<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">\begin{itemize}
    \item Name : DpgenAdsb2f -- Adder/Substractor Macro-Generator
    \item Description : Generates a \verb-n- bits adder/substractor named \verb-modelname-.
    \item How it works :
    \begin{itemize}
        \item if the \verb-add_sub- signal is set to \verb-zero- an addition is performed, otherwise it's a substraction.
        \item Operation can be either signed or unsigned. In unsigned mode \verb-c31- is the overflow. in signed mode you have to compute overflow by \emph{XORing} \verb-c31- and \verb-c30-
    \end{itemize}
    \item Terminal Names :
    \begin{itemize}
        \item add\_sub : select addition or substraction (input, 1 bit)
        \item c31 : carry out. In unsigned mode, this is the overflow (output, 1 bit)
        \item c30 : used to compute overflow in signed mode : \verb-overflow = c31 xor c30- (output, 1 bit)
        \item i0 : first operand (input, \verb-n- bits)
        \item i1 : second operand (input, \verb-n- bits)
        \item q : output (\verb-n- bits)
        \item vdd : power
        \item vss : ground
    \end{itemize}
    \item Parameters : Parameters are given with a map called \verb-param-.
    \begin{itemize}
        \item nbit : Defines the size of the generator
    \end{itemize}
%    \item Behavior :
%\begin{verbatim}
%\end{verbatim}
    \item Example :
\begin{verbatim}
class myClass ( Model ) :
  def Interface ( self ) :
    self._in    = LogicIn  (  "in", 8 )
    self._in2   = LogicIn  ( "in2", 8 )
    
    self._out   = LogicOut ( "out", 8 )

    self._as    = LogicIn  (  "as", 1 )
    self._c0    = LogicOut (  "c0", 1 )
    self._c1    = LogicOut (  "c1", 1 )
    
    self._vdd   = VddIn    ( "vdd" )
    self._vss   = VssIn    ( "vss" )
    
  def Netlist ( self ) :
      
    Inst ( 'DpgenAdsb2f'
         , param = { 'nbit' : 8 }
         , map  = { 'i0'      : self._in
                  , 'i1'      : self._in2
                  , 'add_sub' : self._as
                  , 'q'       : self._out
                  , 'c30'     : self._c0
                  , 'c31'     : self._c1
                  , 'vdd'     : self._vdd
                  , 'vss'     : self._vss
                  }
         )
\end{verbatim}
\end{itemize}
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