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1. (US5930815) Moving sequential sectors within a block of information in a flash memory mass storage architecture

Office : United States of America
Application Number: 08946331 Application Date: 07.10.1997
Publication Number: 5930815 Publication Date: 27.07.1999
Grant Number: 5930815 Grant Date: 27.07.1999
Publication Kind : A
IPC:
G06F 12/10
G06F 12/02
G06F 3/06
G06F 11/10
G11C 16/06
G11C 16/08
G11C 16/10
G11C 29/00
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
F
ELECTRIC DIGITAL DATA PROCESSING
12
Accessing, addressing or allocating within memory systems or architectures
02
Addressing or allocation; Relocation
08
in hierarchically structured memory systems, e.g. virtual memory systems
10
Address translation
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
F
ELECTRIC DIGITAL DATA PROCESSING
12
Accessing, addressing or allocating within memory systems or architectures
02
Addressing or allocation; Relocation
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
F
ELECTRIC DIGITAL DATA PROCESSING
3
Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
06
Digital input from, or digital output to, record carriers
G PHYSICS
06
COMPUTING; CALCULATING; COUNTING
F
ELECTRIC DIGITAL DATA PROCESSING
11
Error detection; Error correction; Monitoring
07
Responding to the occurrence of a fault, e.g. fault tolerance
08
Error detection or correction by redundancy in data representation, e.g. by using checking codes
10
Adding special bits or symbols to the coded information, e.g. parity check, casting out nines or elevens
G PHYSICS
11
INFORMATION STORAGE
C
STATIC STORES
16
Erasable programmable read-only memories
02
electrically programmable
06
Auxiliary circuits, e.g. for writing into memory
G PHYSICS
11
INFORMATION STORAGE
C
STATIC STORES
16
Erasable programmable read-only memories
02
electrically programmable
06
Auxiliary circuits, e.g. for writing into memory
08
Address circuits; Decoders; Word-line control circuits
G PHYSICS
11
INFORMATION STORAGE
C
STATIC STORES
16
Erasable programmable read-only memories
02
electrically programmable
06
Auxiliary circuits, e.g. for writing into memory
10
Programming or data input circuits
G PHYSICS
11
INFORMATION STORAGE
C
STATIC STORES
29
Checking stores for correct operation; Testing stores during standby or offline operation
CPC:
G06F 12/0246
G06F 3/061
G06F 3/064
G06F 3/0679
G06F 11/1068
G06F 2212/7201
G06F 2212/7202
G11C 16/08
G11C 16/102
G11C 29/765
G11C 29/82
Applicants: Lexar Media, Inc.
Inventors: Estakhri Petro
Iman Berhanu
Agents: Imam Maryam
Priority Data: 08946331 07.10.1997 US
Title: (EN) Moving sequential sectors within a block of information in a flash memory mass storage architecture
Abstract: front page image
(EN)

A method and apparatus is disclosed for increasing the system performance of a digital system having a controller for controlling nonvolatile devices for storing blocks of information, each block having a group of sectors. When sectors within a block are being re-written in sequential order, the controller writes the new sector information into a sector location of another block without the need to move any of the sectors within the original block thereby reducing the number of read and write cycles needed to avoid erase-before-write operations. A `used` flag, stored in the sector location of each block, indicates that the sector has been transferred to another block or, alternatively, a move locator word maintains status information regarding the position of the sectors within the block that have been moved.