78 lines
3.0 KiB
TeX
78 lines
3.0 KiB
TeX
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\begin{itemize}
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\item \textbf{Name} : DpgenDfft -- Dynamic Flip-Flop with Scan-Path Macro-Generator
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\item \textbf{Synopsys} :
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\begin{verbatim}
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Generate ( 'DpgenDfft', modelname
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, param = { 'nbit' : n
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, 'physical' : True
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, 'behavioral' : True
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}
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)
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\end{verbatim}
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\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.
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\item \textbf{Terminal Names} :
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\begin{itemize}
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\item \textbf{scan} : scan-path mode (input, 1 bit)
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\item \textbf{scin} : scan path in (input, 1 bit)
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\item \textbf{wen} : write enable (1 bit)
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\item \textbf{ck} : clock signal (1 bit)
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\item \textbf{i0} : data input (\verb-n- bits)
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\item \textbf{q} : output (\verb-n- bits)
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\item \textbf{vdd} : power
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\item \textbf{vss} : ground
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\end{itemize}
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\item \textbf{Parameters} : Parameters are given in the map \verb-param-.
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\begin{itemize}
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\item \textbf{nbit} (mandatory) : Defines the size of the generator
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\item \textbf{physical} (optional, default value : False) : In order to generate a layout
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\item \textbf{behavioral} (optional, default value : False) : In order to generate a behavior
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\end{itemize}
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\item \textbf{How it works} :
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\begin{itemize}
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\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
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\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]-)
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\item When wen is set to \verb-one- enables the writing of the flip-flop
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\end{itemize}
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% \item \textbf{Behavior} :
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%\begin{verbatim}
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%\end{verbatim}
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\item \textbf{Example} :
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\begin{verbatim}
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from stratus import *
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class inst_dfft ( Model ) :
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def Interface ( self ) :
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self.scan = SignalIn ( "scin", 1 )
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self.scin = SignalIn ( "scan", 1 )
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self.ck = SignalIn ( "ck", 1 )
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self.wen = SignalIn ( "wen", 1 )
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self.i = SignalIn ( "i", 4 )
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self.o = SignalOut ( "o", 4 )
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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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Generate ( 'DpgenDfft', 'dfft_4'
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, param = { 'nbit' : 4
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, 'physical' : True
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}
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)
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self.I = Inst ( 'dfft_4', 'inst'
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, map = { "wen" : self.wen
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, "ck" : self.ck
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, "scan" : self.scan
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, "scin" : self.scin
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, "i0" : self.i
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, "q" : self.o
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, 'vdd' : self.vdd
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, 'vss' : self.vss
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}
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)
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def Layout ( self ) :
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Place ( self.I, NOSYM, Ref(0, 0) )
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\end{verbatim}
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\end{itemize}
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