78 lines
2.4 KiB
TeX
78 lines
2.4 KiB
TeX
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\subsubsection{Description}
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Most common arithmetic operators can be instantiated without the \verb-Inst- constructor.
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\subsubsection{List}
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Arithmetical operators are listed below :
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\begin{itemize}
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\item \verb-Addition- : \verb-q <= i0 + i1-
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\item \verb-Substraction- : \verb-q <= i0- - \verb-i1-
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\item \verb-Multiplication- : \verb-q <= i0 * i1-
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\item \verb-Division- : \verb-q <= i0 / i1-
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\end{itemize}
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\subsubsection{Generators to instantiate}
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One can choose the generator to be used. Some methods are applied to the cell and set the generator used when using overloard.
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\indent Methods are :
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\begin{itemize}
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\item \verb-SetAdd- (for addition and substraction)
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\item \verb-SetMult-
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\item \verb-SetDiv-
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\end{itemize}
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\indent The generators used by default are :
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\begin{itemize}
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\item \verb-Addition- : Slansky adder
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\item \verb-Substraction- : Slansky adder + inversor + cin = '1'
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\item \verb-Multiplication- : CA2 multiplier (signed, modified booth/Wallace tree)
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\item \verb-Division- : not available yet
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\end{itemize}
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\subsubsection{Example}
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\begin{verbatim}
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class essai ( Model ) :
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def Interface ( self ) :
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self.A = SignalIn ( "a", 4 )
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self.B = SignalIn ( "b", 4 )
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self.S = SignalOut ( "s", 4 )
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self.T = SignalOut ( "t", 8 )
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self.vdd = VddIn ( "vdd" )
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self.vss = VssIn ( "vss" )
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def Netlist ( self ) :
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self.S <= self.A + self.B
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self.T <= self.A * self.B
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\end{verbatim}
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\subsubsection{Errors}
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Some errors may occur :
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\begin{itemize}
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\item \verb-[Stratus ERROR] + : the nets must have the same lenght.-\\When one uses arithmetic expressions, one has to check that the sizes of both nets are equivalent.
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\item \verb-[Stratus ERROR] : there is no alim.-\\The cell being created does not have the alimentation nets. The instanciation is impossible.
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\end{itemize}
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\begin{htmlonly}
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\subsubsection{See Also}
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\hyperref[ref]{\emph{Introduction}}{}{Introduction}{secintroduction}
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\hyperref[ref]{\emph{Netlist}}{}{Netlist}{secnetlist}
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\hyperref[ref]{\emph{Instanciation of a multiplexor}}{}{Multiplexor}{secmux}
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\hyperref[ref]{\emph{Instanciation of a shifter}}{}{Shifter}{secshift}
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\hyperref[ref]{\emph{Instanciation of a register}}{}{Reg}{secreg}
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\hyperref[ref]{\emph{Instanciation of constants}}{}{Constant}{secconstant}
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\hyperref[ref]{\emph{Boolean operations}}{}{Boolean}{secbool}
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\hyperref[ref]{\emph{Comparison operations}}{}{Comparison}{seccomp}
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\end{htmlonly}
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