ARM Cortex-A15 MPCore Processor Technical Reference Manual

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Chapter 14NEON and VFP UnitThis chapter describes the Cortex-A15 NEON and VFP unit, their features, and the registers thatthey use. This chapter contains the following sections:• About NEON and VFP unit on page 14-2.• Programmers model for NEON and VFP unit on page 14-4.ARM DDI 0438I Copyright © 2011-2013 ARM. All rights reserved. 14-1ID062913Non-Confidential
NEON and VFP Unit14.1 About NEON and VFP unitNEON technology is the implementation of the Advanced Single Instruction Multiple Data(SIMD) extension to the ARMv7-A architecture. It provides support for integer andfloating-point vector operations. This technology extends the processor functionality to providesupport for the ARMv7 Advanced SIMDv2 instruction set.VFP is the vector floating-point coprocessor extension to the ARMv7-A architecture. Itprovides low-cost high performance floating-point computation. VFP extends the processorfunctionality to provide support for the ARMv7 VFPv4 instruction set.You can configure the Cortex-A15 MPCore processor to include different combinations ofsupport for Advanced SIMD and VFP extensions. Table 14-1 shows the possible combinations.Table 14-1 Combinations of Advanced SIMD and VFP extensionsAdvanced SIMDv2SupportedNot supportedNot supportedVFPv4SupportedSupportedNot supportedThis section describes the following:• Advanced SIMDv2 support.• VFPv4 support.14.1.1 Advanced SIMDv2 supportThe processor supports all addressing modes, data types, and operations in the AdvancedSIMDv2 extension. See the ARM ® Architecture Reference Manual ARMv7-A and ARMv7-Redition for information on the Advanced SIMDv2 instruction set.14.1.2 VFPv4 supportThe processor supports all addressing modes, data types, and operations in the VFPv4 extensionwith version 3 of the Common VFP subarchitecture. The processor implements VFPv4-D32.See the ARM ® Architecture Reference Manual ARMv7-A and ARMv7-R edition for informationon the VFPv4 instruction set.In the Cortex-A15 VFP implementation:• All scalar operations are implemented entirely in hardware, with support for allcombinations of rounding modes, flush-to-zero, and default NaN modes.• Vector operations are not supported. Any attempt to execute a vector operation results inan Undefined Instruction exception. If an application requires VFP vector operation, thenit must use VFP support code. See the ARM ® Architecture Reference Manual ARMv7-Aand ARMv7-R edition for information on VFP vector operation support.• The Cortex-A15 VFP implementation does not generate asynchronous VFP exceptions.NoteAn attempt to execute a vector operation that results in an Undefined Instruction exception doesnot set the FPEXC.DEX bit.ARM DDI 0438I Copyright © 2011-2013 ARM. All rights reserved. 14-2ID062913Non-Confidential
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®ARM®Cortex -A15 MPCoreProcessorR
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ContentsARM Cortex-A15 MPCore Proce
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Contents11.4 PMU register descripti
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PrefaceAbout this bookThis book is
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Preface(continued)Stylemonospace bo
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PrefaceFeedbackARM welcomes feedbac
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Introduction1.1 About the Cortex-A1
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Introduction1.2.3 Debug architectur
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Introduction1.4 InterfacesThe proce
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Introduction• The L2 tag RAM regi
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IntroductionThe ARM product deliver
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Introduction1.7.5 r1p0 - r2p0The fo
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Introduction• Added L1 data TLB s
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Functional Description2.1 About the
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Functional DescriptionLoad/Store un
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Functional Description2.2 Interface
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Functional Description2.3 Clocking
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Functional DescriptionFigure 2-5 sh
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Functional DescriptionAll resets ar
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Functional DescriptionPowerup reset
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Functional Description• nPRESETDB
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Functional Description• L2 unifie
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Functional DescriptionOn entry into
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Functional DescriptionWhen the proc
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Functional DescriptionNoteFigure 2-
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Functional DescriptionRegional cloc
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Functional DescriptionTable 2-3 Val
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Functional Description4. Release th
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Functional DescriptionDebug power d
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Functional DescriptionNoteAfter a p
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Functional DescriptionThe external
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Programmers Model3.1 About the prog
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Programmers Model3.3 Advanced SIMD
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Programmers ModelYou can use the CP
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Programmers Model3.6 Large Physical
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Programmers Model3.8 Modes of opera
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Chapter 4System ControlThis chapter
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System Control4.2 Register summaryT
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System ControlOp1 CRm Op2 Name Rese
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System ControlTable 4-6 c5 register
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System ControlTable 4-8 c7 register
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System ControlTable 4-10 c9 registe
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System Control4.2.14 c15 registersT
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System ControlName CRn Op1 CRm Op2
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System Control4.2.19 Other system c
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System Control4.2.24 Performance mo
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System Control4.2.26 Virtualization
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System Control4.3 Register descript
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System ControlTo access the CTR, re
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System ControlTable 4-34 shows the
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System Control4.3.12 Memory Model F
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System ControlTable 4-40 ID_MMFR3 b
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System Control31 28 27 24 23 20 19
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System ControlTable 4-43 ID_ISAR2 b
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System ControlConfigurationsAvailab
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System ControlMCR p15, 4, , c0, c0,
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System ControlTable 4-52 SCTLR bit
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System Control31 30 29 28 27 26 25
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System ControlTable 4-53 ACTLR bit
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System ControlTable 4-53 ACTLR bit
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System ControlUsage constraints The
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System Control• The L2 internal a
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System Control31 30 29 28 27 26 25
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System ControlUsage constraints The
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System ControlTable 4-59 HCPTR bit
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System ControlTable 4-61 DFSR bit a
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System ControlTable 4-63 IFSR bit a
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System ControlConfigurationsAvailab
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System Control• UNKNOWN when exec
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System Control31 30 26 25 24 23 22
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System Control• Only accessible f
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System Control31 0DataFigure 4-40 I
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System ControlThe data returned fro
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System ControlThe data returned fro
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System Control31 24 23 21 20 19 18
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System Control4.3.60 L2 Auxiliary C
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System ControlTable 4-74 L2ACTLR bi
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System Control• Is only accessibl
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System ControlTable 4-79 L2MERRSR b
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Memory Management Unit5.1 About the
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Memory Management Unit5.3 TLB match
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Memory Management Unit• The TLB t
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Memory Management Unit5.6 Intermedi
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Memory Management Unit5.7 External
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Level 1 Memory System6.1 About the
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Level 1 Memory System6.3 L1 instruc
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Level 1 Memory System6.4 L1 data me
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Level 1 Memory SystemL1 or L2 cache
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Level 1 Memory SystemExternal globa
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Level 1 Memory System6.5 Program fl
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Level 1 Memory SystemReset:• Disa
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Chapter 7Level 2 Memory SystemThis
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Level 2 Memory System7.2 Cache orga
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Level 2 Memory System7.2.5 Register
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Level 2 Memory SystemNote• The L2
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Level 2 Memory System7.4 L2 cache p
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Level 2 Memory System7.6 Asynchrono
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Level 2 Memory SystemFor certain tr
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Level 2 Memory System7.7.6 Snoop fi
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Level 2 Memory SystemTable 7-6 show
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Chapter 8Generic Interrupt Controll
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Generic Interrupt Controller8.2 GIC
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Generic Interrupt Controller8.2.4 I
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Generic Interrupt Controller8.3 GIC
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Generic Interrupt ControllerOffset
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Generic Interrupt ControllerTable 8
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Generic Interrupt ControllerPrivate
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Generic Interrupt Controller0x1D043
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Generic Interrupt ControllerThe Cor
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Generic Interrupt ControllerTable 8
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Generic Interrupt Controller8.3.8 V
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Generic Timer9.1 About the Generic
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Generic Timer9.3 Generic Timer prog
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Chapter 10DebugThis chapter describ
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Debug• Operating systems.• Hard
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DebugnPRESETDBGThis signal initiali
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DebugTable 10-1 CP14 debug register
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DebugTable 10-1 CP14 debug register
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DebugTable 10-2 DBGDIDR bit assignm
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DebugTable 10-4 shows the DBGDRCR b
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DebugConfigurationsAttributesThe pr
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DebugTable 10-8 DBGBCR bit assignme
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DebugTable 10-10 shows the DBGWCR b
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Debug31 12 11 2 1 0ROMADDR[31:12]Re
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Debug10.4.12 OS Lock Status Registe
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DebugTable 10-15 shows the DBGPRCR
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DebugTable 10-16 DBGDSAR bit assign
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Debug31 1 0ReservedIntegration mode
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DebugTable 10-22 shows the DBGDEVID
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Debug10.4.23 Component Identificati
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Debug10.6 External debug interfaceT
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DebugIf software running on the pro
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Performance Monitor Unit11.1 About
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Performance Monitor Unit11.3 PMU re
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Page 304 and 305: Performance Monitor Unit11.5 Effect
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Page 310 and 311: Chapter 12Program Trace MacrocellTh
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Page 318 and 319: Program Trace Macrocellarchitecture
Page 320 and 321: Program Trace Macrocell12.6 Registe
Page 322 and 323: Program Trace MacrocellTable 12-4 P
Page 324 and 325: Program Trace MacrocellTable 12-5 E
Page 326 and 327: Program Trace MacrocellTable 12-6 E
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Page 330 and 331: Program Trace Macrocell12.7.8 Confi
Page 332 and 333: Program Trace Macrocell12.7.10 Auxi
Page 334 and 335: Program Trace Macrocell31 4 3 2 0Re
Page 336 and 337: Program Trace MacrocellTable 12-17
Page 338 and 339: Program Trace Macrocell31 7 60Reser
Page 340 and 341: Program Trace MacrocellThe Componen
Page 342 and 343: Cross Trigger13.1 About the cross t
Page 344 and 345: Cross Trigger13.3 Cortex-A15 CTIIn
Page 348 and 349: NEON and VFP UnitARM DDI 0438I Copy
Page 350 and 351: NEON and VFP UnitSee the ARM ® Arc
Page 352 and 353: NEON and VFP UnitConfigurationsAvai
Page 354 and 355: NEON and VFP UnitTable 14-5 FPSCR b
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Page 358 and 359: NEON and VFP Unit31 30 29 0Reserved
Page 360 and 361: Signal DescriptionsA.1 About the si
Page 362 and 363: Signal DescriptionsA.3 Reset signal
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Page 366 and 367: Signal DescriptionsA.6 Generic Time
Page 368 and 369: Signal DescriptionsA.8 Power manage
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Page 372 and 373: Signal DescriptionsWrite address ch
Page 374 and 375: Signal DescriptionsTable A-14 Read
Page 376 and 377: Signal DescriptionsTable A-20 Write
Page 378 and 379: Signal DescriptionsA.10 External de
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Page 382 and 383: Signal DescriptionsA.12 Cross trigg
Page 384 and 385: Signal DescriptionsA.14 DFT and MBI
Page 386 and 387: Appendix BRevisionsThis appendix de
Page 388 and 389: RevisionsTable B-3 Differences betw
Page 390 and 391: RevisionsTable B-7 Differences betw
Page 392: RevisionsTable B-8 Differences betw
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ARM Cortex-A15 MPCore Processor Technical Reference Manual

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