Embodiment of the present invention may provide a switching regulator
which may be located within an IC. The switching regulator couples to an
external power supply, a plurality of configurable control registers, a
plurality of default registers, and a multiplexer. The multiplexer is
operable to select an input control signal from either the plurality of
configurable control registers or the plurality of default control
registers as the output control signal to the switching regulator. This
default control signal, although not optimal, allows the switching
regulator to be configured in a default condition during start up or
power down operations and ensures that the switching regulator may
provide a stable, although not necessarily optimal, power output to the
various components within the IC.