公开(公告)号：JPH086736A

公开(公告)日：1996-01-12

申请号：JP13468694

申请日：1994-06-16

Applicant: IBM JAPAN

Inventor： NIIJIMA HIDETO ,  MUNETO SEIJI ,  MURATA HIROKI ,  TAKAHASHI NOBUAKI

IPC: G06F12/16 ,  G06F3/06 ,  G06F11/10 ,  G06F11/18 ,  G06F11/20

Abstract: PURPOSE:To write and read data fast through simple constitution. CONSTITUTION:This disk storage device is equipped with two data buses 100 and 200 for data transfer and an HDD 0 and an HDD 1 are connected fixedly to the data buses 100 and 200, respectively, and an MCU 32 outputs a specific signal to a DPC 10 according to a command from a host, and then multiplexers 20 and 22 connect the HDD 2 and HDD 3 to either of the data buses 100 and 200. Thus, the HDD 2 and HDD 3 are connected to one of the data buses 100 and 200 and data are written on and read out of HDDs 0-3.

公开(公告)号：JPH07114577A

公开(公告)日：1995-05-02

申请号：JP31994493

申请日：1993-12-20

Applicant: IBM

Inventor： SATO AKASHI ,  NIIJIMA HIDETO

IPC: H03M7/46 ,  G06F17/30 ,  G06T9/00 ,  H03M7/30

Abstract: PURPOSE: To enable the retrieval of data at a high speed. CONSTITUTION: When retrieving a retrieval character string (ABCA) corresponding to a character string (BABCABB...), which is successively stored in the associated memory cell sequences of an associated memory 26, to be retrieved, the data of the 1st character (A) in the retrieval character string are inputted to a buffer 56 and a comparing operation is performed for all the cell sequences. The operation of comparison with the next character (B) is performed only for the cell sequence of addresses (2) and (5) adjacent with the cell sequence coincident the last time. Similarly, the operation of comparison with the next character (C) is performed only for the cell sequence of addresses (3) and (6). Further, the comparison with the final character (A) is performed only for the cell sequence of an address (4) adjacent to the cell sequence of the address (3) coincident the last time. In this case, even when the length of the retrieval character string is a variable length, only the number of times to repeat the comparing operation is changed and especially when the character string to be retrieved is long, retrieval processing is completed within an extremely short time in comparison with conventional device.

公开(公告)号：JPH06274409A

公开(公告)日：1994-09-30

申请号：JP5024793

申请日：1993-03-11

Applicant: IBM

Inventor： NIIJIMA HIDETO ,  TOYOOKA TAKASHI

IPC: G06F12/00 ,  G06F3/06 ,  G06F11/10 ,  G06F11/14 ,  G06F12/02 ,  G06F12/06 ,  G06F12/16 ,  G11C16/02 ,  G11C17/00 ,  G11C16/06

Abstract: PURPOSE: To enhance resistance against fault like power cutoff, etc., in a semiconductor disk device which uses a batch erasure type non-volatile memory. CONSTITUTION: A batch erasure type non-volatile memory contains plural sectors and attribute information for recognizing their own attribute is written in every sector. As a rule, a cluster information sector is placed at the front position of a cluster to which it belongs. Then, data sector is placed in a data area which is an area except the front position of a cluster. A controller connected to the memory produces a cluster information copy sector in a data are at the time of cluster erasure, reconstitutes cluster management information from the cluster information copy sector and produces a cluster information sector at the time of cluster initialization.

公开(公告)号：JPH06111589A

公开(公告)日：1994-04-22

申请号：JP24311892

申请日：1992-09-11

Applicant: IBM

Inventor： NIIJIMA HIDETO ,  TOYOOKA TAKASHI ,  SATO AKASHI ,  SAKAGAMI YOSHIKATSU

IPC: G11C17/00 ,  G06F11/10 ,  G11C16/02 ,  G11C16/06 ,  G11C16/16 ,  G11C16/22 ,  G11C29/00 ,  G11C29/04 ,  G11C29/42 ,  H01L21/8247 ,  H01L27/115 ,  H01L29/788 ,  H01L29/792

Abstract: PURPOSE: To obtain the efficient redundant constitution of a batch erasing type nonvolatile semiconductor storage device. CONSTITUTION: The array of a memory cell 31 is physically divided into a data area 36 and a tag area 37 to separately batch-erase the respective areas while sharing a word line 32. In the unit of the areas 36 and 37 sharing one word line, the area 37 holds positional information of a defective memory cell in the area 36. Based on this information, a system executes the using avoiding processing of the defective memory cell. Defective memory cell information is programmed in an inspection process after producing a chip, and ECC is written in the area 37 with respect to this defective memory cell information. By writing fixed data in the area 37, the using prohibition of the area 36 sharing the word line with the area 37 is reported to the system. Even when the area 36 is batch-erased, the area 37 is not erased and defective memory cell positional information is held.