MC68030FE33C Freescale Semiconductor, MC68030FE33C Datasheet - Page 334

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MC68030FE33C

Manufacturer Part Number
MC68030FE33C
Description
IC MPU 32BIT ENHANCED 132-CQFP
Manufacturer
Freescale Semiconductor
Datasheet

Specifications of MC68030FE33C

Processor Type
M680x0 32-Bit
Speed
33MHz
Voltage
5V
Mounting Type
Surface Mount
Package / Case
132-CQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Features
-

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9.5.3 Variations in Translation Table Structure
9.5.3.1 EARLY TERMINATION AND C O N T I G U O U S MEMORY.
MOTOROLA
the MMU for a particular system. The following paragraphs discuss the var-
the ability to map a contiguous range of the logical address space (an integral
would normally contain a table pointer, thereby deleting a subtree of the
table.
The table search ends when the search encounters a page descriptor, whether
the translation tree.
table (i.e., the MC68030 has not encountered a TIx field of zero) is called an
An early termination page descriptor takes the place of many page descriptors
termination page descriptor is a long format, the limit field is applied to the
able, allowing the system designer flexibility to optimize the performance of
with a single descriptor. This is done by placing the code for page descriptor
($1) in the descriptor type (DT) field of a descriptor at a level of the tree that
or not the page descriptor is in a page descriptor table at the lowest level of
Termination of the table search by a page descriptor in a pointer descriptor
early termination. The terminating page descriptor is called an early termi-
on which the descriptor has been placed, and on any branches from that
scriptors for additional information.
of 2 PS+n bytes.
Many aspects of the MMU translation tree structure are software configur-
iations of the tree structure from the general structure discussed previously.
number of logical pages) to an equivalent contiguous physical address range
nation page descriptor.
in a translation table. It applies to all pages that would exist on the branch
branch. An early termination page descriptor can be used where contiguous
pages in physical memory correspond to contiguous logical pages. If an early
next i n d e x field of the logical address. This allows the number of pages
mapped contiguously to be restricted. Refer to 9.1.2 Translation Table De-
If n low-order bits of the logical page address are unused when a page
descriptor encoding is encountered, the single descriptor creates a mapping
of a contiguous region of the logical address space starting at the logical
page address (with n unused bits set to zero) to a contiguous region in the
physical address space starting at the page frame base address with a size
MC68030 USER'S MANUAL
The MMU provides
9-33

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