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Memory Management Unit
ARM DDI 0192A
Copyright © ARM Limited 1997, 1998, 2000. All rights reserved.
6-7
6.4
Level 1 descriptor
The level 1 descriptor returned is either a page table descriptor or a section descriptor,
and its format varies accordingly. Figure 6-3 illustrates the format of level 1 descriptors.
Figure 6-3 Level 1 descriptors
The two least significant bits indicate the descriptor type and validity, and are
interpreted as listed in Table 6-2.
31
20 19
00
10 09
04
Page table base address
08
03 02 01
Section base address
1
12 11
Fault
0
1
Page
Domain
1
Domain
C B 1
Section
AP
SBZ
Reserved
05
0
1
1
0
0
SBZ
Table 6-2 Interpreting level 1 descriptor bits [1:0]
Value
Meaning
Notes
0 0
Invalid
Generates a section translation fault
0 1
Page
Indicates that this is a page descriptor
1 0
Section
Indicates that this is a section descriptor
1 1
Reserved
Reserved for future use
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