Classifications of Memory:
Many
types of memory devices are available for use in modern computer systems. As an
embedded software engineer, you must be aware of the differences between them
and understand how to use each type effectively. In our discussion, we will
approach these devices from a software viewpoint. As you are reading, try to
keep in mind that the development of these devices took several decades. The
names of the memory types frequently reflect the historical nature of the
development process.
Most
software developers think of memory as being either RAM or ROM. But, in fact,
there are subtypes of each class, and even a third class of hybrid memories
that exhibit some of the characteristics of both RAM and ROM. In a RAM device,
the data stored at each memory location can be read or written, as desired. In
a ROM device, the data stored at each memory location can be read at will, but
never written. The hybrid devices offer ROM-like permanence, but under some
conditions it is possible to overwrite their data provides a classification
system for the memory devices that are commonly found in embedded systems.
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