October 2002
Intermediate to advanced
430 pages
14h 57m
English
Content preview from Embedded Systems Design, 2nd Edition
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Memory systems 125
contents of the ROM is copied into the RAM area where it
can be executed. This part is common to both implementa-
tions.
• With a hardware assisted implementation, the address
decode logic is used to switch the address decode to select
the RAM instead of the ROM. As a result, any access to the
ROM will be automatically switched to the RAM and will
execute faster and without any change in the software as the
addressing has not changed. This also provides an option to
execute the code out of ROM or RAM and this can be used
to isolate problems when executing out of RAM. If there are
software-based timing routines in the ROM code, then this ...
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