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<TITLE>Magic-7.3 Command Reference</TITLE>
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<H1> <IMG SRC=graphics/magic_title2.gif ALT="Magic VLSI Layout Tool Version 7.3">
<IMG SRC=graphics/magic_OGL_sm.gif ALIGN="top" ALT="*"> </H1>
<H2>ext2spice, exttospice</H2>
<HR>
Convert extracted file(s) to a SPICE format file.
<HR>
<H3>Usage:</H3>
<BLOCKQUOTE>
<B>ext2spice</B> [<I>option</I>] <BR><BR>
<BLOCKQUOTE>
where <I>option</I> is one of the following:
<DL>
<DT> [<B>run</B>] [<I>runtime_options</I>]
<DD> Run <B>ext2spice</B> on current cell, with command-line options
(see Summary, below).
<DT> <B>default</B>
<DD> Reset to default values
<DT> <B>format hspice</B>|<B>spice2</B>|<B>spice3</B>
<DD> Set output format. <B>spice3</B> is the default,
for compatibility with <B>tclspice</B>. This is a
change from previous versions of magic, where the
default was <B>hspice</B>.
<DT> <B>rthresh</B> [<I>value</I>]
<DD> Set resistance threshold value. Lumped resistances
below this value will not be written to the output. The
value is in ohms, or may be the keyword <B>infinite</B>
to prohibit writing any lumped resistances to the output.
<DT> <B>cthresh</B> [<I>value</I>]
<DD> Set capacitance threshold value. The value is in femtofarads,
or may be the keyword <B>infinite</B> to prohibit writing
any parasitic capacitances to the output.
<DT> <B>merge</B> [<I>merge_option</I>]
<DD> Merge parallel devices/transistors. The valid merge options are:
<BLOCKQUOTE>
<DL>
<DT><B>conservative</B>
<DD> Merge transistors and capacitors having the same device
type and node connections and having the same width and
length. Widths are summed in the final output for
transistors. Capacitor values are summed in the final
output.
<DT><B>aggressive</B>
<DD> Merge transistors having the same node
connections and having the same length. Widths
are summed in the final output. Merge any capacitors
having the same device type and node connections.
Capacitance is summed in the final output.
<DT><B>none</B>
<DD> Do not merge any devices.
</DL>
</BLOCKQUOTE>
<DT> <B>extresist on</B>|<B>off</B>
<DD> Incorporate output from the command <B>extresist</B> into
the final SPICE file.
<DT> <B>resistor tee</B> [<B>on</B>|<B>off</B>]
<DD> Model resistor capacitance as a T-network. Each resistor
device is split into two, with all substrate and overlap
capacitance placed on the node between the two half-length
devices. Without this option, resistor devices lose all
parasitic capacitance information, and <B>ext2spice</B>
may produce warnings about unknown nodes. However, use of
this option may conflict with LVS (layout-vs.-schematic),
when only one resistor is expected per drawn device.
<DT> <B>subcircuits</B> [<B>on</B>|<B>off</B>]
<DD> When set to <B>on</B> (the default), standard cells become
subcircuit calls ("X") in the SPICE output. The contents
of the standard cells are not output, and it is assumed
that a pre-characterized SPICE deck exists modeling the
behavior of each standard cell definition. Standard cells
are defined by the use of the <B>port</B> method for
labeling input and output ports. When set to <B>off</B>,
ports are ignored, and the entire circuit hierarchy is
flattened down to the device level.
<DT> <B>help</B>
<DD> Print help information.
</DL>
</BLOCKQUOTE>
</BLOCKQUOTE>
<H3>Summary:</H3>
<BLOCKQUOTE>
Without options, or with the option <B>run</B>,
the <B>ext2spice</B> command converts the hierarchical extracted
netlist information produced by the <B>extract</B> command in
a series of <TT>.ext</TT> files into a flattened representation
in SPICE format, used for detailed analog simulation. <P>
<I>runtime_options</I> may be passed on the command line, and
represent the original command-line options passed to the
standalone version of ext2spice. A number of the original
command-line options have been deprecated in the Tcl-based
version, and some are duplicated by other <B>ext2spice</B> options.
Valid <I>runtime_options</I> are:
<BLOCKQUOTE>
<DL>
<DT> <B>-B</B>
<DD> Don't output transistor or node attributes in the SPICE file.
This option will also disable the output of information such
as the area and perimeter of source and drain diffusion and
the FET substrate.
<DT> <B>-F</B>
<DD> Don't output nodes that aren't connected to devices (floating
nodes).
<DT> <B>-t</B><I>char</I>
<DD> Trim characters from node names when writing the output file.
<I>char</I> should be either "<B>#</B>" or "<B>!</B>". The
option may be used twice if both characters require trimming.
<DT> <B>-y</B> <I>num</I>
<DD> Select the precision for outputting capacitors. The default is
1 which means that the capacitors will be printed to a precision
of 0.1 fF.
<DT> <B>-J</B> <B>hier</B>|<B>flat</B>
<DD> Select the source/drain area and perimeter extraction algorithm.
If <B>hier</B> is selected then the areas and perimeters are
extracted only within each subcell. For each device in a
subcell the area and perimeter of its source and drain within
this subcell are output. If two or more devices share a
source/drain node then the total area and perimeter will be
output in only one of them and the other will have 0. If
<B>flat</B> is selected the same rules apply, only the scope
of search for area and perimeter is the whole netlist. In
general, <B>flat</B> (which is the default) will give accurate
results (it will take into account shared sources/drains).
</DL>
</BLOCKQUOTE>
With options, the command sets various parameters affecting the
output format and content. <P>
</BLOCKQUOTE>
<H3>Implementation Notes:</H3>
<BLOCKQUOTE>
<B>ext2spice</B> is implemented as a separate loadable Tcl package,
but one which depends on the presence of the standard "tclmagic"
package. <B>magic</B> is set up with a placeholder command for
<B>ext2spice</B>, and will automatically load the Tcl package when
this command is invoked. <P>
<B>exttospice</B> is an alias for <B>ext2spice</B>, to satisfy the
grammatically anal retentive.
</BLOCKQUOTE>
<H3>See Also:</H3>
<BLOCKQUOTE>
<A HREF=extract.html><B>extract</B></A> <BR>
<A HREF=ext2sim.html><B>ext2sim</B></A> <BR>
</BLOCKQUOTE>
<P><IMG SRC=graphics/line1.gif><P>
<TABLE BORDER=0>
<TR>
<TD> <A HREF=commands.html>Return to command index</A>
</TR>
</TABLE>
<P><I>Last updated:</I> October 12, 2005 at 9:40pm <P>
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