  A Liquid-argon Trigger Digitizer Board (LTDB) is being developed to upgrade
the ATLAS Liquid Argon Calorimeter Phase-I trigger electronics. The LTDB
located at the front end needs to obtain the clock signals and be configured
and monitored remotely from the back end. A clock and control system is being
developed for the LTDB and the major functions of the system have been
evaluated. The design and evaluation of the clock and control system are
presented in this paper.
