Digi NS9750 - Manual (Page 118)

M e m o r y M a n a g e m e n t U n i t ( M M U )
9 4 N S 9 7 5 0 H a r d w a r e R e f e r e n c e
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.
Translating tiny page references
Figure 35: Tiny page translation from a fine page table
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 Page index
First-level descriptor
31 0
Fine page table base address
2
1 1
1 3 4 5
Domain 1
31 0
Fine page table base address
Level two
table index
10 9
Modified virtual address
8 11 12
1 2 11 12
31 10 9 6 5 4 3 2 1 0
0 0 L2 table index
1 1 B C AP Page base address
Page base address
31 0 10 9
Page index
Physical address
Second-level descriptor