Memory Management Unit
11-26 MPC823e REFERENCE MANUAL MOTOROLA
MEMORY MANAGEMENT
11
UNIT
11.6.1.7 MMU DATA REAL PAGE NUMBER REGISTER. The MMU data real page
number (MD_RPN) register contains the physical address and the storage attributes of an
entry to be loaded into a translation lookaside buffer. This register must be written after the
MD_EPN and MD_TWC registers.
RPN—Real Page Number
These bits are the most-significant bits of the page’s physical address.
PP1—Protection for the First 1K Subpage in a 4K Page
This field contains protection code for the first subpage in a 4K page. Depending on Bit 22
of the PP2 field, the same protection code has different protection schemes.
MD_RPN
BIT 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
FIELD RPN
RESET —
R/W R/W
ADDR SPR 798
BIT 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
FIELD RPN PP1 PP2 PP3 PP4 LPS SH CI V
RESET — ————————
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
ADDR SPR 798
NOTE: — = Undefined. The default values depend on the state of system memory.
4K PAGES WITH 1K RESOLUTION PROTECTION
PP1
SETTING
DATA PAGES
PRIVILEGED MODE PROBLEM MODE
00 No access No access
01 Read/Write No access
10 Read/Write Read-only
11 Read/Write Read/Write
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