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\section{State Machines}
There are 3 types of state machines.
\begin{center}
\ttfamily
\begin{tikzpicture}[
node distance = 3mm,
box/.style = {
draw = black, thick, fill = gray!20!white,
minimum width = 20mm, minimum height = 8mm,
}
]
% mealey
\begin{scope}
\node[box] (G) {\large G};
\node[box, above = of G] (F) {\large F};
\node[box, below = of G] (Z) {\large Z};
\node[above = of F] {\large Mealey};
\draw[very thick, ->, hsr-blue] (F.east) -- ++(1,0) node[right] {oup};
\draw[very thick, ->, hsr-lakegreen] (G.east) -- ++(.5,0) |- (Z.east);
\draw[very thick, ->] (Z.west) -- ++(-.5,0) |- ($(G.west) - (0,.25)$);
\draw[very thick, ->] (G.west) ++ (-.5,-.25) |- ($(F.west) + (0,.25)$);
\draw[very thick, ->, hsr-mauve] ($(G.west) + (-1.5,.25)$)
node[left] {inp} -- ++(1.5,0);
\draw[very thick, ->, hsr-mauve] ($(G.west) + (-1,.25)$) |- ($(F.west) - (0,.25)$);
\end{scope}
% moore
\begin{scope}[yshift = -42mm]
\node[box] (G) {\large G};
\node[box, above = of G] (F) {\large F};
\node[box, below = of G] (Z) {\large Z};
\node[above = of F] {\large Moore};
\draw[very thick, ->, hsr-blue] (F.east) -- ++(1,0) node[right] {oup};
\draw[very thick, ->, hsr-lakegreen] (G.east) -- ++(.5,0) |- (Z.east);
\draw[very thick, ->] (Z.west) -- ++(-.5,0) |- ($(G.west) - (0,.25)$);
\draw[very thick, ->] (G.west) ++ (-.5,-.25) |- (F.west);
\draw[very thick, ->, hsr-mauve] ($(G.west) + (-1.5,.25)$)
node[left] {inp} -- ++(1.5,0);
\end{scope}
% Medwedjew
\begin{scope}[yshift = -80mm]
\node[box] (G) {\large G};
\node[box, below = of G] (Z) {\large Z};
\node[above = of G, yshift = 3mm] {\large Medwedjew};
\draw[very thick, ->, hsr-lakegreen] (G.east) -- ++(.5,0) |- (Z.east);
\draw[very thick, ->, hsr-blue] (Z.west) -- ++(-.5,0) |- ($(G.west) - (0,.25)$);
\draw[very thick, ->, hsr-blue] (G.west) ++ (-.5,-.25) |- ($(G.east) + (1,.75)$)
node[right] {oup};
\draw[very thick, ->, hsr-mauve] ($(G.west) + (-1.5,.25)$)
node[left] {inp} -- ++(1.5,0);
\end{scope}
\end{tikzpicture}
\end{center}
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