bus.tex

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{positioning}
\begin{document}
\begin{tikzpicture}[auto]
 \node [circle,fill=red] (pl) {pipeline};
 \node [above right=of pl,rectangle,fill=cyan] (ic) {icache};
 \node [below right=of pl,rectangle,fill=cyan] (dc) {dcache};
 \node [rectangle,fill=cyan,minimum height=5cm] at (5,0) (ab) {Arbie};
 \node at (7,3) (ub) {};
 \node at (7,0) (cb) {};
 \node at (7,-3) (db) {};
 \node at (7,-6) (ddb) {};
 \node [right=of db,rectangle,fill=red] (sc) {SdramCtl};
 \node at (10,3) (rub) {};
 \node at (10,0) (rcb) {};
 \node at (10,-3) (rdb) {};
 \node [right=of rcb,rectangle,fill=red] (usb) {USB?};
 \node [above=of usb,rectangle,fill=red] (uart) {Uart};
 \node [below=of usb,rectangle,fill=red] (vga) {VGA?};
 \node [left=of vga] (vgab) {};
 \node [left=of uart] (uartb) {};
 \draw [<->] (pl) -- (ic);
 \draw [<->] (pl) -- (dc);
 \draw [<->] (ab) -- (ic);
 \draw [<->] (ab) -- (dc);
 \draw [<->] (ab) -- (cb);
 \draw [<->] (cb) -- (rcb);
 \draw [<->] (usb) -- (rcb);
 \draw [<->] (vga) -- (vgab);
 \draw [<->] (uart) -- (uartb);
 \draw [-] (ub) -- (ddb);
 \draw [-] (rub) -- (rdb);
 \draw [<->] (db) -- (sc);
\end{tikzpicture}


\end{document}