Embedded Systems Design, 2nd Edition

Memory systems 83

• Error detecting memory

With this type of memory, additional bits are added to the

data word to provide protection from multiple bit failures.

Depending on the number of bits that are used and the

coding techniques that use the additional bits, protection

can be provided for a larger number of error conditions. The

disadvantages are the additional memory bits needed along

with the complex controllers required to create and com-

pare the codes.

• Error detecting and correction

This takes the previous protection one step further and uses

the codes not only to detect the error but correct it as well.

This means that the system will carry ...