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MMU ARM920T PROCESSOR
3-14
TRANSLATING SMALL PAGE REFERENCES
Figure 3-8 illustrates the complete translation sequence for a 4KB small page. 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 0
Table index
1920
Page index
0
31 0
Translation base
Translation table base
1314
31 0
Translation base
1314 12
0Table index
18
Level one descriptor
1
31 0
Coarse page table base address
12
0Domain
345
1
10 9 8
31 0
Page base address
Physical address
Page index
12 11
L2 table index
Modified virtual address
8
12
12
0
31 0
Coarse page table base address
910 12
0L2 table index
Level two descriptor
0
31 0
Page base address
12
1ap3
345
C
10 9 81112
ap2 ap1 ap0
7 6
B
12 11
Figure 3-8. Small Page Translation from a Coarse Page Table