US Patent No: 4,316,248

Number of patents in Portfolio can not be more than 2000

Memory refresh means including means for providing refresh addresses during power failures

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Abstract

Memory control circuitry is disclosed for providing memory refresh during battery back-up operation. Memory addressing circuitry is connected between circuitry, such as a processor, providing memory refresh addresses, and memory addressing inputs. During normal main power supply operation, refresh addresses are provided to the memory from the processor. Upon occurrence of a main power supply failure, and start of battery back-up operation, the last refresh address provided by the processor is stored in the memory addressing circuitry and successively incremented to provide refresh addresses to the memory .

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
DATA GENERAL CORPORATIONWESTBORO, MA265

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Retter, Charles T Belcamp, MD 4 138

Cited Art

Patent Info (Count) # Cites Year
 
Data General Corporation (1)
4,218,753 Microcode-controlled memory refresh apparatus for a data processing system 8 1977
 
Other [Check patent profile for assignment information] (1)
4,204,254 Electronic computer including an information refreshing arrangement 7 1978

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
HITACHI MAXELL, LTD. (2)
5,430,681 Memory cartridge and its memory control method 19 1994
5,550,781 Semiconductor apparatus with two activating modes of different number of selected word lines at refreshing 37 1995
 
CANON KABUSHIKI KAISHA (1)
4,541,044 Loop transmission with back-up power supply for the interface 3 1984
 
GLOBALFOUNDRIES INC. (1)
6,327,640 Overlapping peripheral chip select space with DRAM on a microcontroller with an integrated DRAM controller 4 1997
 
HITACHI, LTD. (1)
4,652,940 Method of identifying magnetic tape as tape for journal 24 1983
 
International Computers Limited (1)
4,901,283 Dynamic random-access memory system with power-up and power-down refresh circuits 47 1988
 
LENOVO (SINGAPORE) PTE LTD. (1)
5,615,328 PCMCIA SRAM card function using DRAM technology 17 1995
 
MAXIM INTEGRATED PRODUCTS, INC. (1)
5,914,543 Systems and methods for memory control 8 1995
 
MITSUBISHI DENKI KABUSHIKI KAISHA (1)
6,731,563 Data backup device and step-up/step-down power supply 2 2002
 
QIMONDA AG (1)
7,975,170 Memory refresh system and method 0 2007
 
ROHM CO., LTD. (1)
5,537,599 CPU controlled apparatus formed on an IC 2 1994
 
VISTEON GLOBAL TECHNOLOGIES, INC. (1)
6,115,665 Memory efficient computer system and method for controlling an automotive ignition system 2 1993