\begin{itemize}
    \item \textbf{Name} : DpgenDfft -- Dynamic Flip-Flop with Scan-Path Macro-Generator
    \item \textbf{Synopsys} :
\begin{verbatim}
Generate ( 'DpgenDfft', modelname
         , param = { 'nbit'       : n
                   , 'physical'   : True
                   , 'behavioral' : True         
                   }
         )
\end{verbatim}
    \item \textbf{Description} : Generates a n bits dynamic flip-flop with scan-path named \verb-modelname-. The two latches of this flip-flop are dynamic, i.e. the data is stored in a capacitor.
    \item \textbf{Terminal Names} :
    \begin{itemize}
        \item \textbf{scan} : scan-path mode (input, 1 bit)
        \item \textbf{scin} : scan path in (input, 1 bit)
        \item \textbf{wen} : write enable (1 bit)
        \item \textbf{ck} : clock signal (1 bit)
        \item \textbf{i0} : data input (\verb-n- bits)
        \item \textbf{q} : output (\verb-n- bits)
        \item \textbf{vdd} : power
        \item \textbf{vss} : ground
    \end{itemize}
    \item \textbf{Parameters} : Parameters are given in the map \verb-param-.
    \begin{itemize}
        \item \textbf{nbit} (mandatory) : Defines the size of the generator
        \item \textbf{physical} (optional, default value : False) : In order to generate a layout
        \item \textbf{behavioral} (optional, default value : False) : In order to generate a behavior        
    \end{itemize}
    \item \textbf{How it works} : 
    \begin{itemize}
        \item When scan is set to \verb-one-, it enables the scan-path mode. Note that in scan-path mode, the wen signal is not effective
        \item scin is the input of the scan-path. This terminal is different from \verb-i0[0]-. The scout is q[N-1] (in the following example this is \verb-q[31]-)
        \item When wen is set to \verb-one- enables the writing of the flip-flop
    \end{itemize}    
%    \item \textbf{Behavior} :
%\begin{verbatim}
%\end{verbatim}
    \item \textbf{Example} :
\begin{verbatim}
from stratus import *

class inst_dfft ( Model ) :

  def Interface ( self ) :
    self.scan = SignalIn  ( "scin", 1 )
    self.scin = SignalIn  ( "scan", 1 )
    self.ck   = SignalIn  (   "ck", 1 )
    self.wen  = SignalIn  (  "wen", 1 )
    self.i    = SignalIn  (    "i", 4 )
    self.o    = SignalOut (    "o", 4 )

    self.vdd = VddIn ( "vdd" )
    self.vss = VssIn ( "vss" )
    
  def Netlist ( self ) :
    Generate ( 'DpgenDfft', 'dfft_4'
             , param = { 'nbit' : 4
                       , 'physical' : True
                       }
             )      
    self.I = Inst ( 'dfft_4', 'inst'
                  , map = { "wen"  : self.wen
                          , "ck"   : self.ck
                          , "scan" : self.scan
                          , "scin" : self.scin
                          , "i0"   : self.i
                          ,  "q"   : self.o
                          , 'vdd'  : self.vdd
                          , 'vss'  : self.vss
                          }
                  )
      
  def Layout ( self ) :
    Place ( self.I, NOSYM, Ref(0, 0) )
\end{verbatim}
\end{itemize}