Jean-Paul Chaput
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man_MANS = nero.1
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EXTRA_DIST = $(man_MANS)
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.\\" auto-generated by docbook2man-spec $Revision: 1.1 $
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.TH "NERO" "1" "02 October 2002" "ASIM/LIP6" "Alliance - nero User's Manual"
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.SH NAME
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nero \- Negotiating Router
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.SH SYNOPSIS
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.sp
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\fBnero\fR [ \fB-h\fR ] [ \fB-v\fR ] [ \fB-V\fR ] [ \fB-c\fR ] [ \fB-2\fR ] [ \fB-3\fR ] [ \fB-4\fR ] [ \fB-5\fR ] [ \fB-6\fR ] [ \fB-L\fR ] [ \fB-G\fR ]
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[ \fB--help\fR ] [ \fB--verbose\fR ] [ \fB--very-verbose\fR ] [ \fB--core-dump\fR ] [ \fB--local\fR ] [ \fB--global\fR ]
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[ \fB--place \fIplacement\fB\fR ] \fB\fInetlist\fB\fR \fB\fIlayout\fB\fR
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.SH "DESCRIPTION"
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.PP
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nero is a simple router suited for small
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academic designs. Currently it can process designs of size up to
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4K gates.
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.SS "GLOBAL ROUTING"
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.PP
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A design is considered as \fBbig\fR if it
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contains nets which half perimeter is greater than 800 lambdas.
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Global routing is used on big designs.
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.PP
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In nero, "global routing" means that
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the longuests nets are completly routed in a first step with only
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routing layers numbers 3 & 4. Then the smaller nets are routed with all
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avalaibles layers. This implies that when global routing is
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used, the number of routing layers is forced to at least 4.
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In each step, the nets are routed from the shortest to the
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longuest with the same routing algorithm.
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.SH "INVOCATION"
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.PP
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nero mandatory arguments\ :
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.TP 0.2i
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\(bu
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\fInetlist\fR\ : the name of
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the design, whithout any extention. Please note that unless a
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\fB-p\fR \fIplacement\fR option
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is given, the file holding the placement is expected to have the
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same name as the netlist file (short of the extention).
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.TP 0.2i
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\(bu
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\fIlayout\fR\ : the name of
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the resulting routed layout. Be careful of not giving the same
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name as the netlist, in this case the initial placement will be
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silently overwritten.
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.PP
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.PP
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nero optionnals arguments\ :
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.TP 0.2i
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\(bu
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\fB-h\fR, \fB--help\fR\ :
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print help.
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.TP 0.2i
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\(bu
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\fB-v\fR, \fB--verbose\fR\ :
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be verbose.
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.TP 0.2i
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\(bu
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\fB-V\fR, \fB--very-verbose\fR\ :
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be unbearably verbose.
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.TP 0.2i
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\(bu
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\fB-c\fR, \fB--core-dump\fR\ :
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do not prevent the generation of core dumps in case of a crash.
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Mostly used during the development stage.
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.TP 0.2i
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\(bu
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\fB-2\fR,
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\fB-3\fR,
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\fB-4\fR,
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\fB-5\fR,
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\fB-6\fR\ : set the numbers of layers
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used for routing. The default for small designs is 2 and 4 for big
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ones. When global routing took place, the router will uses at least
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4 routing layers.
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.TP 0.2i
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\(bu
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\fB-L\fR, \fB--local\fR\ :
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turn off the global routing stage, whatever the size of the design.
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Be warned that this will enormously slow down the routing process.
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.TP 0.2i
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\(bu
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\fB-G\fR, \fB--global\fR\ :
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turn on the global routing regardless of the size of the design.
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.TP 0.2i
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\(bu
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\fB-p\fR \fIplacement\fR,
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\fB--place\fR \fIplacement\fR\ :
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specify a name for the placement file different from the netlist
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name.
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.PP
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.SH "EXAMPLE"
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.PP
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Route the netlist amd2901_core.vst, using
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the placement file amd2901_core_p.ap and store the
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result in amd2901_core_r.
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.sp
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.nf
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$ \fBexport MBK_IN_LO=vst\fR
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$ \fBexport MBK_IN_PH=ap\fR
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$ \fBexport MBK_OUT_PH=ap\fR
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$ \fBnero -V --place amd2901_core_p amd2901_core amd2901_core_r\fR
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.sp
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.fi
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.SH "SEE ALSO"
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.PP
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\fBMBK_IN_LO\fR(1),
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\fBMBK_OUT_LO\fR(1),
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\fBMBK_IN_PH\fR(1),
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\fBMBK_OUT_PH\fR(1),
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\fBocp\fR(1),
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\fBocr\fR(1),
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\fBdruc\fR(1),
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\fBcougar\fR(1)
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