2022-01-21 16:44:13 +01:00
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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>antennacheck</H2>
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<HR>
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Run antenna violation checks on the current edit cell.
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<HR>
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<H3>Usage:</H3>
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<BLOCKQUOTE>
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<B>antennacheck</B> [<I>option</I>] <BR><BR>
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<BLOCKQUOTE>
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where <I>option</I> may be one of the following:
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<DL>
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<DT> <B>run</B>
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<DD> "<B>antennacheck run</B>" is equivalent to "<B>antennacheck</B>"
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with no arguments, and causes an antenna violation check to be
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run.
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<DT> <B>debug</B>
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<DD> Sets up debug mode for the next antenna run. In addition to
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feedback entries, additional information will be printed to
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the terminal about each error encountered.
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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>antennacheck</B> command runs a full check for antenna violations
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on the entire area of the cell being edited. Antenna violations are
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defined in the technology file as the ratios of metal area to sensitive
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MOSFET transistor gate areas to which the metal is attached. The antenna
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effect is a manufacturing problem caused by charge buildup on gates
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during metal etching. The metal being etched forms an antenna that
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gathers charge on the net connected to the gate. If the area of metal
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is large enough the gate can be destroyed by the process of etching.
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The foundry specifies what the area ratio limit must be. The check is
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done progressively from the lowest metal layer to the highest. If
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violations are found, then feedback entries are created covering the
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area of both the gate and the metal layer at which the violation occurred.
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<P>
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The <B>extract</B> command must be run prior to <B>antennacheck</B> to
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obtain the extracted characteristics of the design, so that all
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sensitive transistor gates can be identified and enumerated. <P>
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</BLOCKQUOTE>
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<H3>Implementation Notes:</H3>
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<BLOCKQUOTE>
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<B>antennacheck</B> is implemented as a built-in <B>magic</B> command.
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The <B>antennacheck</B> command was introduced in magic version
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8.2.150 along with technology file extensions to support the antenna
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rule violations (see the online Maintainer's Manual #2).
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</BLOCKQUOTE>
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<H3>See Also:</H3>
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<BLOCKQUOTE>
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<A HREF=extract.html><I>extract</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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<P><I>Last updated:</I> March 7, 2020 at 1:06pm <P>
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