194 lines
8.1 KiB
HTML
194 lines
8.1 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: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>cif</H2>
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<HR>
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Read CIF input or generate CIF output.
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<HR>
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<H3>Usage:</H3>
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<BLOCKQUOTE>
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<B>cif</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>help</B>
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<DD> Print usage information
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<DT> <B>arealabels</B> [<B>yes</B>|<B>no</B>]
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<DD> Enable/diable use of the CIF area label extension. The
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default is "yes". Normally there is no reason not to
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do this.
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<DT> <B>coverage</B> <I>layer</I>
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<DD> Report the coverage of the indicated CIF layer within the
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bounds of the current edit cell. This is useful for
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fabrication processes that require a minimum amount of
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coverage for specific layers (usually the metal routing
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layers).
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<DT> <B>idcell</B> [<B>yes</B>|<B>no</B>]
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<DD> Enable/diable use of the CIF cell ID extension. The
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default is "yes". Normally there is no reason not to
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do this.
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<DT> <B>lambda</B> <B>in</B>|<B>out</B>
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<DD> Report the number of microns per lambda for the current
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style. If "<B>in</B>" is specified, the value is
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reported for the current CIF/GDS input style. If
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"<B>out</B>" is specified, the value is reported for
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the current CIF/GDS output style.
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<DT> <B>limit</B> [<I>value</I>]
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<DD> Limit the amount of internal grid subdivision to the
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indicated value (which is dimensionless, the ratio
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of the maximum subdivision to the current lambda
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value). If no <I>value</I> is given, the current
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limit is reported. By default, the value is set to
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100, as grid subdivision smaller than this amount
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can result in integer overflow on subsequent CIF or
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GDS output.
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<DT> <B>rescale</B> [<B>yes</B>|<B>no</B>]
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<DD> Allow or disallow internal grid subdivision while reading
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CIF input. Default is "yes". Normally, one wants to allow
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rescaling to ensure that the CIF is displayed exactly as it
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is in the input file. Occasionally, however, the CIF input
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is on a very fine scale, such as nanometers, and it is
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preferable to snap the input to lambda boundaries rather
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than to subsplit the internal grid to such a fine value.
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The <B>limit</B> option may also be used to limit grid
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subdivision to a minimum value (see above).
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<DT> <B>warning</B> [<I>option</I>]
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<DD> Set warning information level. "<I>option</I>" may be one
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of the following:
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<DL>
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<DT><B>default</B>
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<DD> The default setting is equivalent to all the other
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options (<B>align</B>, <B>limit</B>, <B>redirect</B>,
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and <B>none</B>) being disabled.
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<DT><B>align</B>
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<DD> Generate warnings during a "<B>cif see</B>" command
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if the alignment of geometry is on fractional lambda.
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Normally, magic allows contacts to be drawn at
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half-lambda positions. If this violates DRC requirements
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for the minimum output grid, this warning setting can be
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used to detect such violations.
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<DT><B>limit</B>
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<DD> Limit warnings to the first 100 warnings or errors only.
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<DT><B>redirect</B> [<I>file</I>]
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<DD> Redirect all warnings to an output file named <I>file</I>.
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If <I>file</I> is not given, then redirection is disabled.
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<DT><B>none</B>
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<DD> Do not produce any warning messages on CIF input.
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</DL>
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<DT> <B>polygon subcells</B> [<B>yes</B>|<B>no</B>]
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<DD> Put non-Manhattan polygons into subcells. Default is "no".
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Normally this option is not needed. However, input layout
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that defines a number of angled wires, particularly those
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that are closely spaced, can cause <B>magic</B> to generate
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literally millions of internal tiles. This tends to be
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true in particular for corner cells in padframes for deep
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submicron feature sizes, where the angled corners are
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required to meet the DRC specification. When set to "yes",
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each polygon encountered in the CIF input is placed in its
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own uniquely-named subcell. This prevents interations with
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other polygons on the same plane and so reduces tile splitting.
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<DT> <B>see</B> <I>layers</I>
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<DD> View the CIF/GDS output layers in the comma-separated list
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<I>layers</I> as feedback entries on the layout. This is
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useful for determining what the actual foundry layer types
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are doing as a result of the boolean operations in the
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CIF/GDS output style. Most useful for debugging technology
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file CIF/GDS output style sections, or tracing DRC error
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reports from sources other than <B>magic</B>. CIF output
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is computed and feedback is shown only inside the cursor
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box area.
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<CENTER>
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<IMG SRC=graphics/cif_see.gif> <BR>
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<I>Figure 1. Command <B>cif see CSP</B> shows the P+
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implant layer surrounding the P diffusion regions within
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the cursor box area.</I>
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</CENTER>
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<DT> <B>statistics</B>
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<DD> Print statistics from the CIF generator, including tile
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operations, rectangles output, and interactions between
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cells. Not especially useful to the typical end-user.
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<DT> <B>prefix</B> [<I>path</I>]
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<DD> Prepend the path name <I>path</I> to cell names in the
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CIF output. If no <I>path</I> is specified, reports the
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existing path name.
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<DT> [<B>list|listall</B>] <B>istyle</B> [<I>style</I>]
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<DD> Set the current input style to <I>style</I>. If no
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<I>style</I> is specified, returns the current input
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style. To get a list of all available input styles
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in the current technology, use the <B>listall
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istyle</B> option. The <B>list istyle</B> option
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returns the current style name as a Tcl result.
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<DT> [<B>list|listall</B>] <B>ostyle</B> [<I>style</I>]
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<DD> Set the current output style to <I>style</I>. If no
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<I>style</I> is specified, returns the current output
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style. To get a list of all available output styles
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in the current technology, use the <B>listall
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ostyle</B> option. The <B>list ostyle</B> option
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returns the current style name as a Tcl result.
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<DT> <B>flat</B> <I>file</I>
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<DD> Output CIF format to "<I>file</I>" for the window's root
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cell, flattening the hierarchy prior to output.
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<DT> <B>read</B> <I>file</I>
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<DD> Read CIF format from file <I>file</I> into the edit cell.
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If <I>file</I> does not have a file extension, then <B>magic</B>
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searches for a file named <I>file</I> or <I>file</I>.cif.
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<DT> <B>write</B> <I>file</I>
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<DD> Output CIF format to "<I>file</I>" for the window's root cell.
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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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The <B>cif</B> command reads CIF input or produces CIF input/output
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("Caltech Intermediate Format", as described in Mead & Conway),
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or sets various parameters affecting the CIF (and GDS) input and
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output. Certain <B>cif</B> command options also affect GDS input
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and output. <P>
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If no option is given, a CIF file is produced for the root cell,
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with the default name of the root cell definition and the
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filename extension ".cif". <P>
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</BLOCKQUOTE>
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<H3>Implementation Notes:</H3>
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<BLOCKQUOTE>
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<B>cif</B> is implemented as a built-in function in <B>magic</B>.
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Options <B>list</B> and <B>listall</B> cause output to be
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returned as a Tcl result, rather than printed to stdout (the
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console).
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</BLOCKQUOTE>
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<H3>See Also:</H3>
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<BLOCKQUOTE>
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<A HREF=gds.html><B>gds</B> (<B>calma</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 4, 2004 at 8:03am <P>
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</BODY>
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</HTML>
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