Motorola MPC823e User Manual

Memory Management Unit
11-12 MPC823e REFERENCE MANUAL MOTOROLA
MEMORY MANAGEMENT
11
UNIT
PP3—Protection for the Third 1K Subpage in a 4K Page
This field contains protection code for the third subpage in a 4K page. Depending on the
encoding mode, this field has different meanings.
PP2 SETTING PAGES OVER 4K WITH 4K RESOLUTION PROTECTION
0x PP1 contains PowerPC encoding
1x PP1 contains Extended Encoding
x1 Page is writable
x0 Page is write-protected
4K PAGES WITH 1K RESOLUTION PROTECTION
PP3
SETTING
INSTRUCTION PAGES DATA PAGES
PRIVILEGED MODE PROBLEM MODE PRIVILEGED MODE PROBLEM MODE
00 No access No access No access No access
01 Executable No access Read/Write No access
10 Executable Executable Read/Write Read-only
11 Executable Executable Read/Write Read/Write
PAGES OVER 4K WITH 4K RESOLUTION PROTECTION
PP3 SETTING CASE: Mx_CTR (PPCS) = 0
0x First subpage not valid
1x First subpage valid
x0 Second subpage not valid
x1 Second subpage valid

Motorola MPC823e Specifications

General

Brand	Motorola
Model	MPC823e
Category	Computer Hardware
Language	English