Digi NS9750 User Manual
Page 113
w w w . d i g i e m b e d d e d . c o m
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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