119 lines
3.2 KiB
TeX
119 lines
3.2 KiB
TeX
\subsubsection{Name}
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SignalIn, SignalOut ... -- Creation of nets
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\subsubsection{Synopsys}
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\begin{verbatim}
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netA = SignalIn ( "a", 4 )
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\end{verbatim}
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\subsubsection{Description}
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How to create and use nets.
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\subsubsection{Nets}
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Differents kind of nets are listed below :
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\begin{itemize}
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\item \verb-SignalIn- : Creation of an input port
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\item \verb-SignalOut- : Creation of an output port
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\item \verb-SignalInOut- : Creation of an inout port
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\item \verb-SignalUnknown- : Creation of an input/output port which direction is not defined
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\item \verb-TriState- : Creation of a tristate port
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\item \verb-CkIn- : Creation of a clock port
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\item \verb-VddIn- : Creation of the vdd alimentation
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\item \verb-VssIn- : Creation of the vss alimentation
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\item \verb-Signal- : Creation of an internal net
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\end{itemize}
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\subsubsection{Parameters}
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All kind of constructors have the same parameters :
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\begin{itemize}
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\item \verb-name- : the name of the net (mandatory argument)
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\item \verb-arity- : the arity of the net (mandatory argument)
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\item \verb-indice- : for bit vectors only : the LSB bit (optional argument : set to 0 by default)
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\end{itemize}
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\indent Only \verb-CkIn-, \verb-VddIn- and \verb-VssIn- do not have the same parameters : there is only the \verb-name- parameter (they are 1 bit nets).
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\subsubsection{Functions and methods}
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Some functions/methods are provided in order to handle nets :
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\begin{itemize}
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\item function \verb-Cat- : Concatenation of nets, beginning with the MSB
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\begin{verbatim}
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Inst ( 'DpgenInv'
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, map = { 'i0' : Cat ( A, B )
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, 'nq' : S
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, 'vdd' : vdd
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, 'vss' : vss
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}
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)
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\end{verbatim}
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\indent Or :
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\begin{verbatim}
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tab = []
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tab.append ( A )
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tab.append ( B )
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Inst ( 'DpgenInv'
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, map = { 'i0' : Cat ( tab )
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, 'nq' : S
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, 'vdd' : vdd
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, 'vss' : vss
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}
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)
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\end{verbatim}
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\indent If A and B are 2 bits nets, the net \verb-myNet- will be such as :
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\begin{verbatim}
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myNet[3] = A[1]
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myNet[2] = A[0]
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myNet[1] = B[1]
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myNet[0] = B[0]
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\end{verbatim}
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\item function \verb-Extend- : Creation of a net which is an extension of the net which it is applied to
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\begin{verbatim}
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temp = Signal ( "temp", 5 )
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tempExt = Signal ( "temp_ext", 8 )
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tempExt <= temp.Extand ( 8, 'one' )
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\end{verbatim}
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\item method \verb-Alias- : Creation of an alias name for a net
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\begin{verbatim}
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cin.Alias ( c_temp[0] )
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cout.Alias ( c_temp[4] )
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for i in range ( 4 ) :
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Inst ( "Fulladder"
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, map = { 'a' : a[i]
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, 'b' : b[i]
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, 'cin' : c_temp[i]
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, 'sout' : sout[i]
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, 'cout' : c_temp[i+1]
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, 'vdd' : vdd
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, 'vss' : vss
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}
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)
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\end{verbatim}
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\end{itemize}
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\begin{htmlonly}
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\subsubsection{Example}
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You can see a concrete example at : \hyperref[ref]{\emph{Example}}{}{Example}{secexample}
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\end{htmlonly}
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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-Error in SignalIn :-\\\verb-the lenght of the net must be a positive value.-\\One can not create a net with a negative lenght.
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\end{itemize}
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\begin{htmlonly}
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\input{see_also}
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\end{htmlonly}
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