Filter
Top Products
7: Memory Management Unit
7-12 EPSON ARM720T CORE CPU MANUAL
7.3.9 Translating large page references
Figure 7-10 shows the complete translation sequence for a 64KB large page.
Figure 7-10 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.
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.
31 14 13 0
Translation base
31 14 13 2 1 0
00
Table indexTranslation base
Modified virtual address
Translation table base
31 2019 0
Table index Page index
Level one descriptor
Physical address
31 0
Coarse page table base address
Domain
11
213458910
L2
table index
16 15 12 11
31 1615 0
Page indexPage base address
Level two descriptor
31 0
Coarse page table base address
L2 table index
0
21910
31 1615 0
ap3
Page base address
0
0
ap2 ap1 ap0
1
0
CB
123456789101112