Virtual address
31
20 19
12 11
0
First-level table index
First-level descriptor
Second-level table index
Second-level translation table
First-level translation table
Second-level descriptor
Preliminary
System MMU
www.ti.com
1.4.3.1.2.8 Two-Level Translation
Two-level translation is used when fine-grain granularity is required, that is, when memory sections
smaller than 1MB are needed. In this case, the first-level descriptor provides a pointer to the base address
of a second-level translation table. This second-level table is indexed by bits 19 to 12 of the virtual
address.
Figure 1-19. Two-Level Translation
Each second-level translation table describes the translation of 1MB of address space in pages of 64KB
(large page) or 4KB (small page). It consists of 256 second-level descriptors describing 4KB each.
NOTE:
In the case of a large page, the same descriptor must be repeated 16 times. If an access
points to a descriptor that is not initialized, the MMU will behave in an unpredictable way."
124
Chip Level Resources
SPRUGX9 – 15 April 2011
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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