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NERO(1)			 Alliance - nero User's	Manual		       NERO(1)

       nero - Negotiating Router

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

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

       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.

       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 rout-
	 ing 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.

       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

       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)


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