Digi NS9750 - Manual (Page 113)

w w w . d i g i e m b e d d e d . c o m 8 9
W o r k i n g w i t h t h e C P U
Translating section references
Figure 31 shows the complete section translation sequence.
Figure 31: Section translation
Second-level descriptor
The base address of the page table to be used is determined by the descriptor
returned (if any) from a first-level fetch — either a coarse page table descriptor or a
fine page table descriptor. The page table is then accessed and a second-level
descriptor returned.
31 14 13 0
Translation base
1
Translation table base
31 14 13 0
Translation base
2
Table index 0 0
31 20 19 0
Table index Section index
Section first-level descriptor
31 20 19 0
Section base address
2
0 1
1 3 4 5
SBZ Domain AP 1 C B 0
31 20 19 0
Section base address
Physical address
Section index
8