Motorola MPC823e Reference Manual page 231

PAGES OVER 4K WITH 4K RESOLUTION PROTECTION
PP3 SETTING
00
01
10
11
PP4—Protection for the Fourth 1K Subpage in a 4K Page
This field contains protection code for the fourth subpage in a 4K page. Depending on the
encoding mode, this field has different meanings.
PP4 INSTRUCTION PAGES
SETTING
PRIVILEGED MODE
00 No access
01 Executable
10 Executable
11 Executable
PAGES OVER 4K WITH 4K RESOLUTION PROTECTION
PP4 SETTING
0x
1x
x0
x1
MOTOROLA
CASE: Mx_CTR (PPCS) = 1
No hit for any state
Hit only for problem accesses
Hit only for privilege accesses
Hit for both problem and privilege accesses
4K PAGES WITH 1K RESOLUTION PROTECTION
PROBLEM MODE
No access
No access
Executable
Executable
CASE: Mx_CTR (PPCS) = 0
Third subpage not valid
Third subpage valid
Fourth subpage not valid
Fourth subpage valid
MPC823e REFERENCE MANUAL
Memory Management Unit
DATA PAGES
PRIVILEGED MODE PROBLEM MODE
No access No access
Read/Write No access
Read/Write Read-only
Read/Write Read/Write
11-13