mirror of
https://github.com/RTimothyEdwards/magic.git
synced 2026-08-29 09:30:46 +02:00
R. Timothy Edwards
308224109f
(1) Fixed an error that was introduced in version 8.3.590 with
a patch that should have been applied only for the case of
BJT devices, and not for MOSFETs. The patch will cause
devices generated by "device mosfet" or "device asymmetric"
to be read incorrectly from a .ext file during "ext2spice".
(2) Fixed an error in the tech file reading, where using CDL
parameters on a capacitor device would cause the tech file
loader to print an error message. The parsing was correct
and only the message should not have been printed.
(3) Added a new feature with the new command option "extract
do unique". This replaces the "extract unique" command by
running the same code within the extraction, but has the
additional effect of reverting the label changes afterward.
This prevents the user from inadvertently writing the
altered labels back to the database file.
277 lines
11 KiB
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277 lines
11 KiB
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<TITLE>Magic-8.3 Command Reference</TITLE>
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<BODY BACKGROUND=graphics/blpaper.gif>
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<H1> <IMG SRC=graphics/magic_title8_3.png ALT="Magic VLSI Layout Tool Version 8.3">
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<IMG SRC=graphics/magic_OGL_sm.gif ALIGN="top" ALT="*"> </H1>
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<H2>ext, extract</H2>
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<HR>
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Circuit netlist extractor
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<HR>
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<H3>Usage:</H3>
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<BLOCKQUOTE>
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<B>extract</B> <I>option</I> <BR><BR>
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<BLOCKQUOTE>
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where <I>option</I> may be one of the following:
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<DL>
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<DT> <B>all</B>
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<DD> Extract the root cell and all its children. This bypasses
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the incremental extraction and ensures that a new <TT>.ext</TT>
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file is written for every cell definition.
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<DT> <B>cell</B> <I>name</I>
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<DD> Extract the currently selected cell into file <I>name</I>
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<DT> <B>do</B>|<B>no</B> [<I>option</I>]
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<DD> Enable or disable an extractor option, where <I>option</I>
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may be one of the following:
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<BLOCKQUOTE>
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<DL>
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<DT> <B>capacitance</B>
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<DD> Extract local parasitic capacitance values to substrate
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<DT> <B>resistance</B>
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<DD> Extract lumped resistance values. Note that this
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is <I>not</I> the same as full parasitic resistance.
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The values extracted are "lumped" resistance and
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indicate the value for which the delay through the
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net can be computed with R times C, where R is the
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lumped resistance and C is the parasitic capacitance.
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This is a very coarse approximation, as it assumes
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equal delay from the driver to any receiver. For
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full R-C extraction, see the <B>extresist</B>
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command. Lumped resistances have no meaning in
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SPICE netlists and will only be used when running
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<B>ext2sim</B> to generate a .sim netlist.
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<DT> <B>coupling</B>
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<DD> Extract the parasitic coupling capacitance between
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nodes.
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<DT> <B>length</B>
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<DD> Extract the length of the shortest path from a driver
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to a receiver, for computing more accurate parasitic
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resistances.
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<DT> <B>adjust</B>
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<DD> Adjust all capacitances for overlap between a parent
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cell and child instance, or between instances in an
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array. Parasitic capacitance is removed to account
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for the amount of overlap. Note that this method
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can produce negative capacitors in the parent. When
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the netlist is flattened for simulation, the total
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of all capacitances in parent and child, or between
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array instances, is guaranteed to be strictly positive.
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<DT> <B>all</B>
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<DD> Apply all standard options (does not include options
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"local", "labelcheck", or "aliases").
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<DT> <B>local</B>
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<DD> Write all .ext files to the current working directory.
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If not specified, each .ext file will be placed in the
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same directory as the .mag file from which it is
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derived, unless the .mag file is in a directory which
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is not writable. In that case, the .ext file will also
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be written to the current working directory. <P>
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<I>Note:</I> As of magic version 8.3.404, "<B>extract
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do local</B>" effectively implements "<B>extract path .</B>"
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and "<B>extract no local</B>" implements "<B> extract
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path none</B>".
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<DT> <B>labelcheck</B>
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<DD> Check for labels which have zero area and connect
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to a subcell on the edge; this case is rare but is
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computationally expensive to check for, so the feature
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is disabled by default.
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<DT> <B>aliases</B>
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<DD> By default (starting with version 8.3.217), magic only
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extracts a single name for a net, unless the net connects
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to a port, in which case the port name is extracted as
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well. With the <B>aliases</B> option enabled, all names
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for a net are extracted; this can be useful for debugging
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but will usually just slow down processing by commands
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like "ext2spice" that use the .ext file contents, so it
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is disabled by default.
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<DT> <B>unique</B>
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<DD> (Added in magic version 8.3.594) This setting replaces
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the use of the command option "extract unique". Instead
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of changing labels in the design, unique labels are
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generated for the duration of the extraction, and then
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reverted back to the original text. The "extract unique"
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command option is maintained for backwards compatibility.
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Note the difference: "extract unique" is a command that
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runs immediately, and cannot be undone;
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"extract do unique" is an option setting for "extract".
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</DL>
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</BLOCKQUOTE>
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These options (except for "local") determine how much
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information is written to the output file. By default,
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all options are selected. Normally, the options in
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<B>ext2spice</B> or <B>ext2sim</B> are used to select
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which information from the .ext file is used in the
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resulting netlist. There is no need to restrict the
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information being extracted. All options add relatively
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little overhead to the extraction time. The output file
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size can be reduced by not generating some extraction
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information.
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<DT> <B>length</B> [<I>option</I>]
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<DD> Control pathlength extraction information, where <I>option</I>
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may be one of the following:
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<BLOCKQUOTE>
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<DL>
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<DT> <B>driver</B> <I>termname</I>
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<DD>
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<DT> <B>receiver</B> <I>termname</I>
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<DD>
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<DT> <B>clear</B>
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<DD>
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</DL>
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</BLOCKQUOTE>
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<DT> <B>halo</B> [<I>distance</I>]
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<DD> Return or set the maximum distance between shapes for which
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sidewall coupling is considered. <I>distance</I> is in
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the units of snap distance (lambda, by default), but like
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all distances may be specified with a suffix like "um" for
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physical distance. The default value is set by the technology
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file. Smaller values will decrease the parasitic capacitance
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extraction time at the expense of accuracy. When <I>distance</I>
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is not specified, the value returned is always in internal
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units.
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<DT> <B>help</B>
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<DD> Print help information
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<DT> <B>path</B> [<I>pathname</I>|<B>none</B>]
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<DD> Extract locally into the directory <I>pathname</I>. If
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<I>pathname</I> does not exist, then magic will attempt to
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create it. If it cannot be created, then the behavior will
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be to save extract files in the current working directory.
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If no path is set, or if <B>none</B> is specified as the
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path, then the behavior will be to extract files in the
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same directory as where the magic database (<B>.mag</B>)
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file is located, unless that directory is unwritable by
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the user, in which case the file is extracted to the
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current working diretory. Note that "<B>extract do local</B>"
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is the same as "<B>extract path .</B>" and "<B>extract no local</B>"
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is the same as "<B>extract path none</B>". Also note that
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netlist generation is independent of extraction, and needs to
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specify the same path as used by <B>extract path</B>, e.g.,
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"<B>ext2spice -p</B> <I>pathname</I>".
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<DT> <B>parents</B>
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<DD> Extract the selected cell and all its parents
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<DT> <B>showparents</B>
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<DD> List the cell and all parents of selected cell. Note that
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this is not really an extract option and is superceded by
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the <B>cellname</B> command.
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<DT> <B>stepsize</B> [<I>distance</I>]
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<DD> Return or set the step size used when breaking a layout into
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smaller parts for more efficient extraction. <I>distance</I>
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is in the units of snap distance (lambda, by default), but like
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all distances may be specified with a suffix like "um" for
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physical distance. The default value is set by the technology
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file. Both large and small values make extraction inefficient,
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and finding the optimal step size is largely trial-and-error.
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The step size in a tech file has most likely already been
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optimized for extraction speed. When <I>distance</I> is not
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specified, the value returned is always in internal units.
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<DT> [<B>list</B>|<B>listall</B>] <B>style</B> [<I>stylename</I>]
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<DD> Set the current extraction style to <I>stylename</I>.
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Without arguments, print the current extraction style.
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With keyword <B>list</B>, return the current extraction
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style as a Tcl result. With keyword <B>listall</B>, return
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all valid extraction styles for the technology as a Tcl
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list.
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<DT> <B>unique</B> [<I>#</I>]
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<DD> Generate unique names when different nodes have the same name.
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When option "<I>#</I>" is present, only make unique names for
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labels tagged by ending with the "<B>#</B>" character. <BR>
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<I>Warning:</I> This operation immediately modifies the
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existing layout in preparation for extraction. Label
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modifications are permanent, and cannot be undone. All
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cells in the hierarchy may potentially be modified. <BR>
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<DT> <B>unique</B> [<I>option</I>]
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<DD> (From Magic 8.1.24) With no option, generate unique names
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when different nodes have the same name. <I>option</I> may
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be one of the following:
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<BLOCKQUOTE>
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<DL>
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<DT> <B>all</B>
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<DD> Equivalent to no option; all labels with the same
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name on different nets are given unique names.
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<DT> <B>#</B>
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<DD> Labels that are tagged by ending with the character
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"<B>#</B>" are made unique for each instance on an
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electrically unique node.
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<DT> <B>noports</B>
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<DD> Labels that are not ports are made unique when on
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different nets. Ports, however, are ignored. This
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option is useful for standard cells which may be
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hiding internal connectivity.
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<DT> <B>notopports</B>
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<DD> This option behaves like <B>extract unique noports</B>
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on the topmost cell in the hierarchy, and otherwise
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behaves like <B>extract unique all</B> on all cells
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below the top (available from magic 8.3.205).
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</DL>
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</BLOCKQUOTE>
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<I>Warning:</I> This operation immediately modifies the
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existing layout in preparation for extraction. Label
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modifications are permanent, and cannot be undone. All
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cells in the hierarchy may potentially be modified. <BR>
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<DT> <B>warn</B> [[<B>no</B>] <I>option</I>]
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<DD> Enable/disable reporting of non-fatal errors, where <I>option</I>
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may be one of the following:
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<BLOCKQUOTE>
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<DL>
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<DT> <B>fets</B>
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<DD>
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<DT> <B>labels</B>
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<DD>
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<DT> <B>dup</B>
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<DD>
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<DT> <B>all</B>
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<DD>
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</DL>
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</BLOCKQUOTE>
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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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With no options given, the <B>extract</B> command incrementally
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extracts the root cell and all its children into separate
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<TT>.ext</TT> files. With options, the effect is as described
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in the Usage section above.
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</BLOCKQUOTE>
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<H3>Implementation Notes:</H3>
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<BLOCKQUOTE>
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<B>extract</B> is implemented as a built-in <B>magic</B> command. <P>
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<B>ext</B> is an alias for command <B>extract</B> (allowed
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abbreviation where the usage would otherwise be ambiguous).
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</BLOCKQUOTE>
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<H3>See Also:</H3>
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<BLOCKQUOTE>
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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=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 8, 2021 at 4:56pm <P>
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