\subsubsection{Description}

Most common boolean operators can be instantiated without the \verb-Inst- constructor.

\subsubsection{List}

Boolean operators are listed below :
\begin{itemize}
    \item \verb-And2- : \verb-q <= i0 & i1-
    \item \verb-Or2-  : \verb-q <= i0 | i1-
    \item \verb-Xor2- : \verb-q <= i0 ^ i1-
    \item \verb-Inv-  : \verb-q <= ~i0-
\end{itemize}


\subsubsection{Generators to instantiate}

One can choose the generator to be used. Some methods are applied to the cell and set the generator used when using \verb-&-, \verb-|-, \verb-^- and \verb-~-. The generators used by default are the ones from the virtual library.\\
        
\indent Methods are :
\begin{itemize}
    \item \verb-SetAnd-
    \item \verb-SetOr-
    \item \verb-SetXor-
    \item \verb-SetNot-
\end{itemize}

\subsubsection{Example}

\begin{verbatim}
class essai ( Model ) :

  def Interface ( self ) :
    self.A = SignalIn  ( "a", 4 )
    self.B = SignalIn  ( "b", 4 )
    self.B = SignalIn  ( "c", 4 )
    
    self.S = SignalOut ( "s", 4 )

    self.vdd = VddIn  ( "vdd" )
    self.vss = VssIn  ( "vss" )
	
  def Netlist ( self ) :

    self.S <= ( ~self.A & self.B ) | self.C
\end{verbatim}
  
\subsubsection{Errors}
    
Some errors may occur :
\begin{itemize}
    \item \verb-[Stratus ERROR] & : the nets must have the same lenght.-\\When one uses boolean expressions, one has to check that the sizes of both nets are equivalent.
    \item \verb-[Stratus ERROR] : there is no alim.-\\The cell being created does not have the alimentation nets. The instanciation is impossible.
\end{itemize}

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\subsubsection{See Also}

\hyperref[ref]{\emph{Introduction}}{}{Introduction}{secintroduction}
\hyperref[ref]{\emph{Netlist}}{}{Netlist}{secnetlist}
\hyperref[ref]{\emph{Instanciation of a multiplexor}}{}{Multiplexor}{secmux}
\hyperref[ref]{\emph{Instanciation of a shifter}}{}{Shifter}{secshift}
\hyperref[ref]{\emph{Instanciation of a register}}{}{Reg}{secreg}
\hyperref[ref]{\emph{Instanciation of constants}}{}{Constant}{secconstant}
\hyperref[ref]{\emph{Arithmetical operations}}{}{Arithmetic}{secarithmetic}
\hyperref[ref]{\emph{Comparison operations}}{}{Comparison}{seccomp}

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