Abstract: A memory power supply backup system aims to activate and switch a power supply backup system, to provide electric power to a memory, temporarily storing data when the power supply is interrupted abnormally to avoid losing data in the memory. When the power supply is back to normal, the computer system restores to the condition prior to the power supply interruption according to the data temporarily stored in the memory, to continue the unfinished process, thereby to enhance the reliability and stability of the computer system.

Abstract: An adapter unit operative to support access of an SATA storage device by a plurality of hosts associated with separate host adapters. The adapter unit includes a multiplexer coupled to an arbiter. The multiplexer receives a plurality of sets of communication signals, one signal set for each host adapter. The multiplexer then selects one of the signal sets based on a control signal and couples the selected signal set to its output. The arbiter receives requests from the hosts to access the SATA storage device, selects a particular requesting host, and provides the control signal indicative of the specific host granted access. The host adapter for the granted host and the SATA storage device are placed in a PHY READY power management state, prior to a read or write access, and are placed in a PARTIAL power management state after the read or write access.