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manual: make description of $meminit ports match reality.

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whitequark 2018-12-21 01:26:08 +00:00
parent c04908c997
commit 182d84ad54
1 changed files with 15 additions and 3 deletions
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18
manual/CHAPTER_CellLib.tex
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@ -274,13 +274,25 @@ edge if this parameter is {\tt 1'b0}.
The cell with the higher integer value in this parameter wins a write conflict. The cell with the higher integer value in this parameter wins a write conflict.
\end{itemize} \end{itemize}
The {\tt \$meminit} cells have an address input \B{ADDR} and a data input \B{DATA}. Both of the inputs The {\tt \$meminit} cells have an address input \B{ADDR} and a data input \B{DATA}, with the width
must resolve to a constant for synthesis to succeed. If two {\tt \$meminit} cells have the same of the \B{DATA} port equal to \B{WIDTH} parameter times \B{WORDS} parameter. Both of the inputs
\B{MEMID} parameter and \B{ADDR} input, the contents of that memory at that address is undefined. must resolve to a constant for synthesis to succeed.
\begin{itemize} \begin{itemize}
\item \B{MEMID} \\ \item \B{MEMID} \\
The name of the RTLIL::Memory object that is associated with this initialization cell. The name of the RTLIL::Memory object that is associated with this initialization cell.
\item \B{ABITS} \\
The number of address bits (width of the \B{ADDR} input port).
\item \B{WIDTH} \\
The number of data bits per memory location.
\item \B{WORDS} \\
The number of consecutive memory locations initialized by this cell.
\item \B{PRIORITY} \\
The cell with the higher integer value in this parameter wins an initialization conflict.
\end{itemize} \end{itemize}
The HDL frontend models a memory using RTLIL::Memory objects and asynchronous The HDL frontend models a memory using RTLIL::Memory objects and asynchronous