| 摘要 |
The power control circuitry comprises a series of power switching circuits, each power switching circuit being associated with one of the circuit portions and being provided with an enable signal and responsive to its enable signal being set to connect the voltage source to the at least one voltage line of the associated circuit portion. Further, at least one enable qualifying circuit is provided, each such enable qualifying circuit being associated with one of the power switching circuits and being arranged to generate an output signal used to determine the enable signal provided to a later power switching circuit in the series. Each enable qualifying circuit sets its output signal when both the enable signal provided to the associated power switching circuit is set and the at least one voltage line of the circuit portion associated with that power switching circuit has reached a predetermined voltage level.
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