ocp(1alc)

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

6       ocp
7               - Standard Cell Placer
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ORIGIN

11       This software belongs to the  ALLIANCE CAD SYSTEM developed by the ASIM
12       team at LIP6 laboratory of Université Pierre et Marie CURIE, in  Paris,
13       France.
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15       Web : http://asim.lip6.fr/recherche/alliance/
16       E-mail : alliance-users@asim.lip6.fr
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SYNOPSIS

19       ocp    [options] netlist outputname
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DESCRIPTION

23       ocp is an automatic place tool for standard-cells.
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25       input net-list
26       The netlist file describes the input net-list.
27       ocp  supports  a  hierarchical  net-list.  In this case the net-list is
28       flattened by the placer according to the  catalog  file.  The  net-list
29       format  can  be  :  structural  VHDL, EDIF, or ALLIANCE internal format
30       according to the environment variable MBK_IN_LO.
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32       output layout
33       The file containing the placed block will  have  the  name  outputname.
34       This  name is not optionnal and must always be present. The output for‐
35       mat is defined by the environment variable MBK_OUT_PH.
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OPTIONS

39       Optional cells placement file
40       -partial <NAME>
41       A user defined pre-placement can be specified, thanks  to  a  placement
42       file.
43       The  optional placement file must be given by the user. It must have an
44       extension that denotes the format defined by the  environment  variable
45       MBK_IN_PH.
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47       Optional connectors placement
48       The placement of connectors can be also specified.
49       There are four ways to place connectors in a physical view :
50       -partial  <NAME>  pre-placed connectors defined by the user can be pro‐
51       vided through the pre-placement file. In that case, automatic connector
52       placement is impossible.
53       -c  option  will  automatically place the connectors randomly. The auto
54       placement will set connectors on each side of the abutment box.
55       -ring option will automatically place the connectors for the  ring  pad
56       placement tool. The placement is random but only on the north and south
57       side unless the -ioc <NAME> option is given, in  which  case  the  con‐
58       straints  given in the <NAME>.ioc file will be respected, but with lay‐
59       ers suitable for ring.
60       -ioc <NAME> option will place connectors as specified by the <NAME>.ioc
61       given file.
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63       Margin
64       It is possible to force the free area of the physical view.
65       The  -margin <MARGIN> option allow to set The amount of free area added
66       in percentage of the cells area.
67       The resulting area will be equal to CELL_AREA * (1 + <MARGIN>).
68       By default, the margin value is 0.2 (20%)
69       -eqmargin option will distribute equitably the margin between cells. By
70       default,  the biggest possible number of 2-pitch tie cells is inserted.
71       This is done to have the best well and bulk polarity.
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73       Number of rows
74       -rows <NR> option forces the design to be placed in <NR> rows.
75       The abutment box's width is automatically generated.
76       This option won't be used if a defined placement file is given.
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78       Verbose mode
79       -v set the verbose mode on
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81       Gnuplot
82       -gnuplot option allow to  generate  automatically  gnuplot  files,  for
83       editing statistics
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IOC format

86       The  IOC  format  is based on Cadence input-output connectors placement
87       description.
88       The description is composed of 5 possibles sections:  TOP(),  BOTTOM(),
89       LEFT(), RIGHT(), and IGNORE()
90       In each section except IGNORE(), there are placed IOs.
91       In the IGNORE() section, the IOs are ignored by OCP.
92       In every section, the IO syntax could be:
93       for pin:       (IOPIN iopinName.0 );
94       for space:     SPACE  value;
95       The capital words are keywords. orientation is not required.
96       The value is the space (number of pitches) between the IO above and the
97       IO below it.
98       Example
99       TOP ( # IOs are ordered from left to right
100          (IOPIN b(3).0 );
101          (IOPIN cin.0 );
102          (IOPIN ck.0 );
103          (IOPIN cout.0 );
104       )
105       BOTTOM ( # IOs are ordered from left to right
106          (IOPIN i(3).0 );
107          (IOPIN i(4).0 );
108          (IOPIN i(5).0 );
109          (IOPIN i(6).0 );
110       )
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112       IGNORE ( # IOs are ignored(not placed) by IO Placer
113       )
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ENVIRONMENT VARIABLES

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