On the other hand, NOR Flash memories are capable of a very fast read access
time (less than 100 ns); they offer a programming time which is comparable to that
of the NAND (but the amount of programmed bit per operation is considerably
smaller) but they feature an erase time which is some order of magnitudes higher
than the NAND. For these reasons, and due to the capability to “execute in place”
(XIP), NOR Flash memories are more suitable for code storage and they will not be
considered in the following sections.