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NAME

       nero - Negotiating Router

SYNOPSIS

       nero [ -h ]  [ -v ]  [ -V ]  [ -c ]  [ -2 ]  [ -3 ]  [ -4 ]  [ -5 ]  [ -6 ]  [ -L ]  [ -G ]
	[ --help ]  [ --verbose ]  [ --very-verbose ]  [ --core-dump ]	[ --local ]  [ --global ]
	[ -p placement ]  netlist layout

DESCRIPTION

       nero is a simple router suited for small academic designs. Currently it can process designs of size up to 4K gates.

   GLOBAL ROUTING
       A design is considered as big if it contains nets which half perimeter is greater than 800 lambdas.  Global routing is used on big designs.

       In  nero,  "global routing" means that the longuests nets are completly routed in a first step with only routing layers numbers 3 & 4. Then
       the smaller nets are routed with all avalaibles layers. This implies that when global routing is used, the  number  of  routing	layers	is
       forced to at least 4.  In each step, the nets are routed from the shortest to the longuest with the same routing algorithm.

INVOCATION

       nero mandatory arguments :

       o netlist :  the  name  of the design, whithout any extention. Please note that unless a -p placement option is given, the file holding the
	 placement is expected to have the same name as the netlist file (short of the extention).

       o layout : the name of the resulting routed layout. Be careful of not giving the same name as the netlist, in this case the initial  place-
	 ment will be silently overwritten.

       nero optionnals arguments :

       o -h, --help : print help.

       o -v, --verbose : be verbose.

       o -V, --very-verbose : be unbearably verbose.

       o -c, --core-dump : do not prevent the generation of core dumps in case of a crash.  Mostly used during the development stage.

       o -2, -3, -4, -5, -6 : set the numbers of layers used for routing. The default for small designs is 2 and 4 for big ones. When global rout-
	 ing took place, the router will uses at least 4 routing layers.

       o -L, --local : turn off the global routing stage, whatever the size of the design.  Be warned that this  will  enormously  slow  down  the
	 routing process.

       o -G, --global : turn on the global routing regardless of the size of the design.

       o -p placement, --place placement : specify a name for the placement file different from the netlist name.

EXAMPLE

       Route the netlist amd2901_core.vst, using the placement file amd2901_core_p.ap and store the result in amd2901_core_r.

       $ export MBK_IN_LO=vst
       $ export MBK_IN_PH=ap
       $ export MBK_OUT_PH=ap
       $ nero -V --place amd2901_core_p amd2901_core amd2901_core_r

SEE ALSO

       MBK_IN_LO(1), MBK_OUT_LO(1), MBK_IN_PH(1), MBK_OUT_PH(1), ocp(1), ocr(1), druc(1), cougar(1)

ASIM
/LIP6							  13 October 2002							   NERO(1)