\documentclass{article}
\usepackage[pdftex,active,tightpage]{preview}
\setlength\PreviewBorder{2mm}

\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{shapes, calc, shapes, arrows, snakes}
\newcommand{\width}{0.2}
\begin{document}
\begin{preview}
\tikzstyle{input}=[draw,fill=red!50]
\tikzstyle{conv}=[draw,fill=black!20]
\tikzstyle{max}=[draw,dashed,fill=black!10]
\tikzstyle{dropout}=[draw,dashed,fill=blue!10]
\tikzstyle{fc}=[draw,fill=green!10]
\tikzstyle{output}=[draw,fill=red!50]
\def \coldist {2.5}
\def \widthb {2}

\tikzstyle{stateTransition}=[->, very thick]

\begin{tikzpicture}[scale=2]
    \draw[->, line width=5pt]
        (1.0+0*\coldist, 0.5) --(1.0+0*\coldist, -2.2) --(2.1+0*\coldist, -2.2) --(2.5+0*\coldist, 0.5)
     -- (1.0+1*\coldist, 0.5) --(1.0+1*\coldist, -2.2) --(2.1+1*\coldist, -2.2) --(2.5+1*\coldist, 0.5)
     -- (1.0+2*\coldist, 0.5) --(1.0+2*\coldist, -2.9) --(2.1+2*\coldist, -2.9) --(2.5+2*\coldist, 0.5)
     -- (1.0+3*\coldist, 0.5) --(1.0+3*\coldist, -2.9) --(2.1+3*\coldist, -2.9) --(2.5+3*\coldist, 0.5)
     -- (1.0+4*\coldist, 0.5) --(1.0+4*\coldist, -2.9) --(2.1+4*\coldist, -2.9) --(2.5+4*\coldist, 0.5)
     -- (1.0+5*\coldist, 0.5) --(1.0+5*\coldist, -4.5);
    % \draw[->, line width=5pt] (6.5, -2.8)
    %                        -- (1.0, -2.8) -- (1.0, -6.5) -- (2.0, -6.5) -- (3.0, -3.0)
    %                        -- (4.0, -3.0) -- (4.0, -6.5) -- (5.0, -6.5) -- (6.0, -3.0)
    %                        -- (7.0, -3.0) -- (7.0, -7.0);

    \draw[draw=none] (0*\coldist,-0.5) rectangle (1.0,-0.7) node[pos=.5] {$224 \times 224$};
    \draw[input]     (0*\coldist, 0.0) rectangle (2.0,-0.5) node[pos=.5] {Input};
    \draw[conv]      (0*\coldist,-0.7) rectangle (2.0,-1.2) node[pos=.5] {C $64@3 \times 3 / 1$};
    \draw[conv]      (0*\coldist,-1.4) rectangle (2.0,-1.9) node[pos=.5] {C $64@3 \times 3 / 1$};

    \draw[draw=none] (1*\coldist,-0.5) rectangle (1*\coldist+\widthb/2,-0.7) node[pos=.5] {$112 \times 112$};
    \draw[max]       (1*\coldist, 0.0) rectangle (1*\coldist+\widthb,-0.5) node[pos=.5] {max pooling $2\times 2 / 1$};
    \draw[conv]      (1*\coldist,-0.7) rectangle (1*\coldist+\widthb,-1.2) node[pos=.5] {C $128@3 \times 3 / 1$};
    \draw[conv]      (1*\coldist,-1.4) rectangle (1*\coldist+\widthb,-1.9) node[pos=.5] {C $128@3 \times 3 / 1$};

    \draw[draw=none] (2*\coldist,-0.5) rectangle (2*\coldist+\widthb/2,-0.7) node[pos=.5] {$56 \times 56$};
    \draw[max]       (2*\coldist, 0.0) rectangle (2*\coldist+\widthb,-0.5) node[pos=.5] {max pooling $2\times 2 / 1$};
    \draw[conv]      (2*\coldist,-0.7) rectangle (2*\coldist+\widthb,-1.2) node[pos=.5] {C $256@3 \times 3 / 1$};
    \draw[conv]      (2*\coldist,-1.4) rectangle (2*\coldist+\widthb,-1.9) node[pos=.5] {C $256@3 \times 3 / 1$};
    \draw[conv]      (2*\coldist,-2.1) rectangle (2*\coldist+\widthb,-2.6) node[pos=.5] {C $256@3 \times 3 / 1$};

    % second line
    \draw[draw=none] (3*\coldist,-0.5) rectangle (3*\coldist+\widthb/2,-0.7) node[pos=.5] {$28 \times 28$};
    \draw[max]       (3*\coldist,-0.0) rectangle (3*\coldist+\widthb,-0.5) node[pos=.5] {max pooling $2\times 2 / 1$};
    \draw[conv]      (3*\coldist,-0.7) rectangle (3*\coldist+\widthb,-1.2) node[pos=.5] {C $512@3 \times 3 / 1$};
    \draw[conv]      (3*\coldist,-1.4) rectangle (3*\coldist+\widthb,-1.9) node[pos=.5] {C $512@3 \times 3 / 1$};
    \draw[conv]      (3*\coldist,-2.1) rectangle (3*\coldist+\widthb,-2.6) node[pos=.5] {C $512@3 \times 3 / 1$};

    \draw[draw=none] (4*\coldist,-0.5) rectangle (4*\coldist+\widthb/2,-0.7) node[pos=.5] {$14 \times 14$};
    \draw[max]       (4*\coldist,-0.0) rectangle (4*\coldist+\widthb,-0.5) node[pos=.5] {max pooling $2\times 2 / 1$};
    \draw[conv]      (4*\coldist,-0.7) rectangle (4*\coldist+\widthb,-1.2) node[pos=.5] {C $512@3 \times 3 / 1$};
    \draw[conv]      (4*\coldist,-1.4) rectangle (4*\coldist+\widthb,-1.9) node[pos=.5] {C $512@3 \times 3 / 1$};
    \draw[conv]      (4*\coldist,-2.1) rectangle (4*\coldist+\widthb,-2.6) node[pos=.5] {C $512@3 \times 3 / 1$};

    \draw[draw=none] (5*\coldist,-0.5) rectangle (5*\coldist+\widthb/2,-0.7) node[pos=.5] {$7 \times 7$};
    \draw[max]       (5*\coldist,-0.0) rectangle (5*\coldist+\widthb,-0.5) node[pos=.5] {max pooling $2\times 2 / 1$};
    \draw[fc]        (5*\coldist,-0.7) rectangle (5*\coldist+\widthb,-1.2) node[pos=.5] {Fully Connected 4096};
    \draw[dropout]   (5*\coldist,-1.4) rectangle (5*\coldist+\widthb,-1.9) node[pos=.5] {Dropout $0.5$};
    \draw[fc]        (5*\coldist,-2.1) rectangle (5*\coldist+\widthb,-2.6) node[pos=.5] {Fully Connected 4096};
    \draw[dropout]   (5*\coldist,-2.8) rectangle (5*\coldist+\widthb,-3.3) node[pos=.5] {Dropout $0.5$};
    \draw[output]    (5*\coldist,-3.5) rectangle (5*\coldist+\widthb,-4.0) node[pos=.5] {Fully Connected 1000};
\end{tikzpicture}
\end{preview}
\end{document}