Epson ARM720T Manuel D’Utilisation
7: Memory Management Unit
ARM720T CORE CPU MANUAL
EPSON
7-13
7.3.10
Translating small page references
Figure 7-11 shows the complete translation sequence for a 4KB small page.
Figure 7-11 Small page translation from a coarse page table
If a small page descriptor is included in a fine page table, the upper two bits of the page index
and low-order two bits of the fine page table index overlap. Each fine page table entry for a
small page must therefore be duplicated four times.
31
14 13
0
Translation base
31
14 13
2 1 0
0 0
Table index
Translation base
Modified virtual address
Translation table base
31
20 19
0
Table index
Page index
Level one descriptor
Physical address
31
0
Coarse page table base address
Domain 1
1
2 1
3
4
5
8
9
10
Level 2
table index
12 11
31
0
Page index
Page base address
Level two descriptor
31
0
Coarse page table base address
L2 table index
0
2 1
9
10
31
0
ap3
Page base address
0
0
ap2 ap1 ap0
0
1
C B
1
2
3
4
5
6
7
8
9
10
11
12
11
12