US Patent No: 4,450,559

Number of patents in Portfolio can not be more than 2000

Memory system with selective assignment of spare locations

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Abstract

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A memory system is provided with a simple flexible control arrangement for assigning locations in an alternate memory as replacements for previously identified defective fault areas in main memory. The assignment of the replacement locations in the alternate memory is made on a selective basis taking into consideration the defect status of other failure independent bit positions of a data word and the power of the ECC code which is used in connection with the memory system. A relatively small writable index, which is addressed by a subset of the main memory address signals, provides a partial address and control fields to the alternate memory in accordance with control data transferred from the host system. Control data is developed by the host system each time it is powered on and is based on identifying each defective location in main memory through a diagnostic routine and analyzing the defect distribution in a way to provide control signals which minimize the number of replacements that are assigned and maximize the number of data words that can be transferred from the memory system to the host system before an uncorrectable error is encountered by the ECC system.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
INTERNATIONAL BUSINESS MACHINES CORPORATIONARMONK, NY40098

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bond, George L Fishkill, NY 3 171
Satya, Akella V S Wappingers Falls, NY 20 863

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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FUJITSU LIMITED (1)
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UNISYS CORPORATION (1)
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* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
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7,594,063 Storage capacity status 9 2004
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7,523,249 Direct logical block addressing flash memory mass storage architecture 23 2005
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7,263,591 Increasing the memory performance of flash memory devices by writing sectors simultaneously to multiple flash memory devices 28 2006
7,549,013 Increasing the memory performance of flash memory devices by writing sectors simultaneously to multiple flash memory devices 28 2006
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7,372,751 Using redundant memory for extra features 0 2006
7,269,083 Using redundant memory for extra features 0 2006
7,734,862 Block management for mass storage 0 2007
8,166,488 Methods of directly accessing a mass storage data device 0 2007
7,944,762 Non-volatile memory control 26 2007
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7,681,057 Power management of non-volatile memory systems 7 2007
* 2008/0215,903 POWER MANAGEMENT OF NON-VOLATILE MEMORY SYSTEMS 2 2007
8,386,695 Methods and apparatus for writing data to non-volatile memory 3 2008
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7,865,659 Removable storage device 1 2008
7,908,426 Moving sectors within a block of information in a flash memory mass storage architecture 2 2008
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7,743,290 Status of overall health of nonvolatile memory 0 2008
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7,774,576 Direct logical block addressing flash memory mass storage architecture 0 2009
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8,078,797 Increasing the memory performance of flash memory devices by writing sectors simultaneously to multiple flash memory devices 2 2009
7,949,822 Storage capacity status 1 2009
* 2009/0327,595 STORAGE CAPACITY STATUS 3 2009
7,917,709 Memory system for data storage and retrieval 1 2009
* 2010/0095,055 MEMORY SYSTEM FOR DATA STORAGE AND RETRIEVAL 2 2009
8,090,886 Direct secondary device interface by a host 2 2010
8,019,932 Block management for mass storage 0 2010
* 2010/0231,408 DISPLAY CONFIGURED TO DISPLAY HEALTH STATUS OF A MEMORY DEVICE 0 2010
8,032,694 Direct logical block addressing flash memory mass storage architecture 1 2010
8,151,041 Removable storage device 0 2010
8,554,985 Memory block identified by group of logical block addresses, storage device with movable sectors, and methods 0 2011
8,135,925 Methods of operating a memory system 0 2011
8,296,545 Storage capacity status 0 2011
8,208,322 Non-volatile memory control 0 2011
8,250,294 Block management for mass storage 0 2011
8,316,165 Direct secondary device interface by a host 0 2011
8,397,019 Memory for accessing multiple sectors of information substantially concurrently 0 2011
9,032,134 Methods of operating a memory system that include outputting a data pattern from a sector allocation table to a host if a logical sector is indicated as being erased 0 2012
8,612,671 Removable devices 0 2012
9,213,606 Image rescue 0 2012
8,694,722 Memory systems 0 2013
9,026,721 Managing defective areas of memory 0 2013
8,793,430 Electronic system having memory with a physical block having a sector storing data and indicating a move status of another sector of the physical block 0 2013
 
VISTEON GLOBAL TECHNOLOGIES, INC. (1)
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TRANSPACIFIC INFRARED, LLC (1)
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Honeywell Information Systems Inc. (1)
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SANDISK TECHNOLOGIES LLC (38)
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* Cited By Examiner