yosys/docs/source/_images/internals/verilog_flow.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{process} = [draw, fill=green!10, rectangle, minimum height=3em, minimum width=10em, node distance=5em, font={\ttfamily}]
\tikzstyle{data} = [draw, fill=blue!10, ellipse, minimum height=3em, minimum width=7em, node distance=5em, font={\ttfamily}]
\node[data] (n1) {Verilog Source};
\node[process] (n2) [below of=n1] {Verilog Frontend};
\node[data] (n3) [below of=n2] {AST};
\node[process] (n4) [below of=n3] {AST Frontend};
\node[data] (n5) [below of=n4] {RTLIL};
\draw[-latex] (n1) -- (n2);
\draw[-latex] (n2) -- (n3);
\draw[-latex] (n3) -- (n4);
\draw[-latex] (n4) -- (n5);
\tikzstyle{details} = [draw, fill=yellow!5, rectangle, node distance=6cm, font={\ttfamily}]
\node[details] (d1) [right of=n2] {\begin{minipage}{5cm}
\hfil
\begin{tikzpicture}
\tikzstyle{subproc} = [draw, fill=green!10, rectangle, minimum height=2em, minimum width=10em, node distance=3em, font={\ttfamily}]
\node (s0) {};
\node[subproc] (s1) [below of=s0] {Preprocessor};
\node[subproc] (s2) [below of=s1] {Lexer};
\node[subproc] (s3) [below of=s2] {Parser};
\node[node distance=3em] (s4) [below of=s3] {};
\draw[-latex] (s0) -- (s1);
\draw[-latex] (s1) -- (s2);
\draw[-latex] (s2) -- (s3);
\draw[-latex] (s3) -- (s4);
\end{tikzpicture}
\end{minipage}};
\draw[dashed] (n2.north east) -- (d1.north west);
\draw[dashed] (n2.south east) -- (d1.south west);
\node[details] (d2) [right of=n4] {\begin{minipage}{5cm}
\hfil
\begin{tikzpicture}
\tikzstyle{subproc} = [draw, fill=green!10, rectangle, minimum height=2em, minimum width=10em, node distance=3em, font={\ttfamily}]
\node (s0) {};
\node[subproc] (s1) [below of=s0] {Simplifier};
\node[subproc] (s2) [below of=s1] {RTLIL Generator};
\node[node distance=3em] (s3) [below of=s2] {};
\draw[-latex] (s0) -- (s1);
\draw[-latex] (s1) -- (s2);
\draw[-latex] (s2) -- (s3);
\end{tikzpicture}
\end{minipage}};
\draw[dashed] (n4.north east) -- (d2.north west);
\draw[dashed] (n4.south east) -- (d2.south west);
\end{tikzpicture}
\end{document}