losig - mbk logical signal

       The losig is used to describe a logical signal.

       The declarations needed to work on losig are available in the header
       file "/labo/include/mlo404.h", where '404' is the actual mbk version.

       The following C structure supports the description of the logical
       signal :
              typedef struct losig {
                 struct losig     ∗NEXT;
                 struct chain     ∗NAMECHAIN;
                 float            CAPA;
                 long             INDEX;
                 char             TYPE;
                 struct ptype     ∗USER;
              } losig_list;

       NEXT                Pointer to the next losig of the list.

       INDEX               Long integer beeing the signal identifier. It
                           represents the net number at a given hierachical
                           level, and must be unique.

       NAMECHAIN           Pointer to a list of names, aliases, attached to
                           the signal. If no names are given then the field
                           points to NULL. Many names can be present if the
                           signal result of the flatten of a netlist.  See
                           chain(3) for details.

       CAPA                Floating point number containing the value of the
                           total capacitance attached to a signal in respect
                           to ground. This field may be set to zero, since it
                           make sens only if the signal is the result of a
                           layout extraction, or has been used for electrical
                           simulation purposes.

       TYPE                This field can take two legal values depending on
                           the types of the connectors attached to it. See
                           locon(3) for detail.

                           EXTERNAL            The signal is connected at
                                               least to one external
                                               connector, a connector of the
                                               figure beeing described.

                           INTERNAL            The signal is connected only to
                                               instances or transistors

                           The tools using the TYPE should fill it with care,
                           since unexpected results may appear if the
                           consistency with connectors is violated.

       USER                Pointer to a ptype list, see ptype(3) for details,
                           that is a general purpose pointer used to share
                           informations on the signal.

       Remark :            the netlist view is given in terms of connectors
                           pointing to signals, but it may be useful to have
                           also the dual representation, in term of list of
                           connectors attached to a single signal. This may be
                           obtained by the lofigchain function.

       mbk(1), addlosig(3), getlosig(3), dellosig(3), lofigchain(3), locon(3),
       lofig(3), chain(3), ptype(3).

       This tool is under development at the ASIM department of the LIP6
       We need your feedback to improve documentation and tools.

ASIM/LIP6                       October 1, 1997                       LOSIG(3)