Table 3-5 Coarse Page Table Descriptor Bits; Figure 3-7 Fine Page Table Descriptor - ARM ARM926EJ-S Technical Reference Manual

Memory Management Unit
3.2.6 Fine page table descriptor
31
3-12
Coarse page table descriptor bit assignments are described in Table 3-5.
Bits Description
[31:10] These bits form the base for referencing the second-level descriptor (the coarse
page table index for the entry is derived from the MVA)
[9] Always written as 0
[8:5] These bits specify one of the 16 possible domains (held in the domain access
control registers) that contain the primary access controls
[4] Always written as 1
[3:2] Always written as 0
[1:0] These bits must be 01 to indicate a coarse page table descriptor
A fine page table descriptor provides the base address of a page table that contains
second-level descriptors for large page, small page, or tiny page accesses. Fine page
tables have 1024 entries, splitting the 1MB that the table describes into 1KB blocks.
Figure 3-7 shows the format of a fine page table descriptor.
Fine page table base address
Note
If a fine page table descriptor is returned from the first-level fetch, a second-level fetch
is initiated.
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Table 3-5 Coarse page table descriptor bits

12 11 9 8
SBZ Domain

Figure 3-7 Fine page table descriptor

5 4 3 2 1 0
1 SBZ 1 1
ARM DDI0198D