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

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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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Patent Owner(s)

Patent OwnerAddressTotal Patents
DATA GENERAL CORPORATIONWESTBORO, MA52

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Retter, Charles T Belcamp, MD 4 180

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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 61 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 25 1983
 
International Computers Limited (1)
* 4,901,283 Dynamic random-access memory system with power-up and power-down refresh circuits 49 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 9 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 1 2007
 
ROHM CO., LTD. (1)
* 5,537,599 CPU controlled apparatus formed on an IC 3 1994
 
VISTEON GLOBAL TECHNOLOGIES, INC. (1)
* 6,115,665 Memory efficient computer system and method for controlling an automotive ignition system 2 1993
* Cited By Examiner