| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent stored information from being easily changed even at the occurrence of an abnormal condition in an upstream side of a system due to uncontrollable run of an OS or the like. <P>SOLUTION: A nonvolatile storage means (2) having data storage areas (2B) and management areas (2A) for them in units of predetermined physical addresses has an access protect definition table (TLB) in a predetermined physical address. The table has access attribute information defining whether to permit or not access to the data storage areas in association with the physical addresses. The memory system itself possesses the access attribute information defining whether to write into and read from the data storage areas in association with addresses to implement an access protect function for write and read. Therefore, the access protect function is maintained even if an abnormal condition occurs in a host device that manages the memory system or controls it as a peripheral circuit. <P>COPYRIGHT: (C)2008,JPO&INPIT |
