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Coarse page table descriptor bit assignments are described in Table 7-5.
Bits
31:10
9
8:5
4
3:2
1:0
7.3.6
Fine page table descriptor
A fine page table descriptor provides the base address of a page table that contains level two
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 7-7 shows the
format of a fine page table descriptor.
31
If a fine page table descriptor is returned from the level one fetch, a level two fetch
Note:
is initiated.
Fine page table descriptor bit assignments are described in Table 7-6.
Bits
31:12
11:9
8:5
4
3:2
1:0
ARM720T CORE CPU MANUAL
Table 7-5 Coarse page table descriptor bits
Description
These bits form the base for referencing the level two
descriptor (the coarse page table index for the entry is
derived from the MVA)
Always written as 0
These bits specify one of the 16 possible domains
(held in the Domain Access Control Registers) that
contain the primary access controls
Always written as 1
Always written as 0
These bits must be 01 to indicate a coarse page table
descriptor
Fine page table base address
Figure 7-7 Fine page table descriptor
Table 7-6 Fine page table descriptor bits
Description
These bits form the base for referencing the level two
descriptor (the fine page table index for the entry is
derived from the MVA)
Always written as 0
These bits specify one of the 16 possible domains
(held in the Domain Access Control Registers) that
contain the primary access controls
Always written as 1
Always written as 0
These bits must be b11 to indicate a fine page table
descriptor
EPSON
7: Memory Management Unit
12 11
9 8
5 4 3 2 1 0
SBZ
Domain
1
SBZ
1 1
7-9
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