Three distinct levels can be distinguished in the design of digital systems: architecture, implementation and realization. Description methods are available at each level assuming that at the realization level components such as nands and nors are used. The introduction of programmable components, such as microprocessors and programmable input/output chips, which now form the basis elements at the realization level, forces to reconsider these description methods.
- model of a generalized chip structure
- programmable component
- formal description
- Design method