Provided by: alliance_5.0-20110203-4_i386 bug


       cougar - Hierarchical netlist extractor


       cougar  [  -v  ]  [  -c  ]  [  -f ] [ -t ] [ -ar ] [ -ac ] input_name [
       output_name ]


       Lynx changed its name to Cougar during May 2002 in order to avoid  name
       conflict   with   the  famous  text-mode  Web  browser.   Cougar  is  a
       hierarchical layout extractor.  It builds a netlist of interconnections
       from  a  symbolic  layout  view.  The input argument is the name of the
       symbolic layout cell to be extracted, using as  input  format  the  one
       selected  by  the  MBK_IN_PH(1)  environment  variable.   If  output is
       present, the resulting netlist will be given this name.  If  no  output
       is  given,  then  input  will  also be the generated netlist name.  The
       output format is specified by the MBK_OUT_LO(1) environment variable.
       As most of the Alliance  cad  tools,  cougar  uses  mbk(1)  environment
       variables.      MBK_CATA_LIB(1),     MBK_WORK_LIB(1),     MBK_IN_PH(1),

       Cougar computes capacitances attached to the signals if the -ac  option
       is  set. At the moment, the value of these capacitances is computed for
       a typical one micron technology, and cannot  be  changed  by  the  user
       through  a technology file.  The extracted netlist can be simulated for
       performance evaluation.
       The typical capacitances are given below in 10e-18 farad / lamda^2 :

       POLY                100

       ALU1                50

       ALU2                25


       Cougar checks the two basic ALLIANCE rules regarding connector names:
              If two physical connectors are connected to the same  net,  they
              must have the same name.
              If  two  physical  connectors  have  the same name, they must be
              internally connected to the same net.
       As a result only one logical connector will appear in the  netlist.   A
       fatal  error  occurs  if  one of those two rules is violated ( even for
       power and ground connectors )

       When no options  are  specified,  the  current  hierarchical  level  is
       extracted.   The  resulting  netlist is the list of interconnections of
       the current layout hierarchy level.  Three  options  are  available  to
       change cougar behaviour :

       -t     Notifies a transistor level extraction, the symbolic layout cell
              is flattened to transistor layout before extraction.

       -f     The symbolic layout cell  is  flattened  to  the  catalog  level
              before  extraction.  Use "man catal" for detail on  the  catalog
              file.  If the catalog is empty, or doesn't exist, the netlist is
              an  interconection  of transistors, if  it isn't, the netlist is
              an interconection of gates or blocks whose names are defined  in
              the catalog.

       -v     Verbose  mode  on.   Each step of the extraction is displayed on
              the standard  output, along  with some statistics.

       -c     Generates a core file representing  the  conflictuel  net,  when
              cougar  detects  two external connectors with different names on
              the same signal, or when it finds two external connectors having
              the  same  name but not internally connected to the same net, or
              when it cannot correctly extract an L shaped transistor.

       -ac    Extract capacitance to ground on losig.

       -ar    Extract interconnect resistance and capacitance to ground. Value
              of resistance foreach layer can be changed in the RDS file.


        prompt> cougar -v amd2901
              Gives   a   logical   netlist  of  the  chip  amd2901,  for  one
              hierarchical level, using verbose mode.  This would be typically
              used  to  verify  the work of the ring(1) router, in conjunction
              with lvx on the specificated netlist and the extracted one.

       prompt> cat $MBK_WORK_LIB/$MBK_CATAL_NAME
       prompt> cougar -f amd2901
              Gives a logical netlist of the chip  amd2901,  after  a  flatten
              operation  stopping  on the cells specified in the catalog ( the
              standard cell library in our case ).

       prompt> cougar -t amd2901
              Gives a logical netlist of the amd2901 chip  at  the  transistor
              level.   This  is  useful  with  yagle(1),  to  retrieve logical
              equations from a layout.


       al(5),     MBK_CATA_LIB(1),     MBK_WORK_LIB(1),     MBK_CATAL_NAME(1),
       MBK_IN_PH(1), catal(5), RDS_TECHNO_NAME(1).