2017-04-25 14:41:48 +02:00
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</HEAD>
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2024-01-09 22:37:00 +01:00
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<TITLE>Magic-8.3 Command Reference</TITLE>
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2017-04-25 14:41:48 +02:00
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<BODY BACKGROUND=graphics/blpaper.gif>
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2024-01-09 22:37:00 +01:00
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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>instance</H2>
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<HR>
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Operations on cell instances (uses).
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<HR>
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<H3>Usage:</H3>
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<BLOCKQUOTE>
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<B>instance</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>list</B>] <B>children</B> [<I>name</I>]
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<DD> List all of the children instances of cell use <I>name</I>,
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or the children of the currently selected cell instance.
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<DT> [<B>list</B>] <B>parent</B> [<I>name</I>]
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<DD> List the parent cell definition of cell use <I>name</I>,
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or the parent of the currently selected cell instance.
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<DT> [<B>list</B>] <B>exists</B>|<B>self</B> [<I>name</I>]
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<DD> Returns the name of the instance if the cell exists, or false
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(0) if the instance does not exist (is not loaded into the
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database; the cell may still exist on disk). If <I>name</I>
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is not present, returns the name of the currently selected
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instance.
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<DT> [<B>list</B>] <B>allcells</B>
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<DD> List all of the cell instances in the database. Note that
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expansion is not automatic, so cells that are not expanded
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are not searched.
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<DT> <B>orientation</B> [<I>name</I>] [<B>-def</B>]
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<DD> Returns the orientation of the instance. By default, returns
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the orientation in the naming convention used by the
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"<B>getcell</B>" command. If the option "<B>-def</B>" is
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specified, then the orientation is given in the naming
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convention used by the DEF format for component placement.
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if <I>name</I> is given, then return the orientation of the
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named instance. Otherwise, the orientation of all selected
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instances is returned as an unordered list.
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<DT> [<B>list</B>] <B>abutment</B>
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<DD> Returns the coordinates of the instance's abutment box
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(the bounding box formed by the coordinates saved in the
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FIXED_BBOX property in the cell), translated into the
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coordinate system of the parent cell (which must be the
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edit cell). This should be used, for example, when
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replacing an instance of a standard cell with another
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standard cell, to move the cursor box to the abutment box
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position so that the new cell has the same alignment as
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the old cell (see also <B>orientation</B>, above).
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<DT> <B>lock</B>|<B>unlock</B> [<I>name</I>]
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<DD> Locking an instance prevents it from being moved, rotated,
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flipped, deleted, or copied. This is useful, for example,
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when part of a layout is declared "final" and changes to
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that area are prohibited. The cell instance's lock status
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can be saved to and read from the layout file, so the lock
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will remain in effect until the instance is unlocked.
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Cells that are locked have the character "<B>*</B>" prepended
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to the instance name in the display. With no <I>name</I>
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given to the command, the lock will be applied to all
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selected cell instances.
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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>instance</B> command performs various operations on
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cell uses, or instances. For the first four options listed
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above, <B>instance</B> lists cells by their relationship to
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cell use <I>name</I>, or to the current selection if no
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<I>name</I> is given. The optional argument <B>list</B>
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returns the result as a list. In particular, in the Tcl
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version of magic, this list is a Tcl result that may be
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operated on by Tcl procedures. <P>
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</BLOCKQUOTE>
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<H3>Implementation Notes:</H3>
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<BLOCKQUOTE>
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<B>instance</B> is implemented as a built-in function in <B>magic</B>
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The Tcl version of magic returns Tcl results when the "<B>list</B>"
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option is present. <B>instance</B> is essentially an alias for the
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<B>cellname</B> command, and takes many of the same options, but
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references are to cell instances rather that cell definitions
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(q.v.). A number of options to <B>cellname</B> are meaningless
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for instances. <P>
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2022-01-21 16:44:13 +01:00
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<I>Warning:</I> Because instance names are arbitrary, looking up
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an instance name is computationally intensive compared to looking
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up a cell name. When used inside a loop, such as to search the
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cell name hierarchy, use command <B>cellname</B> on cell definitions
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instead of command <B>instance</B> on cell instance names whenever
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possible. <P>
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2017-04-25 14:41:48 +02:00
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The command option <B>instance list exists</B> is nonsensical from
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the standpoint of the end-user (if the cell is selected, of course
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it exists). However, it is a very useful function for Tcl scripts
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to determine the name of the cell instance that is currently
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selected.
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</BLOCKQUOTE>
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<H3>Bugs:</H3>
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<BLOCKQUOTE>
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Technically, <B>instance rename</B> should be implemented as a
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replacement for the command <B>identify</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=cellname.html><B>cellname</B></A> <BR>
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<A HREF=load.html><B>load</B></A> <BR>
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<A HREF=getcell.html><B>getcell</B></A> <BR>
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<A HREF=tk_path_name.html><I>tk_path_name</I></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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2022-01-21 16:44:13 +01:00
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<P><I>Last updated:</I> January 15, 2021 at 12:47pm <P>
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2017-04-25 14:41:48 +02:00
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