MC68LC060RC50 Freescale Semiconductor, MC68LC060RC50 Datasheet - Page 90
MC68LC060RC50
Manufacturer Part Number
MC68LC060RC50
Description
IC MPU 32BIT 68K 50MHZ 206-PGA
Manufacturer
Freescale Semiconductor
Specifications of MC68LC060RC50
Processor Type
M680x0 32-Bit
Speed
50MHz
Voltage
3.3V
Mounting Type
Surface Mount
Package / Case
206-PGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
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tion at any level. Page descriptors also contain a supervisor-only (S) bit that can limit access
to programs operating at the supervisor privilege level.
The protection mechanisms can be used individually or in any combination to protect:
4.2.6.1 SUPERVISOR AND USER TRANSLATION TABLES. One
supervisor and user address spaces from unauthorized accesses is to use separate super-
visor and user translation tables. Separate trees protect supervisor programs and data from
accesses by user programs and user programs and data from access by supervisor pro-
grams. Supervisor programs may access user space through the MOVES instruction. With
a user-space SFC/DFC, the MOVES access will be translated according to the user-mode
translation tables. This translation table can be common to all tasks. Figure 4-16 illustrates
separate translation tables for supervisor accesses and for two user tasks that share the
common supervisor space. Each user task has a translation table with unique mappings for
the logical addresses in its user address space.
MOTOROLA
• Supervisor address space from accesses by user programs.
• User address space from accesses by other user programs.
• Supervisor and user program spaces from write accesses (implicitly supported by
• One or more pages of memory from write accesses.
designating all memory pages used for program storage as write protected).
URP FOR TASK 'A'
URP FOR TASK 'B'
COMMON SRP
FOR TASK 'A'
FOR TASK 'B'
Figure 4-16. Translation Table Structure for Two Tasks
POINTER
M68060 USER’S MANUAL
SUPERVISOR A LEVEL TABLE
USER A LEVEL TABLE
USER A LEVEL TABLE
•
•
•
•
•
•
•
•
•
Memory Management Unit
way
TRANSLATION
TABLE FOR
ACCESSES
TRANSLATION
TABLE FOR
TASK 'A'
TRANSLATION
TABLE FOR
TASK 'B'
ALL SUPERVISOR
of
protecting
4-21
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