--- /dev/null
+
+\section{Yosys by example -- Synthesis}
+
+\begin{frame}
+\sectionpage
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\subsection{Typical Phases of a Synthesis Flow}
+
+\begin{frame}{\subsecname}
+TBD
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\subsection{Design elaboration}
+
+\begin{frame}{\subsecname}
+TBD
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\subsection{High-Level Synthesis}
+
+\begin{frame}{\subsecname}
+TBD
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\subsection{The ``proc'' commands}
+
+\begin{frame}{\subsecname}
+TBD
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\subsection{The ``memory'' commands}
+
+\begin{frame}{\subsecname}
+TBD
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\subsection{The ``fsm'' commands}
+
+\begin{frame}{\subsecname}
+TBD
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\subsection{Low-Level Synthesis}
+
+\begin{frame}{\subsecname}
+TBD
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\subsection{The ``techmap'' command}
+
+\begin{frame}{\subsecname}
+TBD
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\subsection{The ``abc'' command}
+
+\begin{frame}{\subsecname}
+TBD
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\subsection{Other special-purpose mapping commands}
+
+\begin{frame}{\subsecname}
+TBD
+\end{frame}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
\subsection{Verification}
-\begin{frame}{\subsecname{} -- VlogHammer}
-TBD
+\begin{frame}{\subsecname}
+Contiously checking the correctness of Yosys and making sure that new features
+do not break old ones is a high priority in Yosys.
+
+\bigskip
+There are two external test suites build for Yosys: VlogHammer and yosys-bigsim
+(see next slides)
+
+\bigskip
+In addition to that, yosys comes with $\approx\!200$ test cases used in ``{\tt make test}''.
+
+\bigskip
+A debug build of Yosys also contains a lot of asserts and checks the integrity of
+the internal state after each command.
+\end{frame}
+
+\begin{frame}[fragile]{\subsecname{} -- VlogHammer}
+VlogHammer is a Verilog regression test suite developed to test the different
+subsystems in Yosys by comparing them to each other and the implementations
+generated by some proprietary tools (Xilinx Vivado, Xilinx XST, Altera Quartus II, ...).
+
+\bigskip
+Yosys Subsystems tested: Verilog frontend, const folding, const eval, technology mapping,
+simulation models, SAT models.
+
+\bigskip
+Thousands of auto-generated test cases containing code such as:
+\begin{lstlisting}[xleftmargin=1cm, basicstyle=\ttfamily\fontsize{8pt}{10pt}\selectfont, language=Verilog]
+assign y9 = $signed(((+$signed((^(6'd2 ** a2))))<$unsigned($unsigned(((+a3))))));
+assign y10 = (-((+((+{2{(~^p13)}})))^~(!{{b5,b1,a0},(a1&p12),(a4+a3)})));
+assign y11 = (~&(-{(-3'sd3),($unsigned($signed($unsigned({p0,b4,b1}))))}));
+\end{lstlisting}
+
+\bigskip
+Some bugs in Yosys where found and fixed thanks to VlogHammer. Over 20 bugs in
+the proprietary tools used as external reference where found and reported.
\end{frame}
\begin{frame}{\subsecname{} -- yosys-bigsim}
-TBD
+yosys-bigsim is a collection of real-world open-source Verilog designs and test
+benches. yosys-bigsim compares the testbench outpus of simulations of the original
+Verilog code and synthesis results.
+
+\bigskip
+The following designs are part of yosys-bigsim:
+\begin{itemize}
+\item {\tt openmsp430} -- an MSP430 compatible 16 bit CPU
+\item {\tt aes\_5cycle\_2stage} -- an AES encryption core
+\item {\tt softusb\_navre} -- an AVR compatible 8 bit CPU
+\item {\tt amber23} -- an ARMv2 compatible 32 bit CPU
+\item {\tt lm32} -- another 32 bit CPU from Lattice Semiconductor
+\item {\tt verilog-pong} -- a hardware pong game with VGA output
+\item {\tt elliptic\_curve\_group} -- ECG point-add and point-scalar-mul core
+\item {\tt reed\_solomon\_decoder} -- a Reed-Solomon Error Correction Decoder
+\end{itemize}
\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
\subsection{Benefits of Open Source HDL Synthesis}
-\begin{frame}{\subsecname}
-TBD
+\begin{frame}{\subsecname{} -- 1/3}
+\begin{itemize}
+\item Cost (also applies to ``free as in free beer'' solutions): \smallskip\par
+Today the cost for a mask set in $\unit[180]{nm}$ technology is far less than
+the cost for the design tools needed to design the mask layouts. Open Source
+ASIC flows are an important enabler for ASIC-level Open Source Hardware.
+
+\bigskip
+\item Availablity and Reproducability: \smallskip\par
+If you are a researcher who is publishing, you want to use tools that everyone
+else can also use. Even if most universities have access to all major
+commercial tools, you usually do not have easy access to the version that was
+used in a research project a couple of years ago. With Open Source tools you
+can even release the source code of the tool you have used alongside your data.
+\end{itemize}
+\end{frame}
+
+\begin{frame}{\subsecname{} -- 2/3}
+\begin{itemize}
+\item Framework: \smallskip\par
+Yosys is not only a tool. It is a framework that can be used as basis for other
+developments, so researchers and hackers alike do not need to re-invent the
+basic functionality. Extensibility was one of Yosys' design goals.
+
+\bigskip
+\item All-in-one: \smallskip\par
+Because of the framework characterisitcs of Yosys, an increasing number of features
+become available in one tool. Yosys not only can be used for circuit synthesis but
+also for formal equivialence checking, SAT solving, and for circuit analysis, to
+name just a few other application domains. With propritaery software one needs to
+learn a new tool for each of this applications.
+\end{itemize}
+\end{frame}
+
+\begin{frame}{\subsecname{} -- 3/3}
+\begin{itemize}
+\item Educational Tool: \smallskip\par
+Propritaery synthesis tools are at times where secretive about their inner
+workings. They often are ``black boxes'' where a design goes in and synthesis
+results come out. Yosys is very open about its internals and it is easy to
+observe the different steps of synthesis.
+\end{itemize}
+
+\bigskip
+\begin{block}{BTW: Yosys is licensed under the ISC license:}
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+\end{block}
\end{frame}
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