Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Ficha De Dados
Códigos do produto
AT91SAM9N12-EK
Memory Management Unit
ARM DDI0198D
Copyright © 2001-2003 ARM Limited. All rights reserved.
3-17
Figure 3-10 Large page translation from a coarse page table
Because the upper four bits of the page index and low-order four bits of the coarse page
table index overlap, each coarse page table entry for a large page must be duplicated 16
times (in consecutive memory locations) in the coarse page table.
table index overlap, each coarse page table entry for a large page must be duplicated 16
times (in consecutive memory locations) in the coarse page table.
If a large page descriptor is included in a fine page table, the high-order six bits of the
page index and low-order six bits of the fine page table index overlap. Each fine page
table entry for a large page must therefore be duplicated 64 times.
page index and low-order six bits of the fine page table index overlap. Each fine page
table entry for a large page must therefore be duplicated 64 times.
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
16 15
12 11
0
L2
table index
Page index
Coarse page table base address
31
10 9 8
5 4 3 2 1 0
Domain
1
0 1
Coarse page table base address
31
10 9
2 1 0
L2 table index
0 0
Page base address
31
16 15
12 11 10 9 8 7 6 5 4 3 2 1 0
AP3 AP2 AP1 AP0 C B 0 1
Page base address
31
16 15
0
Page index
First-level descriptor
Second-level descriptor
Physical address