is set to a: — logical 0, access is denied to that coprocessor or reset state as defined by the register — logical 1, then you can reprogram that coprocessor. • You must enable the Coprocessor Access Control Register before accessing any NEON or VFP system register. • You must set CPEXIST[11:10] to b11 to use the NEON or VFP coprocessor. All other CPEXIST bits must be set to 0. • You must set CPEXIST[11:10] to b00 if you configure the processor without the NEON coprocessor. The purpose of the Secure Configuration Register is to define: • the current state of the processor as Secure or Nonsecure states • in which state the core executes exceptions • the ability to modify the A and I bits in the CPSR in the Nonsecure state. The Secure Configuration Register is: • a read/write register • accessible in secure privileged modes only. Figure 3-23 shows the bit arrangement of the Secure Configuration Register. 31 6 5 4 3 2 1 0 Reserved Figure 3-23 Secure Configuration Register format ARM DDI 0344K Copyright © 2006-2010 ARM Limited. All rights reserved. 3-53 ID060510 Non-Confidential AW FW EA FIQ IRQ NS
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Copyright © 2006-2010 ARM Limited.
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Web Address http://www.arm.com ARM
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Contents 2.14 The program status re
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Contents 16.6 Instruction-specific
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List of Tables Table 3-16 Debug Fea
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List of Tables Table 3-136 Secure o
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List of Tables Table 12-59 Values t
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List of Figures Cortex-A8 Technical
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List of Figures Figure 3-77 BTB arr
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List of Figures Figure 15-16 CTI Ch
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About this manual Product revision
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old Highlights interface elements,
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Feedback Feedback on the product Fe
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1.1 About the processor Introductio
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1.3 Components of the processor L1
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1.3.6 NEON 1.3.7 ETM The NEON unit
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1.5 Debug Introduction The processo
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1.7 Configurable options Table 1-1
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Introduction • The various data a
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1.9.6 r2p0-r2p1 1.9.7 r2p1-r2p2 1.9
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Chapter 2 Programmers Model This ch
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2.2 Thumb-2 instruction set Program
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Bits Field Function Programmers Mod
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2.4 Jazelle Extension 2.4.1 Jazelle
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2.5 Security Extensions architectur
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2.6 Advanced SIMD architecture Prog
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2.8 Processor operating states 2.8.
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2.10 Memory formats 2.10.1 Byte-inv
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2.12 Operating modes Programmers Mo
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System and User r0 r1 r2 r3 r4 r5 r
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2.14 The program status registers 2
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2.14.5 The GE[3:0] bits Programmers
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Mode bits Programmers Model M[4:0]
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2.15 Exceptions 2.15.1 Exception en
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2.15.5 Interrupt request 2.15.6 Abo
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This restores both the PC and the C
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2.15.13 Exception priorities Progra
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2.17 Hardware consideration for Sec
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SECMONOUT[78] instruction caches at
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Page 81 and 82: System Control Coprocessor Register
Page 83 and 84: 3.1.3 MMU control and configuration
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Page 87 and 88: CRn Op1 CRm Op2 Register or operati
Page 97 and 98: 3.2.2 c0, Main ID Register System C
Page 99 and 100: 3.2.4 c0, TCM Type Register 3.2.5 c
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Page 105 and 106: System Control Coprocessor Table 3-
Page 107 and 108: Bits Field Function [11:8] L1 Harva
Page 109 and 110: Bits Field Function [11:8] Harvard
Page 111 and 112: 31 28 27 24 23 20 19 16 15 12 11 8
Page 113 and 114: Table 3-30 shows the results of att
Page 115 and 116: System Control Coprocessor 31 28 27
Page 117 and 118: Table 3-36 shows the results of att
Page 119 and 120: • accessible in privileged modes
Page 121 and 122: CSSR Size 3.2.24 c0, Cache Size Sel
Page 123 and 124: System Control Coprocessor 31 30 29
Page 125 and 126: MCR p15, 0, , c1, c0, 0 ; Write Con
Page 127 and 128: Bits Field [19] Clock stop request
Page 129: Bits Field Security State NS S Tabl
Page 133 and 134: AW EA Function Table 3-55 shows the
Page 137 and 138: 3.2.32 c2, Translation Table Base R
Page 139 and 140: System Control Coprocessor Figure 3
Page 141 and 142: Bits Field Function 3.2.35 c5, Data
Page 143 and 144: 3.2.36 c5, Instruction Fault Status
Page 145 and 146: 3.2.38 c6, Data Fault Address Regis
Page 147 and 148: System Control Coprocessor Note •
Page 149 and 150: System Control Coprocessor Figure 3
Page 153 and 154: 3.2.41 c8, TLB operations The data
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Page 157 and 158: EN b 3.2.44 c9, Count Enable Clear
Page 159 and 160: EN b 3.2.46 c9, Software Increment
Page 161 and 162: EN b 3.2.48 c9, Cycle Count Registe
Page 163 and 164: EN b Table 3-96 shows the results o
Page 165 and 166: Value Description 0x44 Any cacheabl
Page 167 and 168: DBGEN || NIDEN 3.2.51 c9, User Enab
Page 169 and 170: EN 3.2.53 c9, Interrupt Enable Clea
Page 171 and 172: Figure 3-48 shows the bit arrangeme
Page 173 and 174: 3.2.55 c9, L2 Cache Auxiliary Contr
Page 175 and 176: Bits Field Function [8:6] Tag RAM l
Page 177 and 178: TL bit value 3.2.57 c10, TLB preloa
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System Control Coprocessor Table 3-
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The PLE Identification and Status R
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3.2.62 c11, PLE enable commands U b
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Bits Field Function System Control
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U bit PLE bit Table 3-129 shows the
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U bit PLE bit System Control Coproc
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3.2.68 c12, Secure or Nonsecure Vec
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3.2.70 c12, Interrupt Status Regist
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The FCSE PID Register is: • a rea
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TLB CAM read/write TLB ATTR read/wr
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MCR p15 0, , c15, c3, 4 ; I-L1 TLB
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31 27 26 22 21 0 Reserved L1 Data 0
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System Control Coprocessor The L1 H
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3.2.78 c15, L1 data array operation
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Instruction L1 Data 0 register Inst
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Parity/ECC RAM read/write Data RAM
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3.2.82 c15, L2 parity/ECC array ope
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3.2.84 c15, L2 data array operation
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4.1 About unaligned and mixed-endia
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Unaligned Data and Mixed-endian Dat
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Chapter 5 Program Flow Prediction T
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5.2 Predicted instructions Program
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Program Flow Prediction Because ret
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5.4 Guidelines for optimal performa
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5.6 Operating system and predictor
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6.1 About the MMU Memory Management
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6.3 16MB supersection support Memor
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6.5 External aborts 6.5.1 External
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6.7 MMU software-accessible registe
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7.1 About the L1 memory system Leve
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7.2.6 Instruction cache maintenance
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L1 inner policy a L2 outer policy N
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7.5 Data cache features 7.5.1 Data
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7.7 Hardware support for virtual al
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Chapter 8 Level 2 Memory System Thi
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8.2 Cache organization 8.2.1 L2 cac
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8.3 Enabling and disabling the L2 c
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Level 2 Memory System Note It is en
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Level 2 Memory System Note You must
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Lock address : LockAddr Lock free :
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8.7 Parity and error correction cod
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9.1 About the external memory inter
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Integer data and CP14 writes Noncac
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9.4 AXI data read/write transaction
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Noncacheable, or strongly ordered,
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Noncacheable store word Noncacheabl
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LA Last Access External Memory Inte
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10.1 Clock domains 10.1.1 AXI clock
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10.2 Reset domains 10.2.1 Power-on
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REFCLK (PLL input) nPORESET ARESETn
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10.3 Power control 10.3.1 Dynamic p
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Clock, Reset, and Power Control the
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ATB APB I/O clamp I/O clamp L/S = L
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ATB APB I/O clamp I/O clamp LS = Le
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Clock, Reset, and Power Control 3.
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Powering up the debug and ETM domai
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7. Perform a normal software reset
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Clock, Reset, and Power Control 5.
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Chapter 11 Design for Test This cha
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In L1 MBIST Instruction Register Fi
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Note Do not test the CAMBIST arrays
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• number of rows of the L2 data,
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Design for Test Not all row setting
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In Design for Test Figure 11-4 show
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Design for Test When testing the ta
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CLK ARESETn MBISTMODE MBISTSHIFT MB
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End-of-test datalog retrieval Desig
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Pattern N RWRXMARCH 8N Row-fast Sta
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4. rscan array, data_seed = invert.
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3. R_, W, R, decr. 4. rscan data fr
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• the data after pass 1 of XADDRB
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(1 + (2 17)) 2 17 = 4,587,520 cycle
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processor input ports WEXTEST WINTE
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Design for Test toggling during shi
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12.1 Debug systems 12.1.1 Debug hos
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12.2.3 Security extensions and debu
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Instruction Mnemonic Description 12
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12.3.6 Power domains and debug 12.3
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Table 12-5 shows the APB interface
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12.4 Debug register descriptions Te
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MRC p14, 0, , c0, c0, 0 ; Read Debu
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31 30 29 28 27 26 25 24 23 22 21 20
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Bits Field Function [21:20] DTR acc
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Bits Field Function To access the D
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12.4.7 Watchpoint Fault Address Reg
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Bits Access Normal address [2] RW V
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12.4.12 Debug Run Control Register
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Table 12-23 shows how the bit value
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BVR[22:20] Meaning b011 The corresp
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Bits Field Function [15:14] Secure
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12.4.18 Operating System Lock Statu
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Debug • The sequence can be aband
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12.5 Management registers Offset Th
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Offset Register number Mnemonic Fun
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Bits Field Function [5] nDMAIRQ nDM
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12.5.7 Claim Tag Clear Register 12.
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12.5.10 Authentication Status Regis
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Table 12-45 shows fields that are i
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12.6 Debug events 12.6.1 Software d
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12.6.5 Watchpoint debug events If a
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Table 12-53 shows the values in the
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12.8 Debug state 12.8.1 Entering de
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12.8.4 Writing to the CPSR in debug
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Mode SCR[0] For CP15 instructions,
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12.8.9 Leaving debug state Imprecis
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12.9.3 Cache usage profiling Debug
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Note DBGPWRDWNREQ must be tied LOW
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If software running on the processo
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Rules for accessing the DCC At the
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} While the processor is running, i
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Debug Table 12-59 Values to write t
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12.11.4 Debug state entry Example 1
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} // Step 1. Update the CPSR value
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Writing the CPSR in debug state Exa
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Debug Example 12-21 Reading a word
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} // Step 9. Check for aborts. abor
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12.12 Debugging systems with energy
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MOV r0, r4 POP {r4, pc} Example 12-
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Chapter 13 NEON and VFP Programmers
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13.2 General-purpose registers 13.2
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13.3 Short vectors 13.3.1 About reg
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13.3.2 Operations using register ba
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NEON and VFP Programmers Model The
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Note All hardware ID information is
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Bits Field Function [12:8] - Reserv
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NEON and VFP Programmers Model Tabl
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13.6 Compliance with the IEEE 754 s
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Underflow NEON and VFP Programmers
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14.1 About the ETM 14.1.1 ETM featu
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14.1.3 NEON Bridge and bus matrix A
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14.3 ETM register summary The ETM r
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Bits Field Function [11:8] Major ET
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14.4.4 Peripheral Identification Re
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See the ETM Architecture Specificat
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Embedded Trace Macrocell Table 14-1
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14.5.3 Enabling events 14.5.4 Addre
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14.7 Context ID tracing Embedded Tr
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14.9 Idle state control Embedded Tr
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Chapter 15 Cross Trigger Interface
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CTICHIN[0] CTICHIN[1] CTICHIN[2] CT
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15.2 Trigger inputs and outputs Tri
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15.3 Connecting asynchronous channe
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15.5 CTI register summary Address o
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15.6 CTI register descriptions This
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15.6.4 CTI Application Trigger Clea
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Table 15-10 shows how the bit value
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15.6.12 ASIC Control Register, ASIC
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15.7 CTI Integration Test Registers
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15.7.4 ITTRIGOUTACK, 0xEF0 15.7.5 I
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Cross Trigger Interface Table 15-26
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15.8.3 Device Type Identifier, 0xFC
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Cross Trigger Interface Table 15-31
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16.1 About instruction cycle timing
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Instruction Cycle Timing Example 16
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Table 16-4 shows the operation of m
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Table 16-9 shows the operation of l
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d. See Load/store instructions on p
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Instruction Cycle Timing Table 16-1
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16.4 Other pipeline-dependent laten
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16.4.5 Conditional instructions Ins
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16.6 Instruction-specific schedulin
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Instruction Cycle Timing VNEG Dd,Dm
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VMLA a VMLS a VMLAa VMLSa VQDMLAa V
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VSLI VSRI 16.6.5 Advanced SIMD floa
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16.6.6 Advanced SIMD byte permute i
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Instruction Table 16-23 shows the o
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Instruction VST3 3-reg (unaligned)
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Instruction VLD3 3-reg (unaligned)
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Instruction Single precision cycles
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• FMACS, FNMACS • FMSCS, FNMSCS
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is dual issued with previous instru
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17.1 About setup and hold times AC
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17.2 AXI interface Table 17-2 shows
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17.3 ATB and CTI interfaces Table 1
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AC Characteristics Table 17-4 Timin
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17.6 L2 preload interface AC Charac
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17.8 Miscellaneous signals AC Chara
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A.1 AXI interface Signal Descriptio
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A.3 MBIST and DFT interface A.3.1 M
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A.4 Preload engine interface Table
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A.6 Miscellaneous signals Table A-7
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Signal I/O Reset Description CFGNMF
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Signal I/O Reset Description DBGNOP
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Appendix B Instruction Mnemonics Th
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Instruction Mnemonics Table B-1 Adv
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Appendix C Revisions This appendix
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Revisions Added text to clarify des
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Glossary This glossary describes so
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Glossary Automatic Test Pattern Gen
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Big-endian memory Memory in which:
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Conditional execution Glossary incl
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Glossary Embedded Trace Macrocell (
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Illegal instruction An instruction
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Glossary NaN Not a number. A symbol
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Glossary Significand The component
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Glossary Watchpoint A watchpoint is
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