136 lines
5.4 KiB
HTML
136 lines
5.4 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-7.3 Command Reference</TITLE>
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<BODY BACKGROUND=graphics/blpaper.gif>
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<H1> <IMG SRC=graphics/magic_title2.gif ALT="Magic VLSI Layout Tool Version 7.3">
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<IMG SRC=graphics/magic_OGL_sm.gif ALIGN="top" ALT="*"> </H1>
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<H2>drc</H2>
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<HR>
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Background design rule checker control and status.
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<HR>
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<H3>Usage:</H3>
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<BLOCKQUOTE>
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<B>drc</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>catchup</B>
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<DD> Run checker and wait for it to complete
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<DT> <B>check</B>
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<DD> Recheck area under box in all cells
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<DT> <B>count</B> [<B>total</B>]
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<DD> Count error tiles in each cell under box. Option <B>total</B>
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returns the total number of DRC error tiles in the cell.
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<DT> <B>euclidean on</B>|<B>off</B>
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<DD> Enable/disable Euclidean geometry checking
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<DT> <B>find</B> [<I>nth</I>]
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<DD> Locate next (or <I>nth</I>) error in current cell
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<DT> <B>help</B>
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<DD> Print help information
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<DT> <B>off</B>
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<DD> Turn off background checker
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<DT> <B>on</B>
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<DD> Reenable background checker
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<DT> <B>status</B>
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<DD> Report whether the background checker is on or off.
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<DT> <B>printrules</B> [<I>file</I>]
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<DD> Print out design rules in <I>file</I> or to <TT>stdout</TT>
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<DT> <B>rulestats</B>
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<DD> Print out statistics about design rule database
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<DT> <B>statistics</B>
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<DD> Print out statistics gathered by checker
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<DT> <B>why</B>
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<DD> Print out reasons for errors under box
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<DT> <B>*halo</B> [<I>value</I>]
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<DD> Without option <I>value</I>, prints out the DRC halo distance,
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which is the largest distance at which a DRC interaction can
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occur outside of any area to be checked. Becuase large DRC
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haloes can cause very long delays in the interactive DRC
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checks, it can be helpful to use <I>value</I> to force a
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smaller halo. This causes certain DRC errors to be missed,
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but allows all the basic short-distance design rules to be
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checked without undue processing delays.
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<DT> <B>*stepsize</B> [<I>value</I>]
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<DD> The step size is the length of a side of the area into which
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the DRC checker routine breaks up larger areas for more
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efficient processing. Changing this value can greatly
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effect the speed of the DRC checker, although it is
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difficult to predict what step size is "optimal". Without
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option <I>value</I>, returns the current value of the
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step size.
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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>drc</B> command controls the behavior of magic's "background"
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design rule checker. Normally the design rule checker is invoked
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whenever the design is changed and checks all parts of the design
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close to the changed area that might have been affected by the
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change. The design rule checker flags areas that have been checked
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as it runs. It starts whenever a layout change has been made or
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after any command has been executed if areas of the layout still
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need to be checked. Any macro keystroke in the layout window or
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command executed on the command line will interrupt the design
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rule checker pending completion of the action, at which time
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the design rule checker will be reactivated. <P>
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The <B>drc on</B> and <B>drc off</B> options are the main controls
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for starting and stopping the design rule checker. <B>drc status</B>
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returns the status of the background checker, either "on" or "off".
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The Tcl version of magic returns a boolean value (0 or 1). <P>
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The <B>drc check</B> option marks all areas of the layout under the
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box as requiring a check and restarts the design rule checker. <P>
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The <B>drc why</B> and <B>drc find</B> commands can be used to
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query errors in the layout discovered by the design rule checker.
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<B>drc why</B> reports the reason for all error regions found
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inside the <B>magic</B> cursor box. The <B>drc find</B> command
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can be used to find errors that may not be visible inside the
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current window view, or that may be difficult to find on a large
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layout. <P>
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The <B>drc euclidean on</B> command can be useful in cases where
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vendor design rules intend a Euclidean distance metric (minimum
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linear distance) rather than a Manhattan distance metric (minimum
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distance in either the <B>x</B> or <B>y</B> direction, evaluated
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separately). The default option is "off", as most vendor rules
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and design rule checkers assume Manhattan distances when checking
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rules. <P>
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The remaining options are relativly obscure and unlikely to be
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useful to the typical end-user.</P>
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</BLOCKQUOTE>
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<H3>Implementation Notes:</H3>
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<BLOCKQUOTE>
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<B>drc</B> is implemented as a built-in <B>magic</B> command.
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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> December 4, 2005 at 5:39pm <P>
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</BODY>
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</HTML>
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