yosys/docs/source/_images/primer/basics_ast.tex

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\documentclass[12pt,tikz]{standalone}
\pdfinfoomitdate 1
\pdfsuppressptexinfo 1
\pdftrailerid{}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{pgfplots}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric}
\pagestyle{empty}
\begin{document}
\begin{tikzpicture}
\tikzstyle{node} = [draw, fill=green!10, ellipse, minimum height=2em, minimum width=8em, node distance=10em]
\draw (+0,+0) node[node] (n1) {\tt ASSIGN};
\draw (-2,-2) node[node] (n11) {\tt ID: foo};
\draw (+2,-2) node[node] (n12) {\tt PLUS};
\draw (+0,-4) node[node] (n121) {\tt ID: bar};
\draw (+4,-4) node[node] (n122) {\tt CONST: 42};
\draw[-latex] (n1) -- (n11);
\draw[-latex] (n1) -- (n12);
\draw[-latex] (n12) -- (n121);
\draw[-latex] (n12) -- (n122);
\end{tikzpicture}
\end{document}