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7: Memory Management Unit
7-10 EPSON ARM720T CORE CPU MANUAL
7.3.7 Translating section references
Figure 7-8 shows the complete section translation sequence.
Figure 7-8 Section translation
Note: You must check access permissions contained in the level one descriptor before
generating the physical address.
7.3.8 Level two descriptor
If the level one fetch returns either a coarse page table descriptor or a fine page table
descriptor, this provides the base address of the page table to be used. The page table is then
accessed and a level two descriptor is returned. Figure 7-9 shows the format of level two
descriptors.
Figure 7-9 Level two descriptor
31 14 13 0
Translation base
31 14 13 2 1 0
00
Table indexTranslation base
Modified virtual address
Translation table base
31 20 19 0
Table index Section index
31 20 19 0
Section indexSection base address
Section level one descriptor
Physical address
31 20 19 0
Section base address AP
Domain
1CB10
2134589101112
31 12111098 543210
00
Large page base address 0 1
Small page base address C B 1 0
Tiny page base address 1 1
Fault
Large page
Small page
Tiny page
7616 15
BC
CB
ap0
ap0
ap
ap1ap2ap3
ap1ap2ap3
- ARM720T Revision 4 1
- Contents 5
- 7 Memory Management Unit 6
- List of Figures 8
- List of Tables 10
- CONTENTS 11
- About this document 15
- Typographical conventions 16
- Product revision status 16
- AMBA Specification (Rev 2.0) 17
- Introduction 19
- 1 Introduction 21
- 1: Introduction 22
- 1.1.1 EmbeddedICE-RT logic 23
- 1.2 Coprocessors 25
- 1.3 About the instruction set 25
- 1.3.1 Format summary 26
- 1.3.2 ARM instruction set 27
- Table 1-3 Addressing mode 2 30
- Table 1-11 Condition fields 33
- 1.3.3 Thumb instruction set 34
- 1.4 Silicon revisions 38
- Programmer’s Model 39
- 2 Programmer’s Model 41
- 2.2 Memory formats 42
- 2.3 Instruction length 43
- 2.4 Data types 43
- 2.5 Operating modes 44
- 2.6 Registers 44
- 2: Programmer’s Model 45
- Stack Pointer 46
- Link Register 46
- 2.7 Program status registers 48
- 2.7.3 Reserved bits 49
- 2.8 Exceptions 50
- 2.8.4 Fast interrupt request 52
- 2.8.5 Interrupt request 52
- 2.8.6 Abort 52
- 2.8.7 Software interrupt 53
- 2.8.8 Undefined instruction 53
- 2.8.9 Exception vectors 53
- 2.8.10 Exception priorities 54
- 2.8.11 Exception restrictions 54
- Fast Context Switch Extension 55
- Process IDentifier 55
- 2.10 Reset 56
- 2.11.2 Early termination 57
- Configuration 59
- 3 Configuration 61
- 3: Configuration 62
- 3.3 Registers 63
- 3.3.2 Control Register 64
- 3.3.5 Fault Status Register 66
- 3.3.6 Fault Address Register 67
- 3.3.8 TLB Operations Register 67
- 3.3.10 Register 14, reserved 69
- 3.3.11 Test Register 69
- Instruction and 71
- Data Cache 71
- 4 Instruction and Data Cache 73
- 4.2 IDC validity 74
- Write Buffer 75
- 5 Write Buffer 77
- 5.2 Write buffer operation 78
- The Bus Interface 79
- 6 The Bus Interface 81
- Address and control signals 82
- AMBA Specification (Rev 82
- 6.2 Bus interface signals 83
- 6: The Bus Interface 84
- 6.3 Transfer types 85
- 6.4.1 HADDR[31:0] 87
- 6.4.2 HWRITE 87
- 6.4.3 HSIZE[2:0] 87
- 6.4.4 HBURST[2:0] 88
- 6.4.5 HPROT[3:0] 88
- 6.5.1 HREADY 89
- 6.6 Data buses 90
- 6.6.2 HRDATA[31:0] 91
- 6.6.3 Endianness 91
- 6.7 Arbitration 92
- 6.8 Bus clocking 93
- 6.9 Reset 93
- Memory Management 95
- 7.1.2 Translated entries 98
- 7.3 Address translation 100
- Level one fetch 101
- Level two fetch 101
- 7.3.2 Level one fetch 102
- 7.3.3 Level one descriptor 102
- 7: Memory Management Unit 103
- 7.3.4 Section descriptor 104
- 7.3.8 Level two descriptor 106
- Table indexTranslation base 108
- 7.3.12 Subpages 110
- 7.4 MMU faults and CPU aborts 111
- 7.5.1 Fault Status 112
- 7.6 Domain access control 113
- Access Permission 114
- 7.7 Fault checking sequence 115
- 7.7.2 Translation fault 116
- 7.7.3 Domain fault 116
- 7.7.4 Permission fault 116
- 7.8 External aborts 117
- THIS PAGE IS BLANK 118
- Coprocessor Interface 119
- 8 Coprocessor Interface 121
- 8: Coprocessor Interface 122
- 8.4.1 The coprocessor 125
- 8.4.2 The ARM720T core 125
- 8.4.3 Coprocessor signaling 126
- 8.5 Connecting coprocessors 129
- 8.7 STC operations 130
- 8.8 Undefined instructions 130
- 8.9 Privileged instructions 130
- Debugging Your System 131
- 9 Debugging Your System 133
- 9.1.1 A typical debug system 134
- 9.2 Controlling debugging 135
- 9.2.1 Debug modes 136
- 9.3 Entry into debug state 137
- 9: Debugging Your System 138
- Programming breakpoints 139
- Programming watchpoints 139
- 9.3.5 Clocks 140
- 9.4 Debug interface 141
- Watchpoint unit registers 142
- 9.7 Disabling EmbeddedICE-RT 143
- 9.9 Monitor mode debugging 144
- Abort status register 145
- Debug control register 145
- Debug Communication Channel 146
- Communications through the 146
- Test Access Port 149
- Boundary-Scan Architecture 149
- Test data registers 149
- Instruction register 150
- The TAP controller 150
- 9.12 The TAP controller 151
- 9.13 Public JTAG instructions 152
- 9.13.3 IDCODE (b1110) 153
- 9.13.4 BYPASS (b1111) 153
- 9.13.5 RESTART (b0100) 153
- 9.14 Test data registers 154
- 9.14.3 Instruction register 155
- 9.14.5 Scan chains 1 and 2 156
- 9.15 Scan timing 157
- Debug status register 160
- Exit from debug state 160
- 9.17 Exit from debug state 161
- 9.18.1 Breakpoints 162
- 9.18.2 Watchpoints 162
- 9.18.4 Debug request 163
- 9.18.5 System speed access 163
- Interrupts 164
- Data Aborts 164
- 9.19.2 Interrupts 165
- 9.19.3 Data Aborts 165
- 8 67 5 34 2 01 167
- 9.21 Programming breakpoints 168
- 9.21.2 Software breakpoints 169
- 9.22 Programming watchpoints 170
- 9.23 Abort status register 170
- 9.24 Debug control register 171
- 9.24.1 Disabling interrupts 172
- 9.24.2 Forcing DBGRQ 172
- 9.24.3 Forcing DBGACK 172
- 9.25 Debug status register 173
- 9.27 EmbeddedICE-RT timing 176
- ETM Interface 177
- 10 ETM Interface 179
- ARM720T processor 180
- 10.4 Clocks and resets 181
- 10.5 Debug request wiring 181
- 10.6 TAP interface wiring 181
- Test Support 183
- 11 Test Support 185
- 11: Test Support 186
- 11.3 Test State Register 187
- Translation Table Base 192
- Domain Access Control 192
- Fault Status Register 192
- Fault Address Register 192
- 31 654 0 194
- MVA TAG V P 194
- SBZSIZE_C 194
- Base SBZ 196
- 2526 20 19 1 196
- Appendix A 199
- Signal Descriptions 199
- A Signal Descriptions 201
- A: Signal Descriptions 202
- A.3 JTAG and test signals 203
- A.4 Debugger signals 204
- A.6 ATPG test signals 207
- A.7 Miscellaneous signals 207
- Glossary 209
- See also 216
- ARM DDI 0229B EPSON Index-1 219
- Index-2 EPSON ARM DDI 0229B 220
- ARM DDI 0229B EPSON Index-3 221
- Index-4 EPSON ARM DDI 0229B 222
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