MC68060RC50 Freescale Semiconductor, MC68060RC50 Datasheet - Page 85
MC68060RC50
Manufacturer Part Number
MC68060RC50
Description
IC MPU 32BIT 50MHZ 206-PGA
Manufacturer
Freescale Semiconductor
Specifications of MC68060RC50
Processor Type
M680x0 32-Bit
Speed
50MHz
Voltage
3.3V
Mounting Type
Surface Mount
Package / Case
206-PGA
Family Name
M68000
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
50MHz
Instruction Set Architecture
RISC
Supply Voltage 1 (typ)
3.3V
Operating Supply Voltage (max)
3.465V
Operating Supply Voltage (min)
3.135V
Operating Temp Range
0C to 110C
Operating Temperature Classification
Commercial
Mounting
Through Hole
Pin Count
206
Package Type
PGA
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Features
-
Lead Free Status / Rohs Status
Compliant
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Memory Management Unit
4.2.4 Variations in Translation Table Structure
Several aspects of the MMU translation table structure are software configurable, allowing
the system designer flexibility to optimize the performance of the MMUs for a particular sys-
tem. The following paragraphs discuss the variations of the translation table structure.
4.2.4.1 INDIRECT ACTION. The MC68060 provides the ability to replace an entry in a page
table with a pointer to an alternate entry. The indirection capability allows multiple tasks to
share a physical page while maintaining only a single set of history information for the page
(i.e., the modified indication is maintained only in the single descriptor). The indirection
capability also allows the page frame to appear at arbitrarily different addresses in the logical
address spaces of each task.
Using the indirection capability, single entries or entire tables can be shared between multi-
ple tasks. Figure 4-13 illustrates two tasks sharing a page using indirect descriptors.
4-16
TASK A
TASK B
ADDRESS OFFSET =
TABLE ENTRY # =
$76543210 =
Figure 4-13. Translation Table Using Indirect Descriptors
ROOT POINTER
ROOT POINTER
0 1 1 1 0 1 1 0 0 1 0 1 0 1 0 0 0 0 1 X X X X X X X X X X X X X
ROOT INDEX
$EC
$3B
$3B
M68060 USER’S MANUAL
ROOT-LEVEL
POINTER INDEX
TABLE $00
$00001800
TABLES
$15
$54
LOGICAL ADDRESS
PAGE INDEX
$15
$01
$04
POINTER-LEVEL
TABLE $3B
TABLE $00
$00003000
TABLE $7F
TABLES
PAGE OFFSET
$01
FRAME ADDRESS
PAGE-LEVEL
TABLE $15
TABLE $1F
TABLE $00
$80000010
TABLES
MOTOROLA
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