mirror of
https://github.com/RTimothyEdwards/magic.git
synced 2026-08-29 17:39:28 +02:00
Tim Edwards
a816da60f9
since all of the title images still had 8.2, and the title text still said 7.3 or 7.4, having not been updated for a long time.
83 lines
2.4 KiB
HTML
83 lines
2.4 KiB
HTML
<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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A.red:link {color: red }
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A.red:visited {color: maroon }
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A.red:active {color: yellow }
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</STYLE>
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</HEAD>
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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>undo</H2>
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<HR>
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Undo commands
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<HR>
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<H3>Shortcuts:</H3>
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<BLOCKQUOTE>
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Key macro <B>U</B> implements the command <B>undo</B>.
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</BLOCKQUOTE>
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<H3>Usage:</H3>
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<BLOCKQUOTE>
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<B>undo</B> [<B>print</B> [<I>count</I>]] <BR><BR>
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<B>undo</B> <B>enable</B>|<B>disable</B> <BR><BR>
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<BLOCKQUOTE>
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where <I>count</I> indicates a number of events to be undone
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(default 1 event), and must be a nonzero positive integer.
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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>undo</B> command reverses the effect of the last
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executed command (command-line, script, or macro-invoked),
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returning the layout to the state it was in prior to
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execution of that command. <P>
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Certain commands in <B>magic</B> disable the undo mechanism,
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thus preventing the command from being undone. These include
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layout reads and writes, CIF, GDS, and LEF/DEF reads and
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writes. <P>
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The <B>print</B> option generates a stack trace of the top
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<I>count</I> events in the undo stack, in excruciating
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detail. <P>
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The <B>undo disable</B> option disables the command queue and
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prevents all following commands to be undoable until the
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<B>undo enable</B> command option is given. This can save
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time and memory for operations in a batch file where commands
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will never be able to be undone.
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</BLOCKQUOTE>
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<H3>Implementation Notes:</H3>
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<BLOCKQUOTE>
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<B>undo</B> is implemented as a built-in window command in <B>magic</B>.
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</BLOCKQUOTE>
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<H3>See Also:</H3>
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<BLOCKQUOTE>
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<A HREF=redo.html><B>redo</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> June 22, 2021 at 8:26pm <P>
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</BODY>
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</HTML>
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