Flash
Memory: Theory and Applications
Data Protection
Protection
of the nonvolatile data in a flash device has always been an important
consideration. Several Flash products feature dynamic hardware block-locking, so
that critical code can be kept secure while non-locked blocks are programmed and
erased. This locking scheme offers two levels of protection. The first allows
software-only control of block locking (useful for frequently-changed data
blocks), while the second requires hardware interaction before locking can be
changed, protecting infrequently-changed code blocks. This locking capability is
different by product family.
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