US Patent No: 6,175,514

Number of patents in Portfolio can not be more than 2000

Content addressable memory device

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Abstract

A content addressable memory device is provided which may include a novel CAM cell structure which reduces the total power dissipated by the CAM and improves the match time for the CAM. The novel CAM cell structure may include a CMOS implemented compare cell and a wide AND gate which combines the match decisions for each CAM cell into a match decision. The CAM cell structure may be implemented in a variety of different CAM devices, including dual port CAM devices, CAM devices with individual bit masking, event co-processors and database co-processors.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
INTEL CORPORATIONSANTA CLARA, CA24136

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Croft, Walter E San Mateo, CA 20 399
Henderson, Alex E Hillsborough, CA 26 394

Cited Art

Patent Info (Count) # Cites Year
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
5,471,189 Comparator circuitry and method of operation 18 1994
 
MITEL SEMICONDUCTOR LIMITED (1)
5,469,378 Content addressable memory having match line transistors connected in series and coupled to current sensing circuit 18 1994

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
NETLOGIC MICROSYSTEMS, INC. (35)
7,143,231 Method and apparatus for performing packet classification for policy-based packet routing 8 1999
6,813,680 Method and apparatus for loading comparand data into a content addressable memory system 7 2000
6,801,981 Intra-row configurability of content addressable memory 6 2000
6,799,243 Method and apparatus for detecting a match in an intra-row configurable cam system 8 2000
6,751,701 Method and apparatus for detecting a multiple match in an intra-row configurable CAM system 5 2000
6,560,670 Inter-row configurability of content addressable memory 27 2000
6,542,391 Content addressable memory with configurable class-based storage partition 53 2001
6,944,709 Content addressable memory with block-programmable mask write mode, word width and priority 34 2001
6,934,795 Content addressable memory with programmable word width and programmable priority 37 2001
6,745,280 Content addressable memories having entries stored therein with independently searchable weight fields and methods of operating same 9 2002
6,892,272 Method and apparatus for determining a longest prefix match in a content addressable memory device 8 2002
6,867,989 Auto read content addressable memory cell and array 7 2002
7,117,300 Method and apparatus for restricted search operation in content addressable memory (CAM) devices 5 2002
6,760,242 Content addressable memory (CAM) devices having speed adjustable match line signal repeaters therein 29 2002
6,711,041 Content addressable memory with configurable class-based storage partition 20 2003
6,924,994 Content addressable memory (CAM) devices having scalable multiple match detection circuits therein 2 2003
7,092,311 Content addressable memory (CAM) devices that utilize priority class detectors to identify highest priority matches in multiple CAM arrays and methods of operating same 4 2003
6,839,256 Content addressable memory (CAM) devices having dedicated mask cell sub-arrays therein and methods of operating same 11 2003
6,804,134 Content addressable memory (CAM) devices having CAM array blocks therein that conserve bit line power during staged compare operations 13 2003
6,965,519 Content addressable memory (CAM) devices that utilize dual-capture match line signal repeaters to achieve desired speed/power tradeoff and methods of operating same 7 2003
6,829,153 Content addressable memory (CAM) devices having CAM array blocks therein that perform pipelined and interleaved search, write and read operations and methods of operating same 13 2003
6,775,168 Content addressable memory (CAM) devices having adjustable match line precharge circuits therein 18 2003
6,967,856 Content addressable memory (CAM) devices that utilize segmented match lines and word lines to support pipelined search and write operations and methods of operating same 14 2003
6,831,850 Content addressable memory with configurable class-based storage partition 32 2003
7,272,027 Priority circuit for content addressable memory 1 2004
6,859,378 Multiple match detection logic and gates for content addressable memory (CAM) devices 4 2004
7,050,317 Content addressable memory (CAM) devices that support power saving longest prefix match operations and methods of operating same 9 2004
6,879,532 Content addressable and random access memory devices having high-speed sense amplifiers therein with low power consumption requirements 5 2004
7,230,840 Content addressable memory with configurable class-based storage partition 2 2004
7,246,198 Content addressable memory with programmable word width and programmable priority 9 2005
7,301,850 Content addressable memory (CAM) devices having bidirectional interface circuits therein that support passing word line and match signals on global word lines 2 2006
7,095,641 Content addressable memory (CAM) devices having priority class detectors therein that perform local encoding of match line signals 1 2006
7,822,916 Integrated circuit search engine devices having priority sequencer circuits therein that sequentially encode multiple match signals 0 2006
7,944,724 Ternary content addressable memory having reduced leakage effects 1 2009
7,920,397 Memory device having bit line leakage compensation 0 2010
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (4)
6,353,548 Method and data processing system for data lookups 2 2000
6,650,561 High reliability content-addressable memory using shadow content-addressable memory 5 2002
6,834,003 Content addressable memory with PFET passgate SRAM cells 1 2002
6,687,144 High reliability content-addressable memory using shadow content-addressable memory 17 2003
 
CYPRESS SEMICONDUCTOR CORPORATION (3)
6,782,467 Method and apparatus for fast limited core area access and cross-port word size multiplication in synchronous multiport memories 2 2001
7,796,464 Synchronous memory with a shadow-cycle counter 0 2004
8,073,005 Method and apparatus for configuring signal lines according to idle codes 0 2007
 
BROADCOM CORPORATION (2)
6,646,899 Content addressable memory with power reduction technique 2 2001
6,785,152 Content addressable memory with power reduction technique 3 2003
 
OKI SEMICONDUCTOR CO., LTD. (2)
6,388,909 Associative memory for accomplishing longest coincidence data detection by two comparing operations 5 2001
6,618,280 Associative memory for accomplishing longest coincidence data detection by two comparing operations 4 2002
 
TELSIMA CORPORATION (2)
6,574,701 Technique for updating a content addressable memory 4 2001
6,532,516 Technique for updating a content addressable memory 5 2001
 
INTEL CORPORATION (1)
7,013,367 Caching associative memory using non-overlapping data 1 2003
 
RPX CORPORATION (1)
6,505,287 Virtual channel memory access controlling circuit 122 2000
 
STMICROELECTRONICS PVT. LTD. (1)
6,580,628 Associative memory 2 2002
 
TRANSPACIFIC IP I LTD. (1)
6,240,004 Low-voltage content addressable memory cell with a fast tag-compare capability using partially-depleted SOI CMOS dynamic-threshold techniques 9 2000