204 lines
7.0 KiB
TeX
204 lines
7.0 KiB
TeX
%----------------------------------------------------------------------------
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% Magic Addendum: Version 6.5 differences
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%----------------------------------------------------------------------------
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\NeedsTeXFormat{LaTeX2e}[1994/12/01]
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\documentclass[letterpaper,twoside,12pt]{article}
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\usepackage{epsfig,times}
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\setlength{\textwidth}{8.5in}
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\addtolength{\textwidth}{-2.0in}
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\setlength{\textheight}{11.0in}
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\addtolength{\textheight}{-2.0in}
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\setlength{\oddsidemargin}{0in}
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\setlength{\evensidemargin}{0pt}
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\setlength{\topmargin}{-0.5in}
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\setlength{\headheight}{0.2in}
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\setlength{\headsep}{0.3in}
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\setlength{\topskip}{0pt}
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\def\hinch{\hspace*{0.5in}}
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\def\starti{\begin{center}\begin{tabbing}\hinch\=\hinch\=\hinch\=hinch\hinch\=\kill}
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\def\endi{\end{tabbing}\end{center}}
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\def\ii{\>\>\>}
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\def\mytitle{Magic Addendum: Version 6.5 differences}
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%----------------------------------------------------------------------------
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\begin{document}
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\makeatletter
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\newcommand{\ps@magic}{%
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\renewcommand{\@oddhead}{\mytitle\hfil\today}%
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\renewcommand{\@evenhead}{\today\hfil\mytitle}%
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\renewcommand{\@evenfoot}{\hfil\textrm{--{\thepage}--}\hfil}%
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\renewcommand{\@oddfoot}{\@evenfoot}}
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\newcommand{\ps@mplain}{%
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\renewcommand{\@oddhead}{}%
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\renewcommand{\@evenhead}{}%
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\renewcommand{\@evenfoot}{\hfil\textrm{--{\thepage}--}\hfil}%
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\renewcommand{\@oddfoot}{\@evenfoot}}
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\makeatother
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\pagestyle{magic}
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\thispagestyle{mplain}
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\begin{center}
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{\bfseries \Large \mytitle} \\
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\vspace*{0.5in}
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{\itshape Stefanos Sidiropoulos} \\
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\vspace*{0.5in}
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Center for Integrated Systems \\
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Stanford University \\
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Stanford, CA 94305 \\
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\vspace*{0.25in}
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This tutorial corresponds to Magic version 7. \\
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\end{center}
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\vspace*{0.5in}
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{\noindent\bfseries\large Affected Documents:}
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\starti
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\> Magic Tutorial \#6: Design-Rule Checking \\
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\> Magic Tutorial \#9: Format Conversion for CIF and Calma \\
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\> Magic Tutorial \#W-1: Design-Rule Extensions \\
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\> Magic Maintainer's Manual \#2: The Technology File \\
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\> Magic man pages: ext2sim(1), ext2spice(1), extflat(3), ext(5).
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\endi
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\vspace*{0.25in}
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\section{Introduction}
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Magic 6.5 has some significant modifications that make some of the
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original version 6 documents obsolete. The purpose of this addendum
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is to highlight these differences so that users can take advantage
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of the new features.
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\section{Extractor Extensions}
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The 6.5 extractor uses double precision floating point numbers
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to represent capacitances. Therefore all the capacitances
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in (aF/sq-lambda) associated with
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the {\itshape areacap, perimc, sidewall, sideoverlap} keywords
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in the extract section of the technology file can be {\itshape floating point
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numbers}.
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Additionally the extension of the capacitance to floating point numbers
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affects the manual pages of ext2sim(1), ext2spice(1), extflat(3), ext(5)
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which can be found in your local system under CAD{\_}HOME/man
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The 6.5 extractor shields the perimeter capacitance from layer to layer.
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To facilitate this two new commands {\itshape planeorder, noplaneordering}
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have been introduced and the {\itshape sideoverlap} command has been modified.
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The syntax for the new commands is:
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\starti
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\ii {\bfseries planeorder} {\itshape plane num }
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\endi
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Where {\itshape plane} is one of the defined planes and {\itshape num} is a positive
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integer indicating the ordering of this plane from lower to higher. So for
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example the metal1 plane has order 3 while metal2 has order 4.
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In case you dont want to specify the order of the planes the extractor
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will complain and assume a default one. If you want to suppress the
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warning you just have to issue the keyword:
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\starti
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\ii {\bfseries noplaneordering }
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\endi
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The {\itshape sideoverlap} keyword syntax has been altered to:
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\starti
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\ii {\bfseries sideoverlap} {\itshape intypes outtypes ovtypes cap shieldtypes}
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\endi
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where {\itshape intypes}, {\itshape outtypes}, and {\itshape ovtypes} are type-lists
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and {\itshape cap} is capacitance in attofarads per lambda.
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This is the capacitance associated with an edge with a type
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in {\itshape intypes} on its inside and a type in {\itshape outtypes} on
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its outside, that overlaps a tile whose type is in {\itshape ovtypes}.
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If the {\itshape shieldtypes} is present however this shields the capacitance.
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So for example to shield metal-2 to poly capacitance use:
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\starti
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\ii {\bfseries sideoverlap} M2Cap \~{}M2Cap PolyCap 19.41 M1Cap
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\endi
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\section{DRC Extensions}
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This version includes code fragments implemented in DEC-WRL by Don Stark
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which enable to implement more complicated DRC rules. For a description
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of these enhancements look in the magic tutorial \#W1 which can be
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found in the file doc/tutwrl1.ps under the magic source tree.
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\section{CIF extensions}
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Two new commands have been integrated in the cif output section courtesy
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of Steven Tell and Fred Heaton at UNC.
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The first new command is a command that
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enables the generation of DRC correct layers at the top level (such as
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the nwell in the SCMOS tech files). The syntax is:
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\starti
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\ii {\bfseries min-width} {\itshape width }
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\endi
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The width argument is in centimicrons. This command should be specified
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within a layer sub-section of the cifoutput section of the technology
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file.
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The second command is an extension to the squares cif output command.
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Its syntax is:
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\starti
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\ii {\bfseries squares-grid} {\itshape border size separation grid}
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\endi
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The added argument is {\itshape grid}. It is
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in units of centi-microns. In some technologies, all features
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must fall on a specified grid. In our case, this was a .05
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micron grid. In the original implementation of magic, if lambda
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was not set to some integral multiple of the grid one could
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generate contacts that did not fall on grid boundaries. By
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specifying the grid spacing, the new enhancement to the contact
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generation code will allow contacts to be generated on grid.
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This does introduce some problems. In particular, some odd
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size contacts will not be able to generate a CIF contact structure
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that is centered on its corresponding magic contact. This is
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not a problem in most cases, except where an odd size contact
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is shared between two cells. In this case, the CIF contact
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strucuture might be shifted to the left during CIF generation
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to get it on grid and the other cell might be shifted to the
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right. The superposition of these two structures may create
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an illegal contact size or spacing. Use with extreme care or combine
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it with cifwidth and cifspacing rules to verify correct operation.
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\section{New commands}
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Three new commands have been introduced (based on the WRL code fragments
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by Bob Mayo):
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\starti
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\ii {\bfseries goto} {\itshape nodename}
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\endi
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Places the box/cross over the node named {\itshape nodename}.
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\starti
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\ii {\bfseries findlabel} {\itshape labelname}
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\endi
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Places the box/cross over the label {\itshape nodename}.
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\starti
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\ii {\bfseries flatten} {\itshape destname}
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\endi
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Flattens the cell in the current layout window and places it in the cell
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named {\itshape cellname}. The labels are changed to retain their hierarchical
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prefixes.
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\end{document}
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