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%
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% Define author(s) and component's name
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%
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\def\defauthor{Lasse Lehtonen}
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\def\deftitle{FH Crossbar\\Reference Manual}
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\author{\defauthor}
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\title{\deftitle}
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\usepackage{fancyhdr}
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\pagestyle{fancy}
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\lhead{\bfseries Department of Computer Systems\\
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Faculty of Computing and Electrical Engineering}
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\chead{}
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\rhead{\bfseries \deftitle}
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\lfoot{\thepage}
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\rfoot{\includegraphics[height=1.0cm]{pic/tty_logo.png}}
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\begin{document}
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%\maketitle
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%\thispagestyle{empty}
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\begin{titlepage}
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\begin{center}
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\vspace{6.0cm}
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\textsc{\LARGE Tampere University of Technology}\\[1.0cm]
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\textsc{\Large Faculty of Computing and Electrical Engineering}\\[1.0cm]
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\textsc{\Large Department of Computer Systems}\\[1.0cm]
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\vspace{6.0cm}
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\hrule
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\vspace{0.4cm}
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{ \huge \bfseries FH Crossbar\\[0.5cm]Reference Manual}
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\vspace{0.4cm}
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\hrule
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%\vspace{2.0cm}
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\vfill
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\begin{minipage}{0.4\textwidth}
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\begin{flushleft} \large
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\emph{Author:}\\
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Lasse Lehtonen
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\end{flushleft}
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\end{minipage}
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\begin{minipage}{0.4\textwidth}
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\begin{flushright} \large
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\emph{Updated:} \\
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\today
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\end{flushright}
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\end{minipage}
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\end{center}
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\end{titlepage}
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\newpage
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\tableofcontents
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\newpage
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\section{REVISION HISTORY}
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\setcounter{page}{1}
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\begin{center}
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\rowcolors{3}{\deftablecolora}{\deftablecolorb}
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\captionof{table}{}
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\begin{tabularx}{\textwidth}{|lllX|}
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\hline
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Revision & Author & Date & Description\\
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\hline
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1.00 & Lasse Lehtonen & 22.8.2011 & Initial documentation\\
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& & & \\
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& & & \\
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& & & \\
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& & & \\
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\hline
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\end{tabularx}
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\end{center}
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\newpage
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\section{DOCUMENT OVERVIEW}
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\subsection{SCOPE}
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This documentation describes the basic operation and usage of FH Crossbar
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Network-on-Chip component.
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\subsection{AUDIENCE}
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For hardware integrators wanting to use this component.
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\subsection{RELATED DOCUMENTATION}
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\begin{center}
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\rowcolors[]{2}{\deftablecolora}{\deftablecolorb}
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\captionof{table}{}
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\begin{tabularx}{\textwidth}{|lX|}
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\hline
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Document & Description\\
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\hline
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& \\
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& \\
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& \\
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& \\
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\hline
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\end{tabularx}
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\end{center}
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\subsection{DOCUMENT CONVENTIONS}
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\begin{itemize}
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\item Ports: \texttt{teletype} in text
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\item Generics: \texttt{teletype} in text
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\end{itemize}
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\newpage
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\section{INTRODUCTION}
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\subsection{BRIEF DESCRIPTION}
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FH Crossbar Network-on-Chip is a highly configurable network. Network can
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be configured to use either store-and-forward of wormhole switching and
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either packet or circuit switching. Fifo depths and bus widths can be
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freely set and the network supports different synchronous frequencies
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for agents than the network's operating frequency.
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\subsection{EXAMPLE SYSTEM}
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Example system in figure~\ref{fig:example_system} presents a four
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agent FH Crossbar.
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\begin{center}
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\includegraphics[width=0.8\textwidth]{pic/example_system.png}
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\captionof{figure}{}
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\label{fig:example_system}
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\end{center}
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\newpage
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\section{HARDWARE DESIGN}
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\subsection{FH CROSSBAR}
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\subsubsection{GENERICS}
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\begin{center}
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\rowcolors{3}{\deftablecolora}{\deftablecolorb}
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\captionof{table}{}
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\begin{tabularx}{\textwidth}{|lX|}
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\hline
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Name & Description\\
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\hline
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pkt\_switch\_en\_g & Packet (1) or circuit (0) switched\\
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n\_ag\_g & Number of agents NoC connects\\
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stfwd\_en\_g & Selects between store-and-forward (1)
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and wormhole (0) switching\\
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data\_width\_g & Width of the data bus in bits\\
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addr\_width\_g & Width of the address bus in bits. Must be less
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or equal than data\_width\_g\\
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fifo\_depth\_g & Depth of FIFOs in words\\
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packet\_length\_g & Maximum packet size in words\\
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timeout\_g & How long to wait for packet to fill\\
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lut\_en\_g & Enable memory mapped address translation\\
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len\_flit\_en\_g & Enable packet to carry length information in
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its own flit\\
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fill\_packet\_g & Only send full packets\\
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oaddr\_flit\_en\_g & Enable packet to carry the destination
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memory-mapped address\\
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max\_send\_g & Max continuos send in the crossbar\\
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net\_freq\_g & Network's frequency relative to IP frequecy\\
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ip\_freq\_g & Agent's relative frequency to network frequecy\\
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\hline
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\end{tabularx}
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\end{center}
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\subsubsection{CLOCKING AND RESET}
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\begin{center}
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\rowcolors{3}{\deftablecolora}{\deftablecolorb}
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\captionof{table}{}
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\begin{tabularx}{\textwidth}{|lllX|}
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\hline
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Port & Width & Direction & Description\\
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\hline
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clk\_net & 1 & in & Clock for the network, active on rising edge\\
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clk\_ip & 1 & in & Clock for the IP, active on rising edge\\
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rst\_n & 1 & in & Reset, asynchronous, active low\\
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\hline
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\end{tabularx}
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\end{center}
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Clock frequencies must be at integer ratio (e.g. 1:3 but not 2:3) and they must
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have a synchronized rising edge.
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\subsubsection{DATA INTERFACE}
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\begin{center}
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\rowcolors{3}{\deftablecolora}{\deftablecolorb}
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\captionof{table}{}
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\begin{tabularx}{\textwidth}{|lllX|}
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\hline
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Port & Width & Direction & Description\\
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\hline
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tx\_data\_in & n\_ag\_g*data\_width\_g & in & All TX datas from IPs \\
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tx\_we\_in & n\_ag\_g & in & Write enables from all IPs\\
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tx\_re\_in & n\_ag\_g & in & Read enables from all IPs\\
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rx\_data\_out & n\_ag\_g*data\_width\_g & out & All RX datas from the network\\
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rx\_empty\_out & n\_ag\_g & out & RX FIFO empty signals\\
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rx\_full\_out & n\_ag\_g & out & RX FIFO full signals\\
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tx\_empty\_out & n\_ag\_g & out & TX FIFO empty signals\\
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tx\_full\_out & n\_ag\_g & out & TX FIFO full signals\\
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\hline
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\end{tabularx}
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\end{center}
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Routers are connected to vectors starting from 0 and continuing to
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$n\_ag\_g-1$.
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\subsubsection{ARCHITECTURE}
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Packet Codec is instantiated between the FH Crossbar and agents to
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enable additional features such as clock domain crossing and address
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translation from memory mapped io addresses to the network address.
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\begin{center}
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\includegraphics[width=0.4\textwidth]{pic/architecture.png}
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\captionof{figure}{}
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\end{center}
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\subsubsection{INTEGRATION}
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Related source files are listed in next table in the order of
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compilation (when applicable).
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\begin{center}
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\rowcolors{3}{\deftablecolora}{\deftablecolorb}
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\captionof{table}{}
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\label{tab:files}
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\begin{tabularx}{\textwidth}{|lX|}
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\hline
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Filename & Description\\
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\hline
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fifo.vhd & Simple synchronous FIFO\\
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multiclk\_fifo.vhd & FIFO with clock domain crossing\\
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pkt\_counter.vhd & Debug component counting packets\\
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addr\_lut\_pkg.vhd & Package for pkt\_codec\\
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addr\_lut.vhd & Address translation unit\\
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pkt\_enc.vhd & Packet encoder\\
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pkt\_dec.vhd & Pakcet decoder\\
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pkt\_enc\_dec\_1d & Top level for encoders and decoders\\
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allocator.vhd & Allocates connections\\
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arbiter.vhd & Arbiter\\
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io\_block.vhd & Contains FIFOSs\\
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switch\_matrix.vhd & Switching element\\
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crossbar.vhd & Top level for FH Crossbar\\
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crossbar\_with\_pkt\_codec\_top.vhd & Top level with Packet Codecs\\
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\hline
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\end{tabularx}
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\end{center}
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\subsubsection{SWITCHING}
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Depending on generic \texttt{stfwd\_en\_g} FH Crossbar uses either
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store-and-forward or wormhole switching. If store-and-forward
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switching is used the Packet Codec handles the creation of the network
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packet. If there's not enough data to fill the whole packet the unused
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flits will be sent empty. Packet Codec will wait few clock cycles
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before filling the packet to allow IP to stall a little while
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sending. For store-and-forward switching the FIFOs must be the same
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size as the packets. If circuit-switched mode is used Packet Codec is
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not instantiated.
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\vspace{0.4cm}
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\noindent
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For wormhole switched configuration there's no limitation to the size
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of the FIFOs.
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\newpage
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\section{TESTING}
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\subsection{TEST CASE}
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FH Crossbar network model comes with a simple test case which instantiates
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a six agent crossbar with packet codec inteface. Test case sends one message
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from agent 0 to agent 5 and terminates after that.
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\subsection{SIMULATION}
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In order to simulate the test case one needs to compile files listed
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in table~\ref{tab:files} in addition to files listed in
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table~\ref{tab:simfiles} found in basic\_tester/vhd. Top level for the
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simulation (simple\_test\_crossbar.vhd) and the test case files are
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located in directory crossbar/sim. For the users of Modelsim also a
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|
|
do-file to compile needed files is supplied.
|
| 358 |
|
|
|
| 359 |
|
|
|
| 360 |
|
|
\begin{center}
|
| 361 |
|
|
\rowcolors{3}{\deftablecolora}{\deftablecolorb}
|
| 362 |
|
|
|
| 363 |
|
|
\captionof{table}{}
|
| 364 |
|
|
\label{tab:simfiles}
|
| 365 |
|
|
\begin{tabularx}{\textwidth}{|lX|}
|
| 366 |
|
|
\hline
|
| 367 |
|
|
Filename & Description\\
|
| 368 |
|
|
\hline
|
| 369 |
|
|
txt\_util.vhd & Helper functions for printing\\
|
| 370 |
|
|
basic\_tester\_pkg.vhd & Package for Basic Tester\\
|
| 371 |
|
|
basic\_tester\_tx.vhd & Transfer generation\\
|
| 372 |
|
|
basic\_tester\_rx.vhd & Transfer validator\\
|
| 373 |
|
|
\hline
|
| 374 |
|
|
\end{tabularx}
|
| 375 |
|
|
\end{center}
|
| 376 |
|
|
|
| 377 |
|
|
|
| 378 |
|
|
\end{document}
|
