177 lines
7.1 KiB
HTML
177 lines
7.1 KiB
HTML
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<HTML>
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<HEAD>
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<STYLE type="text/css">
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H1 {color: black }
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H2 {color: maroon }
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H3 {color: #007090 }
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A.head:link {color: #0060a0 }
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A.head:visited {color: #3040c0 }
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A.head:active {color: white }
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A.head:hover {color: yellow }
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</STYLE>
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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_title2.gif ALT="Magic VLSI Layout Tool Version 7.3">
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<IMG SRC=graphics/magic_OGL_sm.gif ALIGN="top" ALT="*"> </H1>
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<H2>ext2spice, exttospice</H2>
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<HR>
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Convert extracted file(s) to a SPICE format file.
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<HR>
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<H3>Usage:</H3>
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<BLOCKQUOTE>
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<B>ext2spice</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 <B>ext2spice</B> on current cell, with command-line options
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(see Summary, below).
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<DT> <B>default</B>
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<DD> Reset to default values
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<DT> <B>format hspice</B>|<B>spice2</B>|<B>spice3</B>
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<DD> Set output format. <B>spice3</B> is the default,
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for compatibility with <B>tclspice</B>. This is a
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change from previous versions of magic, where the
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default was <B>hspice</B>.
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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 SPICE file.
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<DT> <B>resistor tee</B> [<B>on</B>|<B>off</B>]
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<DD> Model resistor capacitance as a T-network. Each resistor
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device is split into two, with all substrate and overlap
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capacitance placed on the node between the two half-length
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devices. Without this option, resistor devices lose all
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parasitic capacitance information, and <B>ext2spice</B>
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may produce warnings about unknown nodes. However, use of
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this option may conflict with LVS (layout-vs.-schematic),
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when only one resistor is expected per drawn device.
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<DT> <B>subcircuits</B> [<B>on</B>|<B>off</B>]
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<DD> When set to <B>on</B> (the default), standard cells become
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subcircuit calls ("X") in the SPICE output. The contents
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of the standard cells are not output, and it is assumed
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that a pre-characterized SPICE deck exists modeling the
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behavior of each standard cell definition. Standard cells
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are defined by the use of the <B>port</B> method for
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labeling input and output ports. When set to <B>off</B>,
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ports are ignored, and the entire circuit hierarchy is
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flattened down to the device level.
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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>ext2spice</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 SPICE format, used for detailed analog 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 ext2spice. 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>ext2spice</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 SPICE 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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</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>ext2spice</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>ext2spice</B>, and will automatically load the Tcl package when
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this command is invoked. <P>
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<B>exttospice</B> is an alias for <B>ext2spice</B>, to satisfy the
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grammatically anal retentive.
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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=ext2sim.html><B>ext2sim</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> October 12, 2005 at 9:40pm <P>
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</BODY>
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</HTML>
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