Fundamentals of Flash Memory and Other Solid State Memory Technologies 93
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two-level MLC the guaranteed minimum is almost always 10
4
cycles, or one tenth the
number of SLC.
The next most important reliability specifi cation is data retention, which is the
manufacturer’s guarantee of how long bits will remain reliable if they are never
rewritten in a worst-case environment. A time of 10 years is the norm here, which
is usually longer than the life of the device that is using the fl ash.
In order to really understand endurance, an engineer must know the erase and
programming specifi cations of the device. Flash chips (NAND and NOR) ...
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