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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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