Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet
Product codes
AT91SAM9N12-EK
Memory Management Unit
3-14
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ARM DDI0198D
Figure 3-8 Section translation
3.2.8
Second-level descriptor
If the first-level 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 second-level descriptor is returned. Figure 3-9 on page 3-15 shows
the format of second-level descriptors.
descriptor, this provides the base address of the page table to be used. The page table is
then accessed and a second-level descriptor is returned. Figure 3-9 on page 3-15 shows
the format of second-level descriptors.
Table index
31
20 19
0
Section index
Translation base
31
14 13
0
Translation base
31
14 13
2 1 0
Table index
0 0
Modified virtual address
Translation table base
Section base address
31
20 19
12 11 10 9 8
5 4 3 2 1 0
SBZ
AP 0
Domain
1 C B 1 0
Section base address
31
20 19
0
Section index
Section first-level descriptor
Physical address