source: anr/section-4.1.tex @ 13

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1\begin{figure}\leavevmode\center
2\includegraphics[width=.8\linewidth]{architecture-csg}
3\caption{\label{archi-csg} software architecture for embedded system generation}
4%\end{figure}\begin{figure}\leavevmode\center
5\mbox{}\vspace*{1ex}\\
6\includegraphics[width=.8\linewidth]{architecture-hls}
7\caption{\label{archi-hls} software architecture of HLS}
8%\end{figure}\begin{figure}\leavevmode\center
9\mbox{}\vspace*{1ex}\\
10\includegraphics[width=.8\linewidth]{architecture-hpc}
11\caption{\label{archi-hpc} software architecture of HPC}
12\end{figure}
13%
14The figures~\ref{archi-csg}, \ref{archi-hls} and \ref{archi-hpc}
15summarize the software architecture of COACH framework we plan to develop.
16In figures, the dotted boxes are the softwares or formats that COACH
17has to provide or define.
18\vspace*{.75ex}\par
19For the system genration presented figure~\ref{archi-csg}, the conductor is
20the program \verb!CSG! (COACH System Generator). Its inputs are a process
21network and miscellaneaous generation parameters.
22The main parameters are the template of the target hardware architecture
23with its instanciation parameters, the hardware/software mapping of the
24tasks and the FPGA device.
25From these inputs \verb!CSG! can generate the system (software \& hardware) as
26a SystemC simulator to prototype and explore quickly the system design
27space and/or as a bitstream directly downloadable on the FPGA device.
28For processing, \verb+CSG+ requires 1) a hardware template found into the
29architecture library, 2) a micro-kernel, it chooses among
30two in the micro kernel library, 3) the system hardware components that
31are taken from the SystemC model library for the simulator and from the
32VHDL component library for the FPGA bitstream. 
33For generating the coprocessor of a task mapped as harware, \verb+CSG+
34controls the HLS tools described below.
35\\
36To proove CSG that COACH is open and CSG is really configurable, COACH will
37basically support 3 architecture template (the COACH template based on a
38MIPS processors and a VCI token ring, the Altera template based on the NIOS
39and AVALON bus, the Xilinx template based on the MICROBLAZE and OPB bus)
40and 2 operating systems (DNA/OS and MUTEK). Furthermore, thus is enforced
41by the \mustbecompleted{FIXME:zied} contribution that consists in
42implementing an other hardware target.
43\\
44Finally, it is important to notice that this work is a strong
45enhancement of the SocLib software.
46\vspace*{.75ex}\par
47The software architecture for HLS is presented figure~\ref{archi-hls}.
48The input is a task of the process network. The HLS tools do not work
49directly on the C++ task description but on an internal format called
50\xcoach generated by a the GNU C compiler (GCC) tainted by a COACH
51driver. This allows on the one hand to insure that all the tools will
52accept the same C++ description and on the other hand to make possible
53to chain them. The front-end tools read a \xcoach description and writes
54a new \xcoach description that exibits possible parallelism or implement
55specific instruction for ASIP. The back-end tools read a \xcoach
56description and generates a \xcoach+ description that is a \xcoach
57description anotated with hardware information to let work the VHDL systemC
58drivers. Furthermore, the back-end tools uses a macro-cell library.
59\vspace*{.75ex}\par
60The software architecture for HPC is presented figure~\ref{archi-hpc}.
61\mustbecompleted{FIXME Miss HPC description\\\ldots\\\ldots\\\ldots\\\ldots.}
62\vspace*{.75ex}\par
63The project is splitted into 8 tasks numbered from 0 to 7.
64The first task (task 0) is the project management, the last one (task 7) is
65the dissemination the other task are listed below:
66\begin{enumerate}
67\item\textbf{\backbone:} This task groups the critical issues of the
68        project. They consist of the definition of COACH inputs, the \xcoach
69        format that is mandatory to develop the HLS tools and the HLS drivers
70        that are mandatory for testing the HLS tools.
71\item\textbf{system generation:} This task groups \verb+CSG+s and the components
72        required to generate the system simulator and bitstream except the HLS
73        tools that belong to the task 3 and 4. These components are the
74        operating systems, the VHDL description and SystemC models of the
75        target hardware achitectures.
76\item\textbf{HLS front-end:} This task groups the 4 HLS front-head. Those
77        are a tool that exhibits fine grain parallelism using polyedric
78        transformation, a tool that exhibits coarse grain parallelism,
79        a tool that minimizes the memory usage and a tool that implement ASIP.
80\item\textbf{HLS back-end:} This task groups two HLS back-end tool, one
81        for treating the data oriented description, the second for treating the
82        control dominated description. This task contains also a the
83        development of a frequency adaptator that will allow the coprocessor
84        to respect the processor \& bus frequency.
85\item\textbf{Communication software PC/FPGA-SoC:} This task groups all what is mandatorythe critical issues of the
86\item\textbf{Demonstrator:} This task groups the demostrators of the COACH project.
87\end{enumerate}
88This task division offers the avantage that tasks except for the "\backbone" and
89"demonstrator" task are almost independent at the development level as shown
90figure~\ref{dependence-dev}. The dependence at the validation level is
91presented figure~\ref{dependence-test}. It is more critical but the
92redundance in the tasks "HLS front-end", "HLS back-end" and "demonstrators"
93reduces this inter-dependence.\\
94So if the first phasis of "\backbone" task is sucessfully conduced, most of the
95projet delivrables will be carry through, even if some delivrable are lated
96or missing.
97\begin{figure}\leavevmode\center
98\begin{minipage}[t]{.4\linewidth}
99\includegraphics[width=1\linewidth]{dependence-dev}
100\caption{\label{dependence-dev}Dependence graph at development level}
101\end{minipage}\hfill\begin{minipage}[t]{.4\linewidth}
102\includegraphics[width=1\linewidth]{dependence-test}
103\caption{\label{dependence-test}Dependence graph at validation level}
104\end{minipage}
105\end{figure}
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