Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet
Product codes
AT91SAM9N12-EK
Memory Management Unit
ARM DDI0198D
Copyright © 2001-2003 ARM Limited. All rights reserved.
3-19
3.2.11
Translating tiny page references
Figure 3-12 shows the complete translation sequence for a 1KB tiny page.
Figure 3-12 Tiny page translation from a fine page table
Page translation involves one additional step beyond that of a section translation. The
first-level descriptor is the fine page table descriptor and this is used to point to the
first-level descriptor.
first-level descriptor is the fine page table descriptor and this is used to point to the
first-level descriptor.
Translation base
31
14 13
0
Translation base
31
14 13
2 1 0
Table index
0 0
Modified virtual address
Translation table base
Table index
31
20 19
10 9
0
Level two
table index
Page index
Fine page table base address
31
12
9 8
5 4 3 2 1 0
Domain
1
1 1
Fine page table base address
31
12 11
2 1 0
L2 table index
0 0
Page base address
31
10 9
6 5 4 3 2 1 0
AP C B 1 1
Page base address
31
10 9
0
Page index
First-level descriptor
Second-level descriptor
Physical address
11