Internal shadow latch

摘要

An integrated circuit implements simple and efficient normal power to low power and low power to normal power transitions. Dedicated shadow latch circuits are added, each having a corresponding system latch. The state of the system latches is transferred to the shadow latches upon a transition from normal to low power mode and the stored information is transferred back to the system latches on the transition from low power to normal power operation. The shadow latches are optimized to minimize power usage during low power operation.