Memory Management Unit
MOTOROLA MPC823e REFERENCE MANUAL 11-27
MEMORY MANAGEMENT
11
UNIT
PP2—Protection for a Second 1K Subpage in a 4K Page
This field contains a protection code for the second subpage in a 4K page. Depending on
the encoding mode, this field has different meanings.
PAGES OVER 4K WITH 4K RESOLUTION PROTECTION
(EXTENDED ENCODING)
PP1
SETTING
DATA PAGES
PRIVILEGED MODE PROBLEM MODE
00 No access No access
01 Read-only No access
10 Reserved Reserved
11 Reserved Reserved
PAGES OVER 4K WITH 4K RESOLUTION PROTECTION
(POWERPC ENCODING)
PP1
SETTING
DATA PAGES
PRIVILEGED MODE PROBLEM MODE
00 Read/Write No access
01 Read/Write Read-only
10 Read/Write Read/Write
11 Read-only Read-only
4K PAGES WITH 1K RESOLUTION PROTECTION
PP2
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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