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<TITLE>Magic-7.3 Command Reference</TITLE>
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<H1> <IMG SRC=graphics/magic_title2.gif ALT="Magic VLSI Layout Tool Version 7.3">
<IMG SRC=graphics/magic_OGL_sm.gif ALIGN="top" ALT="*"> </H1>
<H2>tech</H2>
<HR>
Query properties of the current technology, or change the current
technology.
<HR>
<H3>Usage:</H3>
<BLOCKQUOTE>
<B>tech</B> <I>option</I> <BR><BR>
<BLOCKQUOTE>
where <I>option</I> may be one of the following:
<DL>
<DT> <B>load</B> <I>filename</I> [<B>-noprompt</B>][<B>-nooverride</B>]
<DD> Load a new technology from the file <I>filename</I>[<TT>.tech</TT>].
<DT> <B>help</B>
<DD> Display help information
<DT> <B>name</B>
<DD> Show current technology name
<DT> <B>filename</B>
<DD> Show current technology filename
<DT> <B>version</B>
<DD> Show current technology version and description strings
<DT> <B>lambda</B>
<DD> Show internal units per lambda
<DT> <B>planes</B>
<DD> Show defined planes
<DT> <B>layers</B> [<I>layer</I>]
<DD> Show defined layers
<DT> <B>drc</B> <I>option</I>
<DD> Query the DRC ruleset, where <I>option</I> is one of the
following:
<DL>
<DT> <B>width</B> <I>layer</I>
<DD> Return the minimum allowed width for the indicated
layer type.
<DT> <B>spacing</B> <I>layer1</I> [<I>layer2</I>]
<DD> Return the minimum allowed spacing between
<I>layer1</I> and <I>layer2</I>, if <I>layer2</I>
is specified, or between <I>layer1</I> and itself,
if not.
</DL>
</DL>
</BLOCKQUOTE>
</BLOCKQUOTE>
<H3>Summary:</H3>
<BLOCKQUOTE>
The <B>tech</B> command queries aspects of the current
technology, and can also be used to change the current
technology. The <B>tech load</B> command completely
replaces the technology. Normally a call to <B>tech load</B>
generates a dialog window asking the user for confirmation,
since the <B>tech load</B> command is potentially destructive
and can cause loss of an existing layout. The <B>-noprompt</B>
option forces a technology load without presenting a dialog.
This is particularly useful to put a "<B>tech load</B> <I>name</I>
<B>-noprompt</B>" command in a <TT>.magic</TT> startup
file in the directory of a project, so that it is not necessary to
specify the technology on the command line when invoking <B>magic</B>.
However, occasionally one may want to run magic from the same
project directory with a different technology.
The <B>-nooverride</B> option prevents the <B>tech load</B> command
from overriding a technology name entered on the UNIX
command line when starting <B>magic</B>. <P>
Technology file reloading is especially useful when
developing a technology file, to immediately see the
results of a change made to the file. The current
technology can be reloaded with the simple Tcl command
"<B>tech load [tech filename]</B>". <P>
Note that there is a slightly different meaning between
the command "<B>tech layers</B>" and "<B>tech layers "*"</B>".
The former prints a formatted list of layers, including all
aliases for each layer, to the console. The second returns
a Tcl list of all layers, with only the primary name for
each layer. <P>
A few aspects of the technology must be queried from other
commands. The CIF/GDS input and output styles are given
by the <B>cif istyle</B> and <B>cif ostyle</B> commands, while
the extraction style is given by the <B>extract style</B>
command. <P>
The <B>drc</B> option is intended for use by Tcl scripted
procedures that wish to place layout while satisfying the
DRC rules. The two accepted <I>rule</I> options are
<B>spacing</B> and <B>width</B>.
</BLOCKQUOTE>
<H3>Implementation Notes:</H3>
<BLOCKQUOTE>
<B>tech</B> is implemented as a built-in command in <B>magic</B>.
The command replaces the original <B>techinfo</B> command, which
no longer exists.
</BLOCKQUOTE>
<H3>Bugs:</H3>
<BLOCKQUOTE>
<B>tech drc</B> may not return the correct value in all cases.
</BLOCKQUOTE>
<P><IMG SRC=graphics/line1.gif><P>
<TABLE BORDER=0>
<TR>
<TD> <A HREF=commands.html>Return to command index</A>
</TR>
</TABLE>
<P><I>Last updated:</I> October 16, 2004 at 1:59pm <P>
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