COMMAND NAME:

        CLOCK

USAGE:
        CLOCK <sig_name_pos> <end_time>

        This command is used to transform a signal with the three or more 
        states into a clock.  

        The user identifies the signal <sig_name_pos> to be transformed, where
        <sig_name_pos> allows either the signal name OR position to be 
        specified. 

        If the specified signal has:
        -insufficient states to define a clock, an error message is issued
         and further editing of the signal is required.

        Since a clock is replicated throughout the life of the simulation, it
        is replicated graphically on the screen and only the portion needed to
        define the clock is stored in the database. 
