2022-01-21 16:44:13 +01:00
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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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2022-01-21 16:44:13 +01:00
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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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2022-01-21 16:44:13 +01:00
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<IMG SRC=graphics/magic_OGL_sm.gif ALIGN="top" ALT="*"> </H1>
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<H2>drop</H2>
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<HR>
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Paint into descendents of the current edit cell coincident with a selection.
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<HR>
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<H3>Usage:</H3>
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<BLOCKQUOTE>
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<B>drop</B> <I>layers</I> <BR><BR>
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<BLOCKQUOTE>
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where <I>layers</I> is a comma-separated list of types to paint.
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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>drop</B> command paints layer types into descendents of the
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current edit cell where selected paint is found. Normally, paint and
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erase operations will only change the current edit cell. Selections
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can copy paint out of descendents of the current edit cell, but the
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descendent cells are not themselves affected. This specialized
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command scans an existing selection and determines from which
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subcell each bit of paint in the selection was copied from. Then,
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it paints <I>layers</I> back into those subcells in an area coincident
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with the selected paint. <P>
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The primary reason this command was created was to deal with regions
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such as a pwell region inside a deep nwell. The pwell is often not
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a layer in the GDS but is defined by the absence of nwell, over a
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deep nwell layer. A drawn pwell is needed for magic to properly
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extract the bulk terminal of any transistor in the pwell. But the
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pwell must exist in the same cell as the transistor. After reading
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GDS, a command sequence such as the following: "<B>select area dnwell ;
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select intersect ~nwell ; drop pwell</B>" will ensure that the pwell
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layer exists over the area inside a deep nwell p-region. <P>
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Be aware that because other instances of a cell may exist outside of
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the selection area, that all instances of a cell modified by <B>drop</B>
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will be likewise modified. <P>
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</BLOCKQUOTE>
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<H3>Implementation Notes:</H3>
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<BLOCKQUOTE>
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<B>drop</B> is implemented as a built-in 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=select.html><B>select</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> March 25, 2021 at 9:48pm <P>
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