75 lines
3.1 KiB
TeX
75 lines
3.1 KiB
TeX
|
\begin{itemize}
|
||
|
|
\item \textbf{Name} : DpgenNor2mask -- Programmable Mask Macro-Generator
|
||
|
|
\item \textbf{Synopsys} :
|
||
|
|
\begin{verbatim}
|
||
|
|
Generate ( 'DpgenNor2mask', modelname
|
||
|
|
, param = { 'nbit' : n
|
||
|
|
, 'const' : constVal
|
||
|
|
, 'physical' : True
|
||
|
|
, 'behavioral' : True
|
||
|
|
}
|
||
|
|
)
|
||
|
|
\end{verbatim}
|
||
|
|
\item \textbf{Description} : Generates a \verb-n- bits conditionnal NOR mask named \verb-modelname-.
|
||
|
|
\item \textbf{Terminal Names} :
|
||
|
|
\begin{itemize}
|
||
|
|
\item \textbf{cmd} : mask control ( 1 bit )
|
||
|
|
\item \textbf{i0} : input ( \verb-n- bits )
|
||
|
|
\item \textbf{nq} : 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{const} (mandatory) : Defines the constant (string beginning with 0b, 0x or 0o functions of the basis)
|
||
|
|
\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 If the \verb-cmd- signal is set to \verb-zero-, the mask is NOT applied, so the whole operator behaves like an inverter.
|
||
|
|
\item If the \verb-cmd- signal is set to \verb-one-, the mask is applied, the output is the \emph{complemented} result of the input value \emph{ORed} with the mask (suplied by \verb-constVal-).
|
||
|
|
\item The constant \verb-constVal- is given to the macro-generator call, therefore the value cannot be changed afterward : it's hard wired in the operator.
|
||
|
|
\item A common error is to give a real constant for the \verb-constVal- argument. Be aware that it is a character string.
|
||
|
|
\end{itemize}
|
||
|
|
\item \textbf{Behavior} :
|
||
|
|
\begin{verbatim}
|
||
|
|
nq <= WITH cmd SELECT not(i0) WHEN '0',
|
||
|
|
not(i0 or constVal) WHEN '1';
|
||
|
|
\end{verbatim}
|
||
|
|
\item \textbf{Example} :
|
||
|
|
\begin{verbatim}
|
||
|
|
from stratus import *
|
||
|
|
|
||
|
|
class inst_nor2mask ( Model ) :
|
||
|
|
|
||
|
|
def Interface ( self ) :
|
||
|
|
self.i = SignalIn ( "i", 8 )
|
||
|
|
self.cmd = SignalIn ( "cmd", 1 )
|
||
|
|
self.o = SignalOut ( "o", 8 )
|
||
|
|
|
||
|
|
self.vdd = VddIn ( "vdd" )
|
||
|
|
self.vss = VssIn ( "vss" )
|
||
|
|
|
||
|
|
def Netlist ( self ) :
|
||
|
|
Generate ( 'DpgenNor2mask', 'nor2mask_000111'
|
||
|
|
, param = { 'nbit' : 8
|
||
|
|
, 'const' : "0b000111"
|
||
|
|
, 'physical' : True
|
||
|
|
}
|
||
|
|
)
|
||
|
|
self.I = Inst ( 'nor2mask_000111', 'inst'
|
||
|
|
, map = { 'i0' : self.i
|
||
|
|
, 'cmd' : self.cmd
|
||
|
|
, 'nq' : self.o
|
||
|
|
, 'vdd' : self.vdd
|
||
|
|
, 'vss' : self.vss
|
||
|
|
}
|
||
|
|
)
|
||
|
|
|
||
|
|
def Layout ( self ) :
|
||
|
|
Place ( self.I, NOSYM, Ref(0, 0) )
|
||
|
|
\end{verbatim}
|
||
|
|
\end{itemize}
|