State Diagram

The state diagram for the vending machine example is shown in Figure 51.

**Figure 51:** Vending machine state diagram.
$\begin{figure} \begin{center} \epsfig{file=images/vend-state.eps}\end{center}\end{figure}$

The state diagram is equivalent to the next state/output table.

Note:

States are symbolized by a circle or box.
Lines or branches represent state transitions, with the logical condition required for the transition written next to it.
Moore Outputs can be specified inside the states.

There are variations on this. For example, outputs may be specified on the branches. See ELM, Section 7.2.1.

ANU Engineering - ENGN3213