參數(shù)資料
型號： P610ARM-KW
廠商： Zarlink Semiconductor Inc.
英文描述： General purpose 32-bit microprocessor
中文描述： 通用32位微處理器
文件頁數(shù)： 113/173頁
文件大?。?/td> 897K
代理商： P610ARM-KW
Memory Management Unit
ARM610 Data Sheet
9-9
9.9
Level Two Descriptor
If the Level One fetch returns a Page Table Descriptor, this provides the base address
of the page table to be used. The page table is then accessed as described in
9-7: Small page translation
on page 9-10, and a Page Table Entry, or Level Two
Descriptor, is returned. This in turn may define either a Small Page or a Large Page
access. The figure below shows the format of Level Two Descriptors.
·
Figure
Figure 9-6: Page Table Entry (Level Two descriptor)
The two least significant bits indicate the page size and validity, and are interpreted as
follows.
Bit 2 B - Bufferable
buffer (if the write buffer is enabled).
: indicates that data at this address will be written through the write
Bit 3 C - Cacheable
cache is enabled).
: indicates that data at this address will be placed in the IDC (if the
Bits 11:4
interpretation of these bits is described earlier in
Descriptor Bits [1:0]
on page 9-6.
specify the access permissions (ap3 - ap0) for the four sub-pages and
·
Table 9-1: Interpreting Level One
For large pages,
bits 15:12
are programmed as 0
Bits 31:12
corresponding bits of the physical address - the physical page number. (The page
index is derived from the virtual address as illustrated in
translation
on page 9-10 and
·
Figure 9-8: Large page translation
(small pages) or bits
31:16
(large pages) are used to form the
·
Figure 9-7: Small page
on page 9-11).
0
1
2
3
4
5
8
9
10
11
12
19
20
31
0
Fault
Large Page
Small Page
Reserved
0
0 1
1 0
1 1
C B
ap3
Large Page Base Address
Small Page Base Address
6
7
15
16
ap3
ap2
ap2
ap1
ap1
ap0
ap0 C B
Value
Meaning
Notes
0 0
Invalid
Generates a Page Translation Fault
0 1
Large Page
Indicates that this is a 64Kb Page
1 0
Small Page
Indicates that this is a 4 Kb Page
1 1
Reserved
Reserved for future use
Table 9-3: Interpreting page table entry bits 1:0
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