MC68EC030CFE25C Freescale Semiconductor, MC68EC030CFE25C Datasheet - Page 321
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MC68EC030CFE25C
Manufacturer Part Number
MC68EC030CFE25C
Description
IC MPU 32BIT ENH 25MHZ 132-CQFP
Manufacturer
Freescale Semiconductor
Specifications of MC68EC030CFE25C
Processor Type
M680x0 32-Bit
Speed
25MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
132-CQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
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Part Number:
MC68EC030CFE25C
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9.5 T R A N S L A T I O N TABLE DETAILS
9.5.1 Descriptor Details
9.5.1.1 DESCRIPTOR FIELD DEFINITIONS.
9-20
The details of translation tables and their use include detailed descriptions
the protection techniques available with the MC68030 MMU.
The descriptor details include detailed descriptions of the short- and long-
format descriptors used in the translation trees. The fields that apply to all
than one type of descriptor. This section lists these fields and describes the
of the descriptors, table searching, translation table structure variations, and
descriptors are described in the first paragraph.
use of each field.
DT
PHYSICAL ADDRESS
troller without translation.
This 2-bit field contains the descriptor type; the first two types apply to
the descriptor itself. The other two types apply to the descriptors in the
table at the next level of the tree. The values are defined as follows:
This 24-bit field contains the physical address bits (A31-A8) from the page
descriptor corresponding to the logical address. When the page size is
larger than 256 bytes, not all bits in the physical address field are used.
All page index bits of the logical address are transferred to the bus con-
$0
$1
This code identifies the current descriptor as an invalid descriptor.
A table search ends when an invalid descriptor is encountered.
This code identifies the current descriptor as a page descriptor.
The page descriptor is a normal page descriptor when it resides
A table search ends when a page descriptor of either type is en-
INVALID
PAGE DESCRIPTOR
in a page table (in the bottom level of the translation tree). A page
descriptor at a higher level is an early termination page descriptor.
countered.
MC68030 USER'S MANUAL
All descriptor fields are used in more
MOTOROLA
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