86 lines
2.5 KiB
TeX
86 lines
2.5 KiB
TeX
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\subsubsection{Name}
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Constant -- Easy way to instantiate constants
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\subsubsection{Synopsys}
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\begin{verbatim}
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netOne <= One ( 2 )
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net8 <= "8"
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\end{verbatim}
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\subsubsection{Description}
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These functions simplify the way to instanciate constants.
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\begin{itemize}
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\item The functions \verb-One- and\verb-Zero- permits to initialise all the bits of a net to 'one' or 'zero'.
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\item The instanciation of a constant thanks to a string can be done in decimal, hecadecimal or binary.
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\end{itemize}
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\subsubsection{Parameters}
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\begin{itemize}
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\item For \verb-One- and \verb-Zero- :
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\begin{itemize}
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\item \verb-n- : the arity of the net
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\end{itemize}
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\item For the instanciation of a constant :
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\begin{itemize}
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\item the constant given must be a string representing :
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\begin{itemize}
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\item A decimal number
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\item A binary number : the string must begin with "0b"
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\item An hexadecimal number : the string must begin with "0x"
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\end{itemize}
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\end{itemize}
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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.Ones = SignalOut ( "ones", 2 )
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self.Zeros = SignalOut ( "zeros", 4 )
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self.Eight = SignalOut ( "eight", 4 )
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self.Twentu = SignalOut ( "twenty", 5 )
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self.Two = SignalOut ( "two", 5 )
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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.Ones <= One ( 2 )
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self.Zero <= Zero ( 4 )
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self.Eight <= "8"
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self.Twenty <= "0x14"
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self.Two <= "0b10"
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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] Const :-\\\verb-the argument must be a string representing a number in decimal,-\\\verb-binary (0b) or hexa (0x).-\\The string given as argument does not have the right form.
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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{Boolean operations}}{}{Boolean}{secbool}
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\hyperref[ref]{\emph{Arithmetical operations}}{}{Arithmetic}{secarithmetic}
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\hyperref[ref]{\emph{Comparison operations}}{}{Comparison}{seccomp}
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\end{htmlonly}
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