USRE40932E1 - Content addressable memory (CAM) devices that perform pipelined multi-cycle look-up operations using cam sub-arrays and longest match detection - Google Patents
Content addressable memory (CAM) devices that perform pipelined multi-cycle look-up operations using cam sub-arrays and longest match detection Download PDFInfo
- Publication number
- USRE40932E1 USRE40932E1 US10/285,031 US28503102A USRE40932E US RE40932 E1 USRE40932 E1 US RE40932E1 US 28503102 A US28503102 A US 28503102A US RE40932 E USRE40932 E US RE40932E
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- United States
- Prior art keywords
- cam
- array
- match
- key
- sub
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C15/00—Digital stores in which information comprising one or more characteristic parts is written into the store and in which information is read-out by searching for one or more of these characteristic parts, i.e. associative or content-addressed stores
- G11C15/04—Digital stores in which information comprising one or more characteristic parts is written into the store and in which information is read-out by searching for one or more of these characteristic parts, i.e. associative or content-addressed stores using semiconductor elements
Abstract
Description
TABLE 1 | |||||
| |||||
CAM | |||||
422 | |
| |||
CAM | |||||
421 | | CAM | 423 | |
440 |
Processes | The | Processes | The | Completes | |
Clock | The First | Second | The Third | Fourth | Process |
Cycle | Key of: | Key of: | Key of: | Key of: | for: |
T | ID1 | — | — | — | — |
T + 1 | ID2 | ID1 | — | — | — |
T + 2 | ID3 | ID2 | ID1 | — | — |
T + 3 | ID4 | ID3 | ID2 | ID1 | — |
T + 4 | ID5 | ID4 | ID3 | ID2 | ID1 |
T + 5 | ID6 | ID5 | ID4 | ID3 | ID2 |
T + 6 | ID7 | ID6 | ID5 | ID4 | ID3 |
T + 7 | ID8 | ID7 | ID6 | ID5 | ID4 |
T + 8 | ID9 | ID8 | ID7 | ID6 | ID5 |
T + 9 | ID10 | ID9 | ID8 | ID7 | ID6 |
TABLE 2 | |||||
| |||||
CAM | |||||
422 | | | |||
CAM | |||||
421 | | CAM | 423 | | 440 |
Processes | The | Processes | The | Completes | |
Clock | The First | Second | The Third | Fourth | Process |
Cycle | Key of: | Key of: | Key of: | Key of: | for: |
T | ID1 | ID1 | — | — | — |
T + 1 | ID2 | ID2 | ID1 | ID1 | — |
T + 2 | ID3 | ID3 | ID2 | ID2 | ID1 |
T + 3 | ID4 | ID4 | ID3 | ID3 | ID2 |
T + 4 | ID5 | ID5 | ID4 | ID4 | ID3 |
T + 5 | ID6 | ID6 | ID5 | ID5 | ID4 |
T + 6 | ID7 | ID7 | ID6 | ID6 | ID5 |
T + 7 | ID8 | ID8 | ID7 | ID7 | ID6 |
T + 8 | ID9 | ID9 | ID8 | ID8 | ID7 |
T + 9 | ID10 | ID10 | ID9 | ID9 | ID8 |
The latency of
Claims (53)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/285,031 USRE40932E1 (en) | 1999-07-27 | 2002-10-31 | Content addressable memory (CAM) devices that perform pipelined multi-cycle look-up operations using cam sub-arrays and longest match detection |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/361,680 US6370613B1 (en) | 1999-07-27 | 1999-07-27 | Content addressable memory with longest match detect |
US10/285,031 USRE40932E1 (en) | 1999-07-27 | 2002-10-31 | Content addressable memory (CAM) devices that perform pipelined multi-cycle look-up operations using cam sub-arrays and longest match detection |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/361,680 Reissue US6370613B1 (en) | 1998-01-23 | 1999-07-27 | Content addressable memory with longest match detect |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE40932E1 true USRE40932E1 (en) | 2009-10-06 |
Family
ID=23423037
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/361,680 Ceased US6370613B1 (en) | 1998-01-23 | 1999-07-27 | Content addressable memory with longest match detect |
US10/285,031 Expired - Lifetime USRE40932E1 (en) | 1999-07-27 | 2002-10-31 | Content addressable memory (CAM) devices that perform pipelined multi-cycle look-up operations using cam sub-arrays and longest match detection |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/361,680 Ceased US6370613B1 (en) | 1998-01-23 | 1999-07-27 | Content addressable memory with longest match detect |
Country Status (1)
Country | Link |
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US (2) | US6370613B1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7953721B1 (en) | 2006-11-27 | 2011-05-31 | Netlogic Microsystems, Inc. | Integrated search engine devices that support database key dumping and methods of operating same |
US8086641B1 (en) | 2006-11-27 | 2011-12-27 | Netlogic Microsystems, Inc. | Integrated search engine devices that utilize SPM-linked bit maps to reduce handle memory duplication and methods of operating same |
US8886677B1 (en) | 2004-07-23 | 2014-11-11 | Netlogic Microsystems, Inc. | Integrated search engine devices that support LPM search operations using span prefix masks that encode key prefix length |
US9063840B1 (en) | 2009-08-21 | 2015-06-23 | Broadcom Corporation | Multiple match detection for multiple flows in a content addressable memory |
US11244724B2 (en) | 2019-10-21 | 2022-02-08 | Realtek Semiconductor Corporation | Content addressable memory device |
Families Citing this family (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3166700B2 (en) * | 1998-03-12 | 2001-05-14 | 日本電気株式会社 | Router and longest match search device |
US6631419B1 (en) * | 1999-09-22 | 2003-10-07 | Juniper Networks, Inc. | Method and apparatus for high-speed longest prefix and masked prefix table search |
US6934795B2 (en) * | 1999-09-23 | 2005-08-23 | Netlogic Microsystems, Inc. | Content addressable memory with programmable word width and programmable priority |
US6801981B1 (en) * | 2000-06-14 | 2004-10-05 | Netlogic Microsystems, Inc. | Intra-row configurability of content addressable memory |
US6813680B1 (en) * | 2000-06-14 | 2004-11-02 | Netlogic Microsystems, Inc. | Method and apparatus for loading comparand data into a content addressable memory system |
US6799243B1 (en) * | 2000-06-14 | 2004-09-28 | Netlogic Microsystems, Inc. | Method and apparatus for detecting a match in an intra-row configurable cam system |
US6795892B1 (en) * | 2000-06-14 | 2004-09-21 | Netlogic Microsystems, Inc. | Method and apparatus for determining a match address in an intra-row configurable cam device |
US6751701B1 (en) * | 2000-06-14 | 2004-06-15 | Netlogic Microsystems, Inc. | Method and apparatus for detecting a multiple match in an intra-row configurable CAM system |
US6944709B2 (en) * | 1999-09-23 | 2005-09-13 | Netlogic Microsystems, Inc. | Content addressable memory with block-programmable mask write mode, word width and priority |
US6505271B1 (en) * | 1999-11-12 | 2003-01-07 | Integrated Device Technology, Inc. | Increasing priority encoder speed using the most significant bit of a priority address |
JP2004526272A (en) * | 2001-02-01 | 2004-08-26 | メンコール インク. | Memory system that detects the longest match |
US6910097B1 (en) * | 2001-04-09 | 2005-06-21 | Netlogic Microsystems, Inc. | Classless interdomain routing using binary content addressable memory |
US6959358B2 (en) * | 2001-07-06 | 2005-10-25 | Micron Technology, Inc. | Distributed content addressable memory |
US6707694B2 (en) | 2001-07-06 | 2004-03-16 | Micron Technology, Inc. | Multi-match detection circuit for use with content-addressable memories |
TW569090B (en) * | 2001-07-17 | 2004-01-01 | Taiwan Semiconductor Mfg | Priority address encoder and method of the same |
US6665202B2 (en) | 2001-09-25 | 2003-12-16 | Integrated Device Technology, Inc. | Content addressable memory (CAM) devices that can identify highest priority matches in non-sectored CAM arrays and methods of operating same |
US7301961B1 (en) | 2001-12-27 | 2007-11-27 | Cypress Semiconductor Corportion | Method and apparatus for configuring signal lines according to idle codes |
US6700809B1 (en) | 2002-02-01 | 2004-03-02 | Netlogic Microsystems, Inc. | Entry relocation in a content addressable memory device |
US7382637B1 (en) | 2002-02-01 | 2008-06-03 | Netlogic Microsystems, Inc. | Block-writable content addressable memory device |
US6697276B1 (en) | 2002-02-01 | 2004-02-24 | Netlogic Microsystems, Inc. | Content addressable memory device |
US6934796B1 (en) | 2002-02-01 | 2005-08-23 | Netlogic Microsystems, Inc. | Content addressable memory with hashing function |
US6839256B1 (en) | 2002-03-15 | 2005-01-04 | Integrated Device Technology, Inc. | Content addressable memory (CAM) devices having dedicated mask cell sub-arrays therein and methods of operating same |
US6867991B1 (en) | 2003-07-03 | 2005-03-15 | Integrated Device Technology, Inc. | Content addressable memory devices with virtual partitioning and methods of operating the same |
US6760242B1 (en) | 2002-04-10 | 2004-07-06 | Integrated Device Technology, Inc. | Content addressable memory (CAM) devices having speed adjustable match line signal repeaters therein |
US6972978B1 (en) | 2002-03-15 | 2005-12-06 | Integrated Device Technology, Inc. | Content addressable memory (CAM) devices with block select and pipelined virtual sector look-up control and methods of operating same |
US6965519B1 (en) | 2003-06-18 | 2005-11-15 | Integrated Device Technology, Inc. | Content addressable memory (CAM) devices that utilize dual-capture match line signal repeaters to achieve desired speed/power tradeoff and methods of operating same |
US7050317B1 (en) | 2002-03-15 | 2006-05-23 | Integrated Device Technology, Inc. | Content addressable memory (CAM) devices that support power saving longest prefix match operations and methods of operating same |
US6879532B1 (en) | 2002-04-10 | 2005-04-12 | Integrated Device Technology, Inc. | Content addressable and random access memory devices having high-speed sense amplifiers therein with low power consumption requirements |
US6967856B1 (en) | 2002-04-10 | 2005-11-22 | Integrated Device Technology, Inc. | 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 |
US8737816B2 (en) * | 2002-08-07 | 2014-05-27 | Hollinbeck Mgmt. Gmbh, Llc | System for selecting video tracks during playback of a media production |
US20040078536A1 (en) * | 2002-10-22 | 2004-04-22 | Tai-Ming Chen | Authentication mechanism integrated with random access memory and method of use |
WO2005093759A1 (en) * | 2004-03-15 | 2005-10-06 | Thomson Licensing | Technique for efficient video re-sampling |
US7099170B1 (en) | 2004-09-14 | 2006-08-29 | Netlogic Microsystems, Inc. | Reduced turn-on current content addressable memory (CAM) device and method |
US7149101B1 (en) | 2004-12-15 | 2006-12-12 | Netlogic Microsystems, Inc. | Method and apparatus for smoothing current transients in a content addressable memory (CAM) device with dummy searches |
US7339810B1 (en) | 2005-03-24 | 2008-03-04 | Netlogic Microsystems, Inc. | Device and method for ensuring current consumption in search engine system |
US7447052B1 (en) | 2005-08-04 | 2008-11-04 | Netlogic Microsystems, Inc. | Method and device for limiting current rate changes in block selectable search engine |
US8335780B2 (en) * | 2008-03-11 | 2012-12-18 | James Madison Kelley | Scalable high speed relational processor for databases and networks |
US7944724B2 (en) | 2009-04-28 | 2011-05-17 | Netlogic Microsystems, Inc. | Ternary content addressable memory having reduced leakage effects |
US7920397B1 (en) | 2010-04-30 | 2011-04-05 | Netlogic Microsystems, Inc. | Memory device having bit line leakage compensation |
CN103440881B (en) * | 2013-08-12 | 2016-03-16 | 平湖凌云信息科技有限公司 | A kind of content addressable memory system, addressing method and device |
US10991414B2 (en) * | 2019-04-12 | 2021-04-27 | Western Digital Technologies, Inc. | Granular refresh rate control for memory devices based on bit position |
Citations (13)
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US6191970B1 (en) | 1999-09-09 | 2001-02-20 | Netlogic Microsystems, Inc. | Selective match line discharging in a partitioned content addressable memory array |
US6219748B1 (en) | 1998-05-11 | 2001-04-17 | Netlogic Microsystems, Inc. | Method and apparatus for implementing a learn instruction in a content addressable memory device |
US6237061B1 (en) | 1999-01-05 | 2001-05-22 | Netlogic Microsystems, Inc. | Method for longest prefix matching in a content addressable memory |
US6240485B1 (en) | 1998-05-11 | 2001-05-29 | Netlogic Microsystems, Inc. | Method and apparatus for implementing a learn instruction in a depth cascaded content addressable memory system |
US6243281B1 (en) | 2000-06-14 | 2001-06-05 | Netlogic Microsystems, Inc. | Method and apparatus for accessing a segment of CAM cells in an intra-row configurable CAM system |
US6243280B1 (en) | 1999-09-09 | 2001-06-05 | Netlogic Microsystems, Inc. | Selective match line pre-charging in a partitioned content addressable memory array |
US6246601B1 (en) | 2000-06-14 | 2001-06-12 | Netlogic Microsystems, Inc. | Method and apparatus for using an inter-row configurable content addressable memory |
US6252789B1 (en) | 2000-06-14 | 2001-06-26 | Netlogic Microsystems, Inc. | Inter-row configurability of content addressable memory |
US6324087B1 (en) | 2000-06-08 | 2001-11-27 | Netlogic Microsystems, Inc. | Method and apparatus for partitioning a content addressable memory device |
US6430074B1 (en) | 1999-09-09 | 2002-08-06 | Netlogic Mircosystems, Inc. | Selective look-ahead match line pre-charging in a partitioned content addressable memory array |
US6499081B1 (en) | 1999-02-23 | 2002-12-24 | Netlogic Microsystems, Inc. | Method and apparatus for determining a longest prefix match in a segmented content addressable memory device |
US6552920B2 (en) * | 2001-06-27 | 2003-04-22 | International Business Machines Corporation | Saving content addressable memory power through conditional comparisons |
US6760242B1 (en) * | 2002-04-10 | 2004-07-06 | Integrated Device Technology, Inc. | Content addressable memory (CAM) devices having speed adjustable match line signal repeaters therein |
-
1999
- 1999-07-27 US US09/361,680 patent/US6370613B1/en not_active Ceased
-
2002
- 2002-10-31 US US10/285,031 patent/USRE40932E1/en not_active Expired - Lifetime
Patent Citations (14)
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US6240485B1 (en) | 1998-05-11 | 2001-05-29 | Netlogic Microsystems, Inc. | Method and apparatus for implementing a learn instruction in a depth cascaded content addressable memory system |
US6219748B1 (en) | 1998-05-11 | 2001-04-17 | Netlogic Microsystems, Inc. | Method and apparatus for implementing a learn instruction in a content addressable memory device |
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US6499081B1 (en) | 1999-02-23 | 2002-12-24 | Netlogic Microsystems, Inc. | Method and apparatus for determining a longest prefix match in a segmented content addressable memory device |
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US6191970B1 (en) | 1999-09-09 | 2001-02-20 | Netlogic Microsystems, Inc. | Selective match line discharging in a partitioned content addressable memory array |
US6430074B1 (en) | 1999-09-09 | 2002-08-06 | Netlogic Mircosystems, Inc. | Selective look-ahead match line pre-charging in a partitioned content addressable memory array |
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US6243281B1 (en) | 2000-06-14 | 2001-06-05 | Netlogic Microsystems, Inc. | Method and apparatus for accessing a segment of CAM cells in an intra-row configurable CAM system |
US6246601B1 (en) | 2000-06-14 | 2001-06-12 | Netlogic Microsystems, Inc. | Method and apparatus for using an inter-row configurable content addressable memory |
US6252789B1 (en) | 2000-06-14 | 2001-06-26 | Netlogic Microsystems, Inc. | Inter-row configurability of content addressable memory |
US6552920B2 (en) * | 2001-06-27 | 2003-04-22 | International Business Machines Corporation | Saving content addressable memory power through conditional comparisons |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8886677B1 (en) | 2004-07-23 | 2014-11-11 | Netlogic Microsystems, Inc. | Integrated search engine devices that support LPM search operations using span prefix masks that encode key prefix length |
US7953721B1 (en) | 2006-11-27 | 2011-05-31 | Netlogic Microsystems, Inc. | Integrated search engine devices that support database key dumping and methods of operating same |
US8086641B1 (en) | 2006-11-27 | 2011-12-27 | Netlogic Microsystems, Inc. | Integrated search engine devices that utilize SPM-linked bit maps to reduce handle memory duplication and methods of operating same |
US9063840B1 (en) | 2009-08-21 | 2015-06-23 | Broadcom Corporation | Multiple match detection for multiple flows in a content addressable memory |
US11244724B2 (en) | 2019-10-21 | 2022-02-08 | Realtek Semiconductor Corporation | Content addressable memory device |
Also Published As
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US6370613B1 (en) | 2002-04-09 |
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