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OCP(1)			   CAO-VLSI Reference Manual			OCP(1)

	       - Standard Cell Placer

       ocp    [options]	netlist	outputname

       ocp is an automatic place tool for standard-cells.

       input net-list
       The netlist file	describes the input net-list.
       ocp  supports  a	 hierarchical  net-list.  In this case the net-list is
       flattened by the	placer according to the	 catalog  file.	 The  net-list
       format  can be :	structural VHDL, EDIF, or ALLIANCE internal format ac-
       cording to the environment variable MBK_IN_LO.

       output layout
       The file	containing the placed block will  have	the  name  outputname.
       This  name is not optionnal and must always be present. The output for-
       mat is defined by the environment variable MBK_OUT_PH.

       Optional	cells placement	file
       -partial	<NAME>
       A user defined pre-placement can	be specified, thanks  to  a  placement
       The  optional placement file must be given by the user. It must have an
       extension that denotes the format defined by the	 environment  variable

       Optional	connectors placement
       The placement of	connectors can be also specified.
       There are four ways to place connectors in a physical view :
       -partial	 <NAME>	 pre-placed connectors defined by the user can be pro-
       vided through the pre-placement file. In	that case, automatic connector
       placement is impossible.
       -c  option  will	 automatically place the connectors randomly. The auto
       placement will set connectors on	each side of the abutment box.
       -ring option will automatically place the connectors for	the  ring  pad
       placement tool. The placement is	random but only	on the north and south
       side unless the -ioc <NAME> option is given, in	which  case  the  con-
       straints	 given in the <NAME>.ioc file will be respected, but with lay-
       ers suitable for	ring.
       -ioc <NAME> option will place connectors	as specified by	the <NAME>.ioc
       given file.

       It is possible to force the free	area of	the physical view.
       The  -margin <MARGIN> option allow to set The amount of free area added
       in percentage of	the cells area.
       The resulting area will be equal	to CELL_AREA * (1 + <MARGIN>).
       By default, the margin value is 0.2 (20%)
       -eqmargin option	will distribute	equitably the margin between cells. By
       default,	 the biggest possible number of	2-pitch	tie cells is inserted.
       This is done to have the	best well and bulk polarity.

       Number of rows
       -rows <NR> option forces	the design to be placed	in <NR>	rows.
       The abutment box's width	is automatically generated.
       This option won't be used if a defined placement	file is	given.

       Verbose mode
       -v set the verbose mode on

       -gnuplot	option allow to	 generate  automatically  gnuplot  files,  for
       editing statistics

IOC format
       The  IOC	 format	 is based on Cadence input-output connectors placement
       The description is composed of 5	possibles sections:  TOP(),  BOTTOM(),
       LEFT(), RIGHT(),	and IGNORE()
       In each section except IGNORE(),	there are placed IOs.
       In the IGNORE() section,	the IOs	are ignored by OCP.
       In every	section, the IO	syntax could be:
       for pin:	      (IOPIN iopinName.0 );
       for space:     SPACE  value;
       The capital words are keywords. orientation is not required.
       The value is the	space (number of pitches) between the IO above and the
       IO below	it.
       TOP ( # IOs are ordered from left to right
	  (IOPIN b(3).0	);
	  (IOPIN cin.0 );
	  (IOPIN ck.0 );
	  (IOPIN cout.0	);
       BOTTOM (	# IOs are ordered from left to right
	  (IOPIN i(3).0	);
	  (IOPIN i(4).0	);
	  (IOPIN i(5).0	);
	  (IOPIN i(6).0	);

       IGNORE (	# IOs are ignored(not placed) by IO Placer

       ocp uses	the environment	variables MBK_VDD and MBK_VSS to know the name
       of the power signals vdd	and vss.

       nero(1),	  MBK_IN_LO(1),	  MBK_IN_PH(1),	  MBK_OUT_PH(1),   MBK_VDD(1),

ASIM/LIP6		      September	27, 2001			OCP(1)


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