Patent ID: 6370628
Filing Date: 2002-04-09
Classification: G06F,G11C,Y02D

Abstract:
A nonvolatile semiconductor disk device comprising:an interface unit which transfers data; a plurality of memory units each of which has a nonvolatile semiconductor memory storing data transferred from or to said interface unit and a first buffer memory temporarily holding said data to write said data to said nonvolatile semiconductor memory; and a control unit which transfers said data from an outside device via said interface unit to said memory units when the number of writing processes that are simultaneously being executed in said plurality of memory units is smaller than a predetermined value, wherein said predetermined value is smaller than the number of said memory units, said control unit further including a memory control timer for counting the time needed for writing to each memory unit, and starts monitoring whether or not the writing operations to each memory unit are completed, with a write time counted by said memory control timer serving as a trigger.