Cortex-A8 Technical Reference Manual - ARM Information Center

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VSUM VFMX VPMN VMUL Dd,Dn,Dm[x] VMLAa VMLSa VRECPSa VRSQRTSa Instruction Cycle Timing Dd,Dn,Dm 1 Dn:N1 Dm:N1 - - Dd:N5 - (scalar) Qd,Qn,Dm[x] (scalar) 1 Dn:N2 Dm:N1 - - Dd:N5 - 1 2 QnLo:N2 QnHi:N2 Note The VMLA.F and VMLS.F type instructions have additional restrictions that determine when they can be issued: • If a VMLA.F is followed by a VMLA.F with no RAW hazard, the second VFMLA.F issues with no stalls. • If a VMLA.F is followed by an VADD.F or VMUL.F with no RAW hazard, the VADD.F or VMUL.F stalls 4 cycles before issue. The 4 cycle stall preserves the in-order retirement of the instructions. • A VMLA.F followed by any NEON floating-point instruction with RAW hazard stalls for 8 cycles. ARM DDI 0344K Copyright © 2006-2010 ARM Limited. All rights reserved. 16-25 ID060510 Non-Confidential Dm:N1 - - - - - QdLo:N5 QdHi:N5 Dd,Dn,Dm 1 Dn:N2 Dm:N2 Dd:N3 - Dd:N9 - Qd,Qn,Qm 1 2 Dd,Dn,Dm[x] (scalar) Qd,Qn,Dm[x] (scalar) QnLo:N2 QnHi:N2 QmLo:N2 QmHi:N2 QdLo:N3 QdHi:N3 - - QdLo:N9 QdHi:N9 1 Dn:N2 Dm:N1 Dd:N3 - Dd:N9 - 1 2 QnLo:N2 QnHi:N2 Dm:N1 - QdLo:N3 QdHi:N3 - - QdLo:N9 QdHi:N9 Dd,Dn,Dm 1 Dn:N2 Dm:N2 - - Dd:N9 - Qd,Qn,Qm 1 2 Table 16-21 Advanced SIMD floating-point instructions (continued) Instruction Register format Cycles Source1 Source2 Source3 Source4 Result1 Result2 QnLo:N2 QnHi:N2 QmLo:N2 QmHi:N2 - - - - QdLo:N9 QdHi:N9 a. The VMLA.F, VMLS.F, VRECPS.F, VRSQRTS.F instructions begin execution on the floating-point multiply pipeline. The floating-point multiply result is then forwarded to the floating-point add pipeline to complete the accumulate portion of the instructions. Therefore, these instructions are pipelined across ten stages, N1 through N10, where N10 is the writeback stage. - - - - - - - -
16.6.6 Advanced SIMD byte permute instructions Table 16-22 shows the operation of the Advanced SIMD byte permute instructions. Instruction Cycle Timing Table 16-22 Advanced SIMD byte permute instructions Instruction Register format Cycles Source 1 Source 2 Source 3 Source 4 Result 1 Result 2 VMOV Dd,Qm (narrow) VMOV Dd,Dm[x] VTRN VSWP (scalar) Qd,Dm[x] (scalar) 1 QmLo:N1 QmHi:N1 - - Dd:N2 - 1 Dm:N1 - - - Dd:N2 - 1 Dm:N1 - - - QdLo:N2 QdHi:N2 Dd,Dm 1 Dd:N1 Dm:N1 - - Dd:N2 Dm:N2 Qd,Qm 1 2 QdLo:N1 QdHi:N1 QmLo:N1 QmHi:N1 ARM DDI 0344K Copyright © 2006-2010 ARM Limited. All rights reserved. 16-26 ID060510 Non-Confidential - - - - QdLo:N2 QdHi:N2 VZIP Dd,Dm 1 Dd:N1 Dm:N1 - - Dd:N2 Dm:N2 Qd,Qm 1 2 3 QdLo:N1 QdHi:N1 - QmLo:N1 QmHi:N1 - - - - - - - - QdLo:N2 QmLo:N2 VUZP Dd,Dm 1 Dd:N1 Dm:N1 - - Dd:N2 Dm:N2 Qd,Qm 1 2 3 QdLo:N1 QmLo:N1 - QdHi:N1 QmHi:N1 - - - - - - - QdLo:N2 QdHi:N2 VREV Dd,Dm 1 Dm:N1 - - - Dd:N2 - QmLo:N2 QmHi:N2 - QdHi:N2 QmHi:N2 - QmLo:N2 QmHi:N2 Qd,Qm 1 QmLo:N1 QmHi:N1 - - QdLo:N2 QdHi:N2 VEXT Dd,Dn,Dm,#IMM 1 Dn:N1 Dm:N1 - - Dd:N2 - Qd,Qn,Qm,#IMM 1 2 VTBL Dd,{Dn},Dm 1 2 Dd,{Dn,Dn1},Dm 1 2 Dd,{Dn,Dn1,Dn2},Dm 1 2 3 Dd,{Dn,Dn1,Dn2,Dn3},Dm 1 2 3 QnLo:N1 QmLo:N1 - Dn:N1 - Dn:N1 - Dn:N1 Dn2:N1 - Dn:N1 Dn2:N1 QnHi:N1 QmHi:N1 Dm:N1 - Dm:N1 Dn1:N1 Dm:N1 Dn1:N1 - Dm:N1 Dn1:N1 Dn3:N1 - - - - - - - - - - - - - - - - - - - - - - - - - QdLo:N2 - Dd:N2 - Dd:N2 - - Dd:N2 - - Dd:N2 - QdHi:N2 - - - - - - - - - -
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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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Chapter 3 System Control Coprocesso
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System Control Coprocessor Register
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3.1.3 MMU control and configuration
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3.2 System control coprocessor regi
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CRn Op1 CRm Op2 Register or operati
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3.2.2 c0, Main ID Register System C
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3.2.4 c0, TCM Type Register 3.2.5 c
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3.2.7 c0, Processor Feature Registe
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• accessible in privileged modes
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System Control Coprocessor Table 3-
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Bits Field Function [11:8] L1 Harva
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Bits Field Function [11:8] Harvard
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31 28 27 24 23 20 19 16 15 12 11 8
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Table 3-30 shows the results of att
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System Control Coprocessor 31 28 27
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Table 3-36 shows the results of att
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• accessible in privileged modes
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CSSR Size 3.2.24 c0, Cache Size Sel
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System Control Coprocessor 31 30 29
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MCR p15, 0, , c1, c0, 0 ; Write Con
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Bits Field [19] Clock stop request
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Bits Field Security State NS S Tabl
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3.2.28 c1, Secure Configuration Reg
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AW EA Function Table 3-55 shows the
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3.2.32 c2, Translation Table Base R
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System Control Coprocessor Figure 3
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Bits Field Function 3.2.35 c5, Data
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3.2.36 c5, Instruction Fault Status
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3.2.38 c6, Data Fault Address Regis
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System Control Coprocessor Note •
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System Control Coprocessor Figure 3
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3.2.41 c8, TLB operations The data
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Figure 3-38 shows the bit arrangeme
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EN b 3.2.44 c9, Count Enable Clear
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EN b 3.2.46 c9, Software Increment
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EN b 3.2.48 c9, Cycle Count Registe
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EN b Table 3-96 shows the results o
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Value Description 0x44 Any cacheabl
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DBGEN || NIDEN 3.2.51 c9, User Enab
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EN 3.2.53 c9, Interrupt Enable Clea
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Figure 3-48 shows the bit arrangeme
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3.2.55 c9, L2 Cache Auxiliary Contr
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Bits Field Function [8:6] Tag RAM l
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TL bit value 3.2.57 c10, TLB preloa
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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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Page 465 and 466: Chapter 15 Cross Trigger Interface
Page 467 and 468: CTICHIN[0] CTICHIN[1] CTICHIN[2] CT
Page 469 and 470: 15.2 Trigger inputs and outputs Tri
Page 471 and 472: 15.3 Connecting asynchronous channe
Page 473 and 474: 15.5 CTI register summary Address o
Page 475 and 476: 15.6 CTI register descriptions This
Page 477 and 478: 15.6.4 CTI Application Trigger Clea
Page 479 and 480: Table 15-10 shows how the bit value
Page 481 and 482: 15.6.12 ASIC Control Register, ASIC
Page 483 and 484: 15.7 CTI Integration Test Registers
Page 485 and 486: 15.7.4 ITTRIGOUTACK, 0xEF0 15.7.5 I
Page 487 and 488: Cross Trigger Interface Table 15-26
Page 489 and 490: 15.8.3 Device Type Identifier, 0xFC
Page 491 and 492: Cross Trigger Interface Table 15-31
Page 493 and 494: 16.1 About instruction cycle timing
Page 495 and 496: Instruction Cycle Timing Example 16
Page 497 and 498: Table 16-4 shows the operation of m
Page 499 and 500: Table 16-9 shows the operation of l
Page 501 and 502: d. See Load/store instructions on p
Page 503 and 504: Instruction Cycle Timing Table 16-1
Page 505 and 506: 16.4 Other pipeline-dependent laten
Page 507 and 508: 16.4.5 Conditional instructions Ins
Page 509 and 510: 16.6 Instruction-specific schedulin
Page 511 and 512: Instruction Cycle Timing VNEG Dd,Dm
Page 513 and 514: VMLA a VMLS a VMLAa VMLSa VQDMLAa V
Page 515: VSLI VSRI 16.6.5 Advanced SIMD floa
Page 519 and 520: Instruction Table 16-23 shows the o
Page 521 and 522: Instruction VST3 3-reg (unaligned)
Page 523 and 524: Instruction VLD3 3-reg (unaligned)
Page 525 and 526: Instruction Single precision cycles
Page 527 and 528: • FMACS, FNMACS • FMSCS, FNMSCS
Page 529 and 530: is dual issued with previous instru
Page 531 and 532: 17.1 About setup and hold times AC
Page 533 and 534: 17.2 AXI interface Table 17-2 shows
Page 535 and 536: 17.3 ATB and CTI interfaces Table 1
Page 537 and 538: AC Characteristics Table 17-4 Timin
Page 539 and 540: 17.6 L2 preload interface AC Charac
Page 541 and 542: 17.8 Miscellaneous signals AC Chara
Page 543 and 544: A.1 AXI interface Signal Descriptio
Page 545 and 546: A.3 MBIST and DFT interface A.3.1 M
Page 547 and 548: A.4 Preload engine interface Table
Page 549 and 550: A.6 Miscellaneous signals Table A-7
Page 551 and 552: Signal I/O Reset Description CFGNMF
Page 553 and 554: Signal I/O Reset Description DBGNOP
Page 555 and 556: Appendix B Instruction Mnemonics Th
Page 557 and 558: Instruction Mnemonics Table B-1 Adv
Page 559 and 560: Appendix C Revisions This appendix
Page 561 and 562: Revisions Added text to clarify des
Page 563 and 564: Glossary This glossary describes so
Page 565 and 566: 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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