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Tim Edwards
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unrelated nets to be captured in the same selection, due to the use of the label bounding box instead of the label rectangle. The bounding box is used for display only and should not be used for connectivity.
189 lines
7.6 KiB
HTML
189 lines
7.6 KiB
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</HEAD>
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<TITLE>Magic-7.3 Command Reference</TITLE>
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<BODY BACKGROUND=graphics/blpaper.gif>
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<H1> <IMG SRC=graphics/magic_title8_2.png ALT="Magic VLSI Layout Tool Version 8.2">
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<IMG SRC=graphics/magic_OGL_sm.gif ALIGN="top" ALT="*"> </H1>
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<H2>ext2sim, exttosim</H2>
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<HR>
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Convert extracted file(s) to a ".sim" format file.
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<HR>
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<H3>Usage:</H3>
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<BLOCKQUOTE>
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<B>ext2sim</B> [<I>option</I>] <BR><BR>
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<BLOCKQUOTE>
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where <I>option</I> is one of the following:
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<DL>
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<DT> [<B>run</B>] [<I>runtime_options</I>]
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<DD> Run exttosim on current cell, with command-line options
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(see Summary, below).
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<DT> <B>alias on</B>|<B>off</B>
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<DD> Enable/disable alias (.al) file. This file contains all of
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the node aliases (different node names that correspond to the
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same node). If "off", the statements are output directly to
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the .sim file. If "on", the statements are moved to the ".al"
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file.
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<DT> <B>labels on</B>|<B>off</B>
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<DD> Enable/disable labels (.nodes) file. The labels file is used
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by the extresist command.
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<DT> <B>default</B>
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<DD> Reset to default values
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<DT> <B>format MIT</B>|<B>SU</B>|<B>LBL</B>
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<DD> Set output format
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<DT> <B>rthresh</B> [<I>value</I>]
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<DD> Set resistance threshold value. Lumped resistances
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below this value will not be written to the output. The
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value is in ohms, or may be the keyword <B>infinite</B>
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to prohibit writing any lumped resistances to the output.
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<DT> <B>cthresh</B> [<I>value</I>]
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<DD> Set capacitance threshold value. The value is in femtofarads,
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or may be the keyword <B>infinite</B> to prohibit writing
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any parasitic capacitances to the output.
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<DT> <B>merge</B> [<I>merge_option</I>]
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<DD> Merge parallel devices/transistors. The valid merge options are:
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<BLOCKQUOTE>
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<DL>
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<DT><B>conservative</B>
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<DD> Merge transistors and capacitors having the same device
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type and node connections and having the same width and
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length. Widths are summed in the final output for
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transistors. Capacitor values are summed in the final
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output.
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<DT><B>aggressive</B>
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<DD> Merge transistors having the same node
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connections and having the same length. Widths
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are summed in the final output. Merge any capacitors
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having the same device type and node connections.
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Capacitance is summed in the final output.
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<DT><B>none</B>
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<DD> Do not merge any devices.
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</DL>
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</BLOCKQUOTE>
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<DT> <B>extresist on</B>|<B>off</B>
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<DD> Incorporate output from the command <B>extresist</B> into
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the final <TT>.sim</TT> file.
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<DT> <B>help</B>
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<DD> Print help information
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</DL>
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</BLOCKQUOTE>
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</BLOCKQUOTE>
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<H3>Summary:</H3>
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<BLOCKQUOTE>
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Without options, or with the option <B>run</B>,
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the <B>ext2sim</B> command converts the hierarchical extracted
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netlist information produced by the <B>extract</B> command in
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a series of <TT>.ext</TT> files into a flattened representation
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in the <TT>.sim</TT> format, used for switch-level simulation. <P>
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<I>runtime_options</I> may be passed on the command line, and
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represent the original command-line options passed to the
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standalone version of ext2sim. A number of the original
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command-line options have been deprecated in the Tcl-based
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version, and some are duplicated by other <B>ext2sim</B> options.
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Valid <I>runtime_options</I> are:
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<BLOCKQUOTE>
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<DL>
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<DT> <B>-B</B>
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<DD> Don't output transistor or node attributes in the .sim file.
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This option will also disable the output of information such
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as the area and perimeter of source and drain diffusion and
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the FET substrate.
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<DT> <B>-F</B>
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<DD> Don't output nodes that aren't connected to devices (floating
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nodes).
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<DT> <B>-t</B><I>char</I>
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<DD> Trim characters from node names when writing the output file.
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<I>char</I> should be either "<B>#</B>" or "<B>!</B>". The
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option may be used twice if both characters require trimming.
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<DT> <B>-y</B> <I>num</I>
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<DD> Select the precision for outputting capacitors. The default is
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1 which means that the capacitors will be printed to a precision
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of 0.1 fF.
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<DT> <B>-J</B> <B>hier</B>|<B>flat</B>
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<DD> Select the source/drain area and perimeter extraction algorithm.
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If <B>hier</B> is selected then the areas and perimeters are
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extracted only within each subcell. For each device in a
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subcell the area and perimeter of its source and drain within
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this subcell are output. If two or more devices share a
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source/drain node then the total area and perimeter will be
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output in only one of them and the other will have 0. If
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<B>flat</B> is selected the same rules apply, only the scope
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of search for area and perimeter is the whole netlist. In
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general, <B>flat</B> (which is the default) will give accurate
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results (it will take into account shared sources/drains).
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<DT> <B>-p</B> <I>path</I>
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<DD> Search the directory location <I>path</I> for .ext format
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files. This option is typically used with the "<B>extract
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path</B> <I>path</I>" command, because extraction and netlist
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generation are two independent steps. If this option is not
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specified, then by default the .ext file is expected to be in
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the same location as the corresponding .mag file, and failing
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that, the search path for .ext files is the same as the search
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path for .mag files.
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</DL>
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</BLOCKQUOTE>
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With options, the command sets various parameters affecting the
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output format and content. <P>
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</BLOCKQUOTE>
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<H3>Implementation Notes:</H3>
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<BLOCKQUOTE>
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<B>ext2sim</B> is implemented as a separate loadable Tcl package,
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but one which depends on the presence of the standard "tclmagic"
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package. <B>magic</B> is set up with a placeholder command for
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<B>ext2sim</B>, and will automatically load the Tcl package when
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this command is invoked. <P>
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<B>exttosim</B> is an alias for <B>ext2sim</B>, to satisfy the
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grammatically anal retentive.
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<B>ext2sim</B> is also implemented as a script to be run from
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the shell command line, where it executes magic in batch mode
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(i.e., using the <B>-dnull</B> option) and runs the ext2sim
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command automatically. With this usage, the syntax is:
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<BLOCKQUOTE>
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<B>ext2sim</B> [ <I>magic_options</I> <B>--</B> ]
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<I>ext2sim_runtime_options ext_file</I>
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</BLOCKQUOTE>
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The double-dash separates command options passed to magic on
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startup (such as "<B>-T</B> <I>technology</I>" to specify the
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technology) from those runtime options (see above) passed to
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the <B>ext2sim</B> command.
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</BLOCKQUOTE>
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<H3>See Also:</H3>
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<BLOCKQUOTE>
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<A HREF=extract.html><B>extract</B></A> <BR>
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<A HREF=extresist.html><B>extresist</B></A> <BR>
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<A HREF=ext2spice.html><B>ext2spice</B></A> <BR>
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<A HREF=irsim.html><B>irsim</B></A> <BR>
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</BLOCKQUOTE>
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<P><IMG SRC=graphics/line1.gif><P>
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<TABLE BORDER=0>
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<TR>
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<TD> <A HREF=commands.html>Return to command index</A>
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</TR>
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</TABLE>
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<P><I>Last updated:</I> September 13, 2021 at 12:31pm <P>
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</BODY>
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</HTML>
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