Data protection system in a data processing system

Details Data protection system in a data processing system Data protection system in a data processing system

G - Physics

06

F

320/11, 354/221

G06F 12/16 (2006.01) G06F 1/28 (2006.01) G06F 1/30 (2006.01) G06F 11/00 (2006.01) G11C 5/14 (2006.01) G11C 7/22 (2006.01)

Patent

CA 1319435

DATA PROTECTION SYSTEM IN A DATA PROCESSING SYSTEM ABSTRACT OF THE DISCLOSURE A data protection system for protecting the data stored in a memory in a data processing system having at least a channel system, a device controller and an external storage device, the data protection system including: a memory provided in the device controller and supplied a power source voltage from a power source, and temporarily storing a data to be transferred; a battery connected to the power source and the memory, and charged by the power source when the power source is normal, and supplying a battery voltage to the memory when the power source is accidentally interrupted; a first voltage check circuit connected to the battery and comparing the battery voltage with a first reference voltage and generating a battery error signal when the battery voltage is lower than the first reference voltage; a second voltage check circuit connected to the battery, and comparing the battery voltage with a second reference voltage and generating a battery charging signal when the battery voltage lies between the first reference voltage and the second reference voltage; and a control circuit for selectively determining two modes, switch being concerned about data write operation, one mode being a write-back mode for transferring the data from the memory to the external storage device after the data is stored in the memory, and the other being a write-through mode for directly transferring the data from the channel system to the external storage device not through the memory when the battery error signal and/or the battery charging signal is input thereto.

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