Source : Free On-Line Dictionary of Computing

southbridge
     
         The {integrated circuit} in a {core logic}
        {chip set} that controls the {IDE} bus, {USB}, {plug-n-play}
        support, the {PCI}-{ISA} bridge, keyboard/mouse controller,
        {power management}, and various other features.  One brand
        provides {sound card} functions.
     
        Other functions are provided by the {northbridge} chip.
     
        {(http://www.maximumpc.com/terminator/terminator_s.html)}.
     
        (2000-01-15)