| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To speedily copy data stored in an operation system memory to a stand-by memory without affecting any system operation. <P>SOLUTION: At the time of recognizing that a memory unit 13 at a stand-by system has been mounted, a data transferring part 12b reads the data stored in an operation memory 12a, and transfers the data through a memory copy bus 15 to the stand-by system side memory unit 13. A memory copy part 13b writes the data transferred from the operation system memory control part 12 through the memory copy bus 15 in a stand-by system memory 13a, and performs memory copy. When write in a region to which data have been already copied is performed while memory copy to the stand-by system memory 13a is executed, a write access control part 13c temporarily stores a write address and write data appearing on a common bus 14, and writes the temporarily stored write contents in the stand-by system memory 13a after the end of memory copy. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
