October 2002
Intermediate to advanced
430 pages
14h 57m
English
Content preview from Embedded Systems Design, 2nd Edition
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244 Embedded systems design
amounts of system RAM when, in reality, it does not. This virtual
memory technique is frequently used in workstations and in the
UNIX operating system. Its appeal in embedded systems is lim-
ited because of the potential delay in accessing memory that can
occur if a block is swapped out to disk.
TOTAL RAM
NEEDED FOR
PROGRAM
TOTAL RAM
IN SYSTEM
PROGRAM
BLOCKS ON
DISK
5 BLOCKS 2 BLOCKS
3 BLOCKS
LOGICAL
ADDRESSES
PHYSICAL
ADDRESSES
MEMORY
MANAGEMENT
UNIT
OPERATING SYSTEM
SWAPS OUT BLOCKS
AS NEEDED
Using virtual memory to support large applications
Choosing an operating system
Comparing an operating system from 10 years ago with one
offered ...
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