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Atmel
ARM-Based Evaluation Kit AT91SAM9N12-EK
Техническая Спецификация
Техническая Спецификация для Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK
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AT91SAM9N12-EK
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List of Figures
xii
Copyright © 2001-2003 ARM Limited. All rights reserved.
ARM DDI0198D
Figure 3-4
First-level descriptor ................................................................................................. 3-9
Figure 3-5
Section descriptor ................................................................................................... 3-10
Figure 3-6
Coarse page table descriptor .................................................................................. 3-11
Figure 3-7
Fine page table descriptor ...................................................................................... 3-12
Figure 3-8
Section translation .................................................................................................. 3-14
Figure 3-9
Second-level descriptor .......................................................................................... 3-15
Figure 3-10
Large page translation from a coarse page table ................................................... 3-17
Figure 3-11
Small page translation from a coarse page table ................................................... 3-18
Figure 3-12
Tiny page translation from a fine page table ........................................................... 3-19
Figure 3-13
Sequence for checking faults .................................................................................. 3-26
Figure 4-1
Generic virtually indexed virtually addressed cache ................................................. 4-9
Figure 4-2
ARM926EJ-S cache associativity ........................................................................... 4-10
Figure 4-3
ARM926EJ-S cache Set/Way/Word format ............................................................ 4-11
Figure 5-1
Multi-cycle data side TCM access ............................................................................ 5-8
Figure 5-2
Instruction side zero wait state accesses ................................................................. 5-9
Figure 5-3
Data side zero wait state accesses ........................................................................ 5-10
Figure 5-4
Relationship between DRDMAEN, DRDMACS, DRDMAADDR, DRADDR and DRCS ..
5-11
Figure 5-5
DMA access interaction with normal DTCM accesses ........................................... 5-12
Figure 5-6
Generating a single wait state for ITCM accesses using IRWAIT .......................... 5-13
Figure 5-7
State machine for generating a single wait state .................................................... 5-14
Figure 5-8
Loopback of SEQ to produce a single cycle wait state ........................................... 5-14
Figure 5-9
Cycle timing of loopback circuit .............................................................................. 5-15
Figure 5-10
DMA with single wait state for nonsequential accesses ......................................... 5-16
Figure 5-11
Cycle timing of circuit with DMA and single wait state for nonsequential accesses 5-17
Figure 5-12
Zero wait state RAM example ................................................................................. 5-20
Figure 5-13
Byte-banks of RAM example .................................................................................. 5-21
Figure 5-14
Optimizing for power ............................................................................................... 5-23
Figure 5-15
Optimizing for speed ............................................................................................... 5-24
Figure 5-16
TCM subsystem that uses wait states for nonsequential accesses ........................ 5-25
Figure 5-17
Cycle timing of circuit that uses wait states for non sequential accesses ............... 5-26
Figure 5-18
TCM subsystem that uses the DMA interface ........................................................ 5-27
Figure 5-19
TCM test access using BIST .................................................................................. 5-28
Figure 6-1
Multi-layer AHB system example ............................................................................. 6-8
Figure 6-2
Multi-AHB system example ...................................................................................... 6-9
Figure 6-3
AHB clock relationships .......................................................................................... 6-10
Figure 8-1
Producing a coprocessor clock ................................................................................. 8-2
Figure 8-2
Coprocessor clocking ............................................................................................... 8-2
Figure 8-3
LDC/STC cycle timing ............................................................................................... 8-4
Figure 8-4
MCR/MRC cycle timing ............................................................................................. 8-6
Figure 8-5
Interlocked MCR ....................................................................................................... 8-7
Figure 8-6
Latecanceled CDP .................................................................................................... 8-8
Figure 8-7
Privileged instructions ............................................................................................... 8-9
Figure 8-8
Busy waiting and interrupts ..................................................................................... 8-10
Figure 8-9
CPBURST and CPABORT timing ........................................................................... 8-12
Figure 8-10
Arrangement for connecting two coprocessors ...................................................... 8-14
Figure 12-1
Deassertion of STANDBYWFI after an IRQ interrupt ............................................. 12-2
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