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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Patent Owner(s)

Patent OwnerAddressTotal Patents
INTERNATIONAL BUSINESS MACHINES CORPORATIONARMONK, NY74974

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bond, George L Fishkill, NY 3 163
Satya, Akella V S Milpitas, CA 24 722

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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UNISYS CORPORATION (1)
4,375,664 Apparatus for detecting, correcting and logging single bit memory read errors using syndrome generating and decoding circuitry 31 1980
 
UNWIRED PLANET, LLC (1)
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Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
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7,865,659 Removable storage device 1 2008
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7,949,822 Storage capacity status 1 2009
7,917,709 Memory system for data storage and retrieval 1 2009
8,090,886 Direct secondary device interface by a host 1 2010
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8,151,041 Removable storage device 0 2010
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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
8,612,671 Removable devices 0 2012
8,694,722 Memory systems 0 2013
 
SANDISK CORPORATION (31)
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Other [Check patent profile for assignment information] (1)
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