Models for Sequential Circuits
Block diagram representation: Figure 6.1
State Tables and Diagrams: the functional relationship that exists among the input, output, present state, and next state is illustrated by either the state table or the state diagram.
The state diagram is a graphical representation of a sequential circuit in which the states are represented by circles and the state transitions (the transfer from the present state y to the next state Y) are shown by arrows.
The state table lists the inputs across the top, the outputs along the left side, with the entries in the table being the next state and output for each input and present state.