2017-04-25 14:41:48 +02:00
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<TITLE>Magic-7.3 Command Reference</TITLE>
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<BODY BACKGROUND=graphics/blpaper.gif>
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2022-01-21 16:44:13 +01:00
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<H1> <IMG SRC=graphics/magic_title8_2.png ALT="Magic VLSI Layout Tool Version 8.2">
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2017-04-25 14:41:48 +02:00
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<IMG SRC=graphics/magic_OGL_sm.gif ALIGN="top" ALT="*"> </H1>
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<H2>def</H2>
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<HR>
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Read or write DEF format files.
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<HR>
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<H3>Usage:</H3>
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<BLOCKQUOTE>
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<B>def</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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2022-03-30 23:32:29 +02:00
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<DT> <B>read</B> <I>filename</I> [<B>-labels</B>] [<B>-annotate</B>]
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2017-04-25 14:41:48 +02:00
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<DD> Read a DEF file <I>filename</I>[<B>.def</B>]
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2022-01-21 16:44:13 +01:00
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<DT> <B>write</B> [<I>cell</I>] [<B>-units</B> <I>value</I>]
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<DD> Write DEF for current or indicated cell named <I>cell</I>
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<DT> <B>help</B>
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<DD> Print help information (command summary)
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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>def</B> command reads and writes DEF format files. These
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files are generally assumed to be digital standard-cell based
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layouts. The DEF format has no real concept of hierarchy. To
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generate a valid DEF file that may be recognized by other
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software, it is necessary to have a layout with standard cells
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using the <B>port</B> method to declare input and output ports.
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In particular, the <B>port class</B> and <B>port use</B> are
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designed to work with the DEF read and write routines. <P>
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The technology file should have a <B>lef</B> section
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describing how LEF and DEF files should be written. However, if
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an appropriate LEF file exists and is read prior to writing a
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DEF format file, the technology will be initialized from the
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file if it is not declared in the technology file. <P>
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Normally the DEF file is written in units of nanometers according to
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the active GDS output scale (UNITS DISTANCE MICRONS 1000). If option
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"<B>-units</B> <I>value</I>" is used, then the units indicated by
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<I>value</I> are used instead of 1000. This option can be used, for
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example, to preserve units when re-writing a DEF file that was read
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with "<B>def read</B>". There is no guarantee that values can be
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accurately represented at the specified scale. The <B>-units</B>
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option was introduced in magic version 8.2.113. <P>
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The "<B>-labels</B>" option to the "<B>def read</B>" command
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causes each net in the NETS and SPECIALNETS sections of the DEF
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file to be annotated with a label having the net name as the label
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text. <P>
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2022-03-30 23:32:29 +02:00
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The "<B>-annotate</B>" option will add labels to a layout from a
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DEF file, but will not add layer geometry or subcells. This is
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useful for labeling all of the regular nets if the DEF file was
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previously read without the <B>-labels</B> option. <P>
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2017-04-25 14:41:48 +02:00
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</BLOCKQUOTE>
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<H3>Implementation Notes:</H3>
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<BLOCKQUOTE>
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<B>def</B> is implemented as a built-in <B>magic</B> command.
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Only the critical part of the DEF definition has been
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implemented. Some uncommon forms of syntax such as
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wire extensions are not implemented. This is largely due
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to the incomplete nature of the LEF/DEF spec. It is unlikely
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that such forms will be encountered in third-party input.
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</BLOCKQUOTE>
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<H3>See Also:</H3>
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<BLOCKQUOTE>
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<A HREF=lef.html><B>lef</B></A> <BR>
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<A HREF=port.html><B>port</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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2022-03-30 23:32:29 +02:00
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<P><I>Last updated:</I> March 30, 2022 at 5:31pm <P>
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2017-04-25 14:41:48 +02:00
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