Title:
【発明の名称】一括消去型不揮発性メモリおよびそれを用いる半導体ディスク装置
Document Type and Number:
Japanese Patent JP2856621
Kind Code:
B2
Abstract:
A nonvolatile memory with cluster-erase flash capability. A cluster information sector is included in each of N clusters, the cluster information sector of each cluster being written with the sequence number assigned to the cluster so that no two clusters have the same sequence number. When erasing a given sector, a controller saves its sequence number prior to erasure. Then, when initializing a given erased sector, the controller sets its sequence number to a value greater than the current maximum sequence number. The controller writes user data to sectors other than the cluster information sector for the cluster thus initialized according to their address sequence. Accordingly, an invalid sector can be distinguished from a valid sector without using an overwrite approach.
Inventors:
NIIJIMA HIDETO
ASANO HIDEO
SAKAGAMI YOSHIKATSU
TOYOOKA TAKASHI
ASANO HIDEO
SAKAGAMI YOSHIKATSU
TOYOOKA TAKASHI
Application Number:
JP3522893A
Publication Date:
February 10, 1999
Filing Date:
February 24, 1993
Export Citation:
Assignee:
INTAANASHONARU BIJINESU MASHIINZU CORP
International Classes:
G06F3/08; G06F3/06; G06F12/00; G06F12/02; G11C16/02; G11C16/10; G11C17/00; (IPC1-7): G06F3/08
Other References:
【文献】半沢孝雄、磁気ディスク技法集=プログラミングハンドブック=、1978年9月30日発行、竹内書店新社発行,P33-P40
Attorney, Agent or Firm:
Hiroshi Sakaguchi (1 person outside)