Provided by: alliance_5.1.1-3_amd64 bug


       s2r    - Process mapping from symbolic layout to physical layout


       s2r [-tc1rv] source [result]


       The  goal of s2r is to perform the translation from the symbolic layout to physical layout
       for the foundry.  s2r uses a technolgy file whose name is  defined  by  the  environnement
       variable RDS_TECHNO_NAME.
       Some  cells, like I/O pads, are specific to a given foundry.  In the symbolic methodology,
       these cells are phantom cells.  It means that only their abutment box and  and  connectors
       are  present.   s2r  wil substitute physical cells to the symbolic phamtom cells.  Beware,
       this implies that the manufacturer cells must be modified by hand to ensure  the  abutment
       box  is  a  symbolic  grid  step  multiple,  and  that the real connectors are centered on
       symbolic grid.
       In order for the replacement to work well, the physicals cells must have the abutment  box
       lower  left corner at coordinate (0,0) The name of cells to be replaced are written in the
       catalog file with the G attribute, see catal(5)  for  details  on  that  file.   See  also
       ring(1) for more on pads.  Ouput can be generated in either cif or gds formats, to fit the
       manufacturer requirements.

       Mainly two kinds of users are concerned with s2r :

       experts              they should be able to parametrize the  technology  file  for  a  new
                            process technology file is described in techno(5).

       designers            they  are not directly concerned with the target process, but need to
                            be able to compute real capacitances for simulation.

       The source argument is the name of  the  symbolic  layout  file  to  be  translated.   The
       optional  result  argument indicates the name to be given to the real layout output.  This
       name is also the name of the top level model of the layout hierarchy.  If result  name  is
       omitted, then source name is used.

       Six  environment variables must be set for proper usage of s2r, all of them having default
       values, thus ensuring the possibility of using it ``as it is''.

       MBK_IN_PH            The input format for symbolic layout is  given  by  this  environment
                            variable.   The  possible  values  are   cp,  ap. Default is cp.  See
                            MBK_IN_PH(1) for details.

       MBK_CATA_LIB         Sets the directories that are to be searched thru for reading  files.
                            The  seaching  mecanism  first  look  in MBK_WORK_LIB(1) MBK_WORK_LIB
                            defines the path where the generated file is saved.   Make  sure  the
                            write permissions are set up correctly, otherwise no save will occur.

       MBK_CATAL_NAME       This   indicates   the   name  of  the  catalog  file  used  for  pad
                            substitution.  For the appropriate syntax of this file, see catal(5).

       RDS_IN               Defines the format to be used as input for  cell  substitution.   The
                            available ones are cif and gds (default one).  The cells to be parsed
                            must  not  containt  45  degrees  wires.  If  an  unknown  layer   is
                            encountered, the entire cell will be skipped.

       RDS_OUT              Gives  the  format of the output file.  This may be either cif or gds
                            (default is gds).

       RDS_TECHNO_NAME      This points to the technology file to be used for  symbolic  to  real
                            translation.   This  file  is  in  general  shared  between  all  the
                            designers.  it is the full path name to the file location,  with  the


       Without  option, s2r should produce a layout that fits for the foundry.  Nevertheless, its
       behaviour can be modified when invoked with the following options:

       -t                   Suppress the denotching phase. s2r performs gap  filling,  denotching
                            in  order  to avoid DRC errors. This operation is time consuming.  It
                            is mandatory for the foundry but not really  useful  for  capacitance

       -c                   Deletes  connectors  and  node  names at all hierarchy level.  Theses
                            objects link the physical view and the logical view of  a  chip.   If
                            simulation  is  to  be  done  after physical mapping, connectors must
                            appear, so that the extractors and simulators  can  use  them.   This
                            must not be used when preparing a final layout for the foundry.
                            For  the  factory, the top level connectors are forbidden, since they
                            do not represent any physical reality.

       -1                   Creates the top level cell with the instances as black  boxes.   This
                            may be useful for hierarchical extractors, since the file size may be
                            greatly reduced.

       -r                   does not replace black boxes.  Cells flagged with the G attribute  in
                            the  catal(5)  file  will  not be replaced by their equivalent layout
                            loaded from disk.

       -v                   verbose mode on.


              You should first have a correct execution environment :
              It is recommanded to put it in the ``.cshrc'' file if in c shell, as in the example

              setenv MBK_IN_PH       ap
              setenv MBK_WORK_LIB      ~fred/mbk/layout
              setenv MBK_CATA_LIB      ~franck/s2r:/alliance/cells
              setenv MBK_CATAL_NAME    catalog
              setenv RDS_TECHNO_NAME   /labo/etc/prol15.rds
              setenv RDS_IN            gds
              setenv RDS_OUT           gds
              s2r -c na2_y
              This  invocation will produce the cell na2_y from the standard cell library in real
              layout, without connectors, scotches if needed, in gds format.


       mbk(1),  ring(1),  MBK_IN_PH(1),  MBK_CATA_LIB(1),   MBK_WORK_LIB(1),   MBK_CATAL_NAME(1),
       RDS_IN(1), RDS_OUT(1), RDS_TECHNO_NAME(1), techno(5), catal(5).


       The  actual version of the gds parser and driver doesn't translate neither connectors, nor
       node names.  If an extraction on  s2r  output  is  needed,  cif  format  will  create  the
       connectors using cif extension 4X, and the node names with 4N.