Digi NS9750 - Manual (Page 117)

w w w . d i g i e m b e d d e d . c o m 9 3
W o r k i n g w i t h t h e C P U
If the 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 overlap. Each fine page
table entry for a large page must be duplicated 64 times.
Translating small page references
Figure 34: Small page translation from a coarse page table
31 14 13 0
Translation base
1
Translation table base
31 14 13 0
Translation base
2
Table index 0 0
31 2019 0
Table index Page index
First-level descriptor
31 0
Coarse page table base address
2
0 1
1 3 4 5
Domain 1
31 0
Coarse page table base address
Level two
table index
12 11
Modified virtual address
8 9 10
1 2 9 10
31 121110 9 8 7 6 5 4 3 2 1 0
0 0 L2 table index
0 1 B C AP0 AP1 AP2 AP3 Page base address
Page base address
31 0 1211
Page index
Physical address
Second-level descriptor