MC68040FE25A Freescale Semiconductor, MC68040FE25A Datasheet - Page 66
![no-image](/images/manufacturer_photos/0/2/262/freescale_semiconductor_sml.jpg)
MC68040FE25A
Manufacturer Part Number
MC68040FE25A
Description
IC MICROPROCESSOR 32BIT 184-CQFP
Manufacturer
Freescale Semiconductor
Datasheet
1.MC68EC040FE33A.pdf
(442 pages)
Specifications of MC68040FE25A
Processor Type
M680x0 32-Bit
Speed
25MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
184-CQFP
Family Name
M68000
Device Core
ColdFire
Device Core Size
32b
Frequency (max)
25MHz
Instruction Set Architecture
RISC
Operating Temp Range
0C to 70C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
184
Package Type
CQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-
Lead Free Status / Rohs Status
Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MC68040FE25A
Manufacturer:
Freescale Semiconductor
Quantity:
10 000
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Using the indirection capability, single entries or entire tables can be shared between
multiple tasks. Figure 3-14 illustrates two tasks sharing a page using indirect descriptors.
When the M68040 has completed a normal table search, it examines the PDT field of the
last entry fetched from the page tables. If the PDT field contains an indirect ($2) encoding,
it indicates that the address contained in the highest order 30 bits of the descriptor is a
pointer to the page descriptor that is to be used to map the logical address. The processor
then fetches the page descriptor from this address and uses the physical address field of
the page descriptor as the physical mapping for the logical address.
The page descriptor located at the address given by the indirect descriptor must not have
a PDT field with an indirect encoding (it must be either a resident descriptor or invalid).
Otherwise, the descriptor is treated as invalid, and the M68040 creates an ATC entry with
a signaled error condition (R-bit in MMUSR is clear).
MOTOROLA
SUPERVISOR
MODE
ADDRESS OFFSET =
TABLE ENTRY # =
$76543210 =
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
SRP
ROOT INDEX
Freescale Semiconductor, Inc.
Figure 3-13. Example Translation Table
$EC
For More Information On This Product,
$3B
$3B
Go to: www.freescale.com
M68040 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
TABLES
3- 17
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