ABSTRACT
Electronic logic operations are governed by the same principles and laws as the propositional statements we use in everyday life, as the latter can be regarded as binary functions that are either true or false. An electronic circuit that operates on binary data is called a digital logic system. The circuits within the system that carry out the elementary logical operations are called gates. Three general types of logic system can be identified, namely: a general logic system, an accumulator operation, and a storage operation. The three types of logic systems are inter-related in a most interesting way. A combinational logic circuit can be converted into a sequential system by applying feedback from some of the outputs to form additional internal inputs. A simple sequential circuit has memory properties and finally a memory circuit can be organized as a combinational logic function. This chapter examines these applications.
