2017-04-25 14:41:48 +02:00
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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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2022-01-21 16:44:13 +01:00
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<H1> <IMG SRC=graphics/magic_title8_2.png ALT="Magic VLSI Layout Tool Version 8.2">
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2017-04-25 14:41:48 +02:00
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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. <BR><BR>
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<I>Note:</I> Magic version 7.5.45 changed the syntax to <BR>
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<B>plot pnm</B> <I>file</I> [<I>width</I> [<I>layers</I>]] <BR>
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where <I>width</I> is the width of the output, in pixels,
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having a default value of 1500 if unspecified (which is
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reasonably photographic when scaled to the size of a
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printed page). If the parameter "<B>pnmplotRTL</B>" is
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set to <B>true</B>, then output is filtered into HPRTL
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or HPGL2 format according to the "color versatec" style
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settings. In that case, the filename is optional; if
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missing, a temporary file is created.
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<DT> <B>svg</B> <I>file</I>
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<DD> Generate an SVG (scalable vector graphics) file of the
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exact contents of the layout window. Note that this
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command has no options other than the name of the output
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file: SVG graphics are scalable, so no scalefactor is
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necessary, and it is intended as a WYSIWYG option. This
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option is <I>only</I> availble when magic is invoked with
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the Cairo graphics interface ("<TT>magic -d XR</TT>"),
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because the <TT>libcairo</TT> library has interchangeable
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back-end rendering engines and can quickly swap out the
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X11 window rendering target for an SVG file rendering
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target, something that cannot be done in the straight-up
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Xlib or OpenGL interfaces. Note that when rendering to
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the screen, no layout can be represented below the scale
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of a screen pixel, whereas with scalable vector graphics,
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<I>all</I> layout is rendered, no matter how dense.
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Therefore, for large full-chip layouts, the SVG output
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can be very large and very dense. For full-chip rendering,
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the PNM plot style is usually a better choice.
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<DT> <B>versatec</B> <I>scale</I> [<I>layers</I>]
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<DD> Generate an HPRTL or HPGL2 rasterized rendering of the
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layout underneath the box. The <I>scale</I> value is an
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absolute scale, according to the physical size of the layout
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as determined by the CIF or GDS output style, and the
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resolution of the rendering device (i.e., printer or plotter).
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The device resolution is declared in the plot parameters
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(see below).
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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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HPRTL/HPGL2 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>cellIdFont</B> </TD><TD> <B>vfont.I.12</B> </TD>
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<TD> Font used for cell use identifier names. The default
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font is part of the Magic distribution. </TD></TR>
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<TR> <TD> <B>cellNameFont</B> </TD><TD> <B>vfont.B.12</B> </TD>
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<TD> Font used for cell definition names. The default
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font is part of the Magic distribution. </TD></TR>
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<TR> <TD> <B>labelFont</B> </TD><TD> <B>vfont.R.8</B> </TD>
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<TD> Font used for labels. The default font is part of
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the Magic distribution. </TD></TR>
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<TR> <TD> <B>directory</B> </TD><TD> <B>/tmp</B> </TD>
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<TD> The directory used to store the temporary output file
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that is generated prior to spooling for the printer. </TD></TR>
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<TR> <TD> <B>dotsPerInch</B> </TD><TD> <B>300</B> </TD>
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<TD> The native resolution of the target rendering device
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(printer or plotter) </TD></TR>
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<TR> <TD> <B>printer</B> </TD><TD> <B>versatec</B> </TD>
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<TD> Name of the print spool queue. </TD></TR>
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<TR> <TD> <B>spoolCommand</B> </TD><TD> <B>lp -d %s %s</B> </TD>
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<TD> The OS command to use to send the plot to the printer
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or plotter. </TD></TR>
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<TR> <TD> <B>swathHeight</B> </TD><TD> <B>64</B> </TD>
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<TD> The number of lines of output resolution that Magic
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will generate at a time. Normally it is not necessary to
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mess with this value. </TD></TR>
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<TR> <TD> <B>width</B> </TD><TD> <B>2400</B> </TD>
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<TD> The pixel width of the output device. </TD></TR>
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<TR> <TD> <B>plotType</B> </TD><TD> <B>hprtl</B> </TD>
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<TD> The format of the plot to make. The choices are
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<B>hprtl</B> (equivalent to PCL5) and <B>hpgl2</B> for
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the most common raster plot formats. The two (very!)
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outdated formats <B>versatec_color</B> and
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<B>versatec_bw</B> are retained for compatibility. </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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<TR> <TD> <B>pnmplotRTL</B> </TD><TD> <B>false</B> </TD>
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<TD>When set to value <B>true</B>, this parameter pipes the
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PNM plot output through the raster driver used by
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"plot versatec". This allows rendered, antialiased
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PNM plots to be sent directly to a printer. The
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versatec parameters are used to determine what format,
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printer, spooler command, temporary directory, and
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printer pixel width and resolution. The filename is
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optional in the "plot pnm" command when this parameter
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is set. If the filename is missing, a temporary filename
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will be generated for creating the file that is spooled
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to the printer queue.
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</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. Raster plotting in HPGL2 and HPRTL
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formats are a good alternative to PostScript for printers and plotters
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that support those formats. The output is not scalable, but the size
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of the output plot is much smaller and the speed of rendering is much
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faster.
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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> March 7, 2020 at 1:06pm <P>
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</BODY>
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</HTML>
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