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<TITLE>Magic-7.3 Command Reference</TITLE>
<BODY BACKGROUND=graphics/blpaper.gif>
<H1> <IMG SRC=graphics/magic_title2.gif ALT="Magic VLSI Layout Tool Version 7.3">
<IMG SRC=graphics/magic_OGL_sm.gif ALIGN="top" ALT="*"> </H1>
<H2>select</H2>
<HR>
Select or unselect portions of the layout according to the options, or
create a new cell definition from a selection.
<HR>
<H3>Shortcuts:</H3>
<BLOCKQUOTE>
Key macro <B>,</B> (comma) implements the command <B>select clear</B>. <BR>
Key macro <B>s</B> implements the command <B>select</B>. <BR>
Key macro <B>S</B> implements the command <B>select more</B>. <BR>
Key macro <I>Control-</I><B>S</B> implements the
command <B>select less</B>. <BR>
Key macro <B>a</B> implements the command <B>select visible</B>. <BR>
Key macro <B>A</B> implements the command <B>select more visible</B>. <BR>
Key macro <I>Control-</I><B>A</B> implements the
command <B>select less visible</B>. <BR>
Key macro <B>i</B> implements the command <B>select cell</B>. <BR>
Key macro <B>I</B> implements the command <B>select more cell</B>. <BR>
Key macro <I>Control-</I><B>I</B> implements the
command <B>select less cell</B>.
</BLOCKQUOTE>
<H3>Usage:</H3>
<BLOCKQUOTE>
<B>select</B> <I>option</I> <BR><BR>
<BLOCKQUOTE>
where <I>option</I> may be one of the following:
<DL>
<DT> [<B>more</B> | <B>less</B>] [<I>layers</I>]
<DD> [De]select material under cursor, or
[de]select a subcell if the cursor is over space.
<DT> <B>nocycle</B> [<I>layers</I>]
<DD> Select material without cycling through different tile
types when "select" is called from the same cursor position
more than once.
<DT> [<B>more</B> | <B>less</B>] <B>area</B> [<I>layers</I>]
<DD> [De]select all material under box in layers <I>layers</I>
<DT> [<B>more</B> | <B>less</B>] <B>visible</B> [<I>layers</I>]
<DD> [De]select all visible material under box in layers <I>layers</I>.
<DT> [<B>more</B> | <B>less</B>] <B>box</B> [<I>layers</I>]
<DD> [De]select material specified by the boundary of the cursor box
<DT> [<B>more</B> | <B>less</B>] <B>chunk</B> [<I>layers</I>]
<DD> [De]select a network chunk (largest rectangle) specified by
the lower left corner of the cursor box
<DT> [<B>more</B> | <B>less</B>] <B>region</B> [<I>layers</I>]
<DD> [De]select a network region specified by
the lower left corner of the cursor box
<DT> [<B>more</B> | <B>less</B>] <B>net</B> [<I>layers</I>]
<DD> [De]select an entire electrical network specified by
the lower left corner of the cursor box
<DT> [<B>more</B> | <B>less</B>] <B>cell</B> [<I>name</I>]
<DD> [De]select the cell under cursor, or the cell use (instance)
named <I>name</I>.
<DT> <B>top cell</B>
<DD> Select the topmost cell in the window, which does not have
an instance name and therefore cannot be selected with the
<B>select cell</B> command.
<DT> <B>save</B> <I>cell</I>
<DD> Save selection as cell named <I>cell</I>, which is also
saved to disk as <I>cell</I><TT>.mag</TT>.
<DT> <B>clear</B>
<DD> Clear selection
<DT> <B>pick</B>
<DD> Remove the selection from the layout, but retain the
selection buffer for interactive processing.
<DT> <B>keep</B>
<DD> Copy the selection from the layout into the selection
buffer, and keep the selection buffer for interactive
processing.
<DT> <B>move</B> <I>x y</I>
<DD> Move the selection buffer to position <I>x y</I>,
relative to the cell definition origin.
<DT> <B>help</B>
<DD> Print help information
</DL>
</BLOCKQUOTE>
</BLOCKQUOTE>
<H3>Summary:</H3>
<BLOCKQUOTE>
The <B>select</B> command changes what material is in the current
selection. <B>magic</B> maintains a separate cell definition
that represents the current selection. Without the options
<B>more</B> or <B>less</B>, the selection is cleared prior to
executing the new selection command. Otherwise, <B>more</B>
adds to the existing selection and <B>less</B> subtracts from
it. <P>
Network selection differs from other types of selection in
that <B>magic</B> uses a sophisticated algorithm to determine
what is electrically connected together throughout the layout.
A <B>chunk</B> is the largest rectangle containing a single
layer type. A <B>region</B> is the largest network area
containing a single layer type. The region stops where the
net connects to a different layer type. The <B>net</B> is
the entire electrical network. <P>
The <B>select save</B> options differs from the rest in that it
does not alter the current selection, but creates a new cell
definition from the current selection. Note that this cell
is created as a top-level cell, and does not replace the current
selection as a use in the edit cell. To do that requires
"<B>select save</B> <I>cell</I>" followed by "<B>delete</B>"
and "<B>getcell child 0 0 parent 0 0</B>". The last command
syntax is used because the bounds of the selection may differ
from the cursor box.
</BLOCKQUOTE>
<H3>Implementation Notes:</H3>
<BLOCKQUOTE>
<B>select</B> is implemented as a built-in command in <B>magic</B>.
The <B>select keep</B>, <B>select move</B>, and <B>select pick</B>
are interactive functions used by the "pick" tool.
</BLOCKQUOTE>
<H3>Bugs:</H3>
<BLOCKQUOTE>
To be consistent, <B>select save</B> should be a separate command,
since like other commands it operates on the selection rather than
alter what is in the selection.
</BLOCKQUOTE>
<P><IMG SRC=graphics/line1.gif><P>
<TABLE BORDER=0>
<TR>
<TD> <A HREF=commands.html>Return to command index</A>
</TR>
</TABLE>
<P><I>Last updated:</I> December 4, 2005 at 5:06pm <P>
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