MC68030FE25C Freescale Semiconductor, MC68030FE25C Datasheet - Page 341
MC68030FE25C
Manufacturer Part Number
MC68030FE25C
Description
IC MPU 32BIT ENHANCED 132-CQFP
Manufacturer
Freescale Semiconductor
Specifications of MC68030FE25C
Processor Type
M680x0 32-Bit
Speed
25MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
132-CQFP
Family Name
M68000
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
25MHz
Instruction Set Architecture
RISC
Supply Voltage 1 (typ)
5V
Operating Supply Voltage (max)
5.25V
Operating Supply Voltage (min)
4.75V
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
132
Package Type
CQUAD
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Compliant
Available stocks
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Part Number
Manufacturer
Quantity
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Company:
Part Number:
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Manufacturer:
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9
9.5.3.5 DYNAMIC ALLOCATION OF TABLES.
9.5.4 Detail of Table Search Operations
9-40
the areas of memory that are used by a task over any extended period of
translation tree for a task.
than guessing what the memory usage requirements of the task are, the
the task requests access to the areas mapped by these branches. This tech-
for each task, conserving physical memory utilization and minimizing op-
translation tree can be dynamically allocated by the operating system based
on requests for access to particular areas.
As in the case of demand paging, it is difficult, if not impossible, to predict
time. Instead of attempting to predict the requirements of the task, the op-
erating system performs no action for a task until a demand is made re-
questing access to a previously unused area or an area that is no longer
execute a' previously unexecuted task that has no translation tree. Rather
operating system creates a translation tree for the task that maps one page
corresponding to the initial value of the program counter for that task, and
other branches of the translation tree for this task remain unallocated until
erating system overhead.
The table search operations described in this section are shown in detail in
it is not required that a complete translation tree exist for an active task. The
resident in memory. This same technique can be used to efficiently create a
For example, consider an operating system that is preparing the system to
possibly, one page corresponding to the initial stack pointer of the task. All
nique allows the operating system to construct a minimal translation tree
Figures 9-25-9-29.
MC68030 USER'S MANUAL
Similar to the case of paged tables,
MOTOROLA
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