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Initial commit at Tue Apr 25 08:41:48 EDT 2017 by tim on stravinsky
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Tim Edwards
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<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: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>plot</H2>
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<HR>
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Hardcopy plotting
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<HR>
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<H3>Usage:</H3>
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<BLOCKQUOTE>
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<B>plot</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>postscript</B> <I>file</I> [<I>layers</I>]
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<DD> Generate a PostScript file of layout underneath the box.
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<DT> <B>pnm</B> <I>file</I> [<I>scale</I> [<I>layers</I>]]
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<DD> Generate a <TT>.pnm</TT> ("portable anymap") file of
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layout underneath the box. The output size is propotional
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to <I>scale</I>, where a scale of 1 is one output pixel per
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<B>magic</B> internal unit. The default <I>scale</I>
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value, if unspecified, is 0.5.
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<DT> <B>parameters</B> [<I>name value</I>]
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<DD> Set or print out plotting parameters (see Summary below).
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<DT> <B>help</B>
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<DD> Print help information
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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>plot</B> command generates hardcopy plots of a layout.
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The use of <B>plot</B> for any particular output format requires
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that the parameters of the format be defined in the <B>plot</B>
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section of the technology file. However, from magic-7.3.56, the
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PNM handler will create a default set of output styles from the
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existing layout styles for the technology. This makes <B>plot
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pnm</B> compatible with <I>all</I> technology files, regardless
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of whether or not a section exists for "<B>style pnm</B>". <P>
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Each <B>plot</B> format has its own set of parameters, but all
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parameters are controlled with the <B>plot parameters</B> option.
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Valid parameters and their defaults are as follows:
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<BLOCKQUOTE>
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General parameters:
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<TABLE BORDER=0>
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<TR> <TD> <I>parameter name</I> </TD><TD> <I>default value</I> </TD> </TR>
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<TR> <TD> <B>showCellNames</B> </TD><TD> <B>true</B> </TD> </TR>
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</TABLE>
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PostScript parameters:
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<TABLE BORDER=0>
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<TR> <TD> <I>parameter name</I> </TD><TD> <I>default value</I> </TD>
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<TD> <I>explanation</I> </TD> </TR>
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<TR> <TD> <B>PS_cellIdFont</B> </TD><TD> <B>/Helvetica</B> </TD>
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<TD> Font used for writing cell use IDs</TD></TR>
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<TR> <TD> <B>PS_cellNameFont</B> </TD><TD> <B>/HelveticaBold</B> </TD>
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<TD> Font used for writing cell definition names</TD></TR>
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<TR> <TD> <B>PS_labelFont</B> </TD><TD> <B>/Helvetica</B> </TD>
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<TD> Font used for writing label text</TD></TR>
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<TR> <TD> <B>PS_cellIdSize</B> </TD><TD> <B>8</B> </TD>
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<TD> Font size for writing cell use IDs (in points)</TD></TR>
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<TR> <TD> <B>PS_cellNameSize</B> </TD><TD> <B>12</B> </TD>
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<TD> Font size for writing cell definition names (in points)</TD></TR>
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<TR> <TD> <B>PS_labelSize</B> </TD><TD> <B>12</B> </TD>
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<TD> Font size for writing label text (in points)</TD></TR>
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<TR> <TD> <B>PS_boundary</B> </TD><TD> <B>true</B> </TD>
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<TD> Whether to draw boundaries around layers in addition to
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fill patterns</TD></TR>
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<TR> <TD> <B>PS_width</B> </TD><TD> <B>612 (8.5in)</B> </TD>
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<TD> Page width of the target output</TD></TR>
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<TR> <TD> <B>PS_height</B> </TD><TD> <B>792 (11in)</B> </TD>
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<TD> Page height of the target output</TD></TR>
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<TR> <TD> <B>PS_margin</B> </TD><TD> <B>72 (1in)</B> </TD>
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<TD> Minimum margin to allow on all sides of the output page</TD></TR>
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</TABLE>
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PNM parameters:
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<TABLE BORDER=0>
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<TR> <TD> <I>parameter name</I> </TD><TD> <I>default value</I> </TD>
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<TD> <I>explanation</I> </TD> </TR>
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<TR> <TD> <B>pnmmaxmem</B> </TD><TD> <B>65536</B> </TD>
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<TD>Maximum memory (in KB) to use to generate output. Larger
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values allow larger chunks of the layout to be processed
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at a time. Normally, anything larger than the default
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will just take a long time to render, so it's better
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to leave it alone and let the <B>plot pnm</B> routine
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downsample the image to fit in memory if the size
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of the layout requires it.</TD> </TR>
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<TR> <TD> <B>pnmbackground</B> </TD><TD> <B>255</B> </TD>
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<TD>Value of the background, where 0=black and 255=white.
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White is default to match the printed page, which is
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where the plots usually end up. A value of 200 is
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approximately the default background color in <B>magic</B>.
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</TD> </TR>
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<TR> <TD> <B>pnmdownsample</B> </TD><TD> <B>0</B> </TD>
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<TD>Number of bits to downsample the original layout.
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In the first pass, one pixel is generated for each
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<I>n</I> magic internal units in each of x and y,
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where <I>n</I> is the downsampling value.
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Each downsampling bit therefore represents a factor
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of 4 in decreased computation time.
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Generally speaking, downsampling causes information to
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be lost in the translation from layout to the PNM file.
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However, if the grid has been scaled from the original
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lambda, then downsampling up to the scale factor will
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have no impact on the output other than speeding up
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the rendering (because the minimum feature size is
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still in lambda, so no feature will be overstepped by
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the downsampling). For example, for a grid scaling
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of 1:10 the proper downsampling would be 3 bits.
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Note that layouts that are too large for the allocated
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memory blocksize <B>pnmmaxmem</B> will force
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downsampling regardless of the value of
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<B>pnmdownsample</B>. </TD> </TR>
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</TABLE>
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</BLOCKQUOTE>
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PostScript plotting is best suited for drawing small layouts with
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relatively few components. PNM plotting is best suited for drawing
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large layouts. For chip-size layouts, the PNM plots are virtually
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identical to chip photographs. From magic version 7.3.56, plotting
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PNM files requires no special entries in the technology file.
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Although such entries can fine-tune the output, this is usually
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not necessary. Also, since version 7.3.56, magic makes intelligent
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decisions about memory usage, so it's generally not necessary to
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change the PNM plot parameters.
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</BLOCKQUOTE>
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<H3>Implementation Notes:</H3>
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<BLOCKQUOTE>
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<B>plot</B> is implemented as a built-in command in <B>magic</B>. <P>
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Original plot styles <B>versatec</B> and <B>gremlin</B> have been
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removed, but shells of the code are retained so that magic doesn't
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complain when encountering styles for these types in a technology
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file.
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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 3:24pm <P>
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</BODY>
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</HTML>
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