Ubuntu Manpage: ocp

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 according 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 format  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 provided 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 constraints given in the <NAME>.ioc file will be respected, but
with layers 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