Digi NS9215 - Manual (Page 117)

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W O R K I N G W I T H T H E C P U
MemoryManagement Unit (MMU)
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Translating
sequence for small
page references
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 be duplicated four times.
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