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           extcheck [ -c cthresh ] [ -p path ] [ -r rthresh ] [ -s sym=value  ]  [
           -C ] [ -R ] [ -S symfile ] [ -T tech ] root


           Extcheck will read an extracted circuit in the hierarchical ext(5) rep-
           resentation produced by Magic, check to ensure that  all  global  nodes
           (those  to  which  a label ending in an exclamantion point is attached)
           are fully connected in the layout, and then print a count of the number
           of  various  items  (nodes, fets, etc) encountered while flattening the
           circuit.  The root of the tree to be processed is the file root.ext; it
           and all the files it references are recursively flattened.
           The following options are recognized:
           -c cthresh
                  Set  the capacitance threshold to cthresh femtofarads.  Extcheck
                  will count the number of explicit internodal capacitors  greater
                  than  cthresh,  the number of nodes whose capacitance is greater
                  than cthresh, as well as the total number of nodes.  (Other pro-
                  grams  such  as  ext2sim(1) use this option as a threshold value
                  below which a capacitor will not be output).  The default  value
                  for cthresh is 10 femtofarads.
           -p path
                  Normally,  the  path  to  search for .ext files is determined by
                  looking for path commands  in  first  ~cad/lib/magic/sys/.magic,
                  then  ~/.magic,  then .magic in the current directory.  If -p is
                  specified, the colon-separated list of directories specified  by
                  path  is used instead.  Each of these directories is searched in
                  turn for the .ext files in a design.
           -r rthresh
                  Set the resistance threshold to rthresh ohms.  Similar in  func-
                  tion  to -c, but for resistances.  The default value for rthresh
                  is 10 ohms.
           -s sym=value
                  It's possible to use special attributes attached  to  transistor
                  gates to control the length and width of transistors explicitly,
                  rather than allowing them to be  determined  by  the  extractor.
                  These  attributes are of the form ext:w=width^ or ext:l=length^,
                  where width or length can either be numeric, or  textual.   (The
                  trailing   ''^''   indicates  that  these  are  transistor  gate
                  attributes).  If textual, they are treated as symbols which  can
                  be  assigned a numeric value at the time ext2sim is run.  The -s
                  flag is used to assign numeric values to symbols.  If a  textual
                  symbol appears in one of the above attributes, but isn't given a
                  numeric value via -s (or -S below), then it is  ignored;  other-
                  wise,  the  transistor's  length  or width is set to the numeric
                  by extcheck, but it is common to ext2sim et. al.)
           -T tech
                  Set  the technology in the output .sim file to tech.  This over-
                  rides any technology specified in the root .ext file.


           ext2dlys(1), ext2sim(1), ext2spice(1), magic(1), rsim(1), sim2spice(1),
           ext(5), sim(5)


           Walter Scott


           The  -s  mechanism is incomplete; it should allow quantities other than
           transistor lengths and widths to be specified.

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