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

NAME
       ocp
	       - Standard Cell Placer

SYNOPSIS
       ocp    [options]	netlist	outputname

DESCRIPTION
       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.

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

       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.

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

IOC format
       The  IOC	 format	 is based on Cadence input-output connectors placement
       description.
       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.
       Example
       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
       )

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

SEE ALSO
       nero(1),	  MBK_IN_LO(1),	  MBK_IN_PH(1),	  MBK_OUT_PH(1),   MBK_VDD(1),
       MBK_VSS(1)

ASIM/LIP6		      September	27, 2001			OCP(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | IOC format | ENVIRONMENT VARIABLES | SEE ALSO

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