JP4427574B2 - 連想メモリおよびそれを用いた検索システム - Google Patents
連想メモリおよびそれを用いた検索システム Download PDFInfo
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- JP4427574B2 JP4427574B2 JP2007309856A JP2007309856A JP4427574B2 JP 4427574 B2 JP4427574 B2 JP 4427574B2 JP 2007309856 A JP2007309856 A JP 2007309856A JP 2007309856 A JP2007309856 A JP 2007309856A JP 4427574 B2 JP4427574 B2 JP 4427574B2
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
- G11C11/56—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using storage elements with more than two stable states represented by steps, e.g. of voltage, current, phase, frequency
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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
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Description
検索データに近い参照データのj(jは、1≦j≦kを満たす整数、kは、2以上の整数)回目の検索において、j−1回目までに検索されたj−1個の参照データを複数の参照データから除き、その除いた残りの参照データから検索データに最も近い参照データを検出するための複数の比較電流信号を電圧に変換するとともに、その変換した電圧を増幅してj番目の出力信号を生成する信号生成動作をk回実行する。
Claims (3)
- 予め記憶された複数の参照データの各々と入力された検索データとの比較を並列に実行し、その比較結果を示す複数の比較電流信号を生成するメモリアレイ部と、
前記検索データに近い参照データのj(jは、1<j≦kを満たす整数、kは、2以上の整数)回目の検索において、j−1回目までに検索されたj−1個の参照データを前記複数の参照データから除き、その除いた残りの参照データから前記検索データに最も近い参照データを検出するための複数の比較電流信号を電圧に変換するとともに、その変換した電圧を増幅してj番目の出力信号を生成する信号生成動作を前記k回実行する出力回路とを備え、
前記出力回路は、
前記j回目の信号生成動作において、前記メモリアレイ部によって生成された複数の比較電流信号を複数の電圧に変換し、j−1番目のフィードバック信号に基づいて、前記複数の電圧から前記検索データにj−1番目に近い参照データを示す電圧を除いて残りの電圧を検出し、その検出した残りの電圧を前記検索データにj番目に近い参照データを示す第1の電圧と前記検索データに遠い参照データを示す第2の電圧とに増幅する第1の増幅回路と、
前記j回目の信号生成動作において、前記第1の増幅回路から出力された第1および第2の電圧をさらに増幅して前記j番目の出力信号を生成する第2の増幅回路と、
前記j回目の信号生成動作において、前記第2の増幅回路から出力されたj−1番目の出力信号に基づいて前記j−1番目のフィードバック信号を生成し、その生成したj−1番目のフィードバック信号を前記第1の増幅回路へ出力するフィードバック回路とを含む、連想メモリ。 - 前記第1の増幅回路は、前記j−1番目のフィードバック信号に基づいて、前記検索データにj−1番目に近い参照データを示す比較電流信号を無効にすることによって前記複数の電圧から前記検索データにj−1番目に近い参照データを示す電圧を除いて残りの電圧を検出する、請求項1に記載の連想メモリ。
- 前記第1の増幅回路は、前記複数の電圧から前記検索データにj−1番目に近い参照データを示す電圧を除いて残りの電圧を検出すると、前記残りの電圧を前記第1の電圧と前記第2の電圧とに分離するためのしきい値を設定し、前記残りの電圧の各々を前記しきい値と比較して前記残りの電圧を前記第1の電圧と前記第2の電圧とに増幅する、請求項1に記載の連想メモリ。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2007309856A JP4427574B2 (ja) | 2007-11-30 | 2007-11-30 | 連想メモリおよびそれを用いた検索システム |
US12/128,126 US7957171B2 (en) | 2007-11-30 | 2008-05-28 | Associative memory and searching system using the same |
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JP2007309856A JP4427574B2 (ja) | 2007-11-30 | 2007-11-30 | 連想メモリおよびそれを用いた検索システム |
Publications (2)
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JP2009134810A JP2009134810A (ja) | 2009-06-18 |
JP4427574B2 true JP4427574B2 (ja) | 2010-03-10 |
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JP (1) | JP4427574B2 (ja) |
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JP5224601B2 (ja) | 2009-10-01 | 2013-07-03 | 国立大学法人広島大学 | 連想メモリ |
RU2469425C2 (ru) * | 2010-05-17 | 2012-12-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Юго-Западный государственный университет" (ЮЗГУ) | Ассоциативная запоминающая матрица маскированного поиска вхождений |
US8976691B2 (en) | 2010-10-06 | 2015-03-10 | Blackbird Technology Holdings, Inc. | Method and apparatus for adaptive searching of distributed datasets |
US9042353B2 (en) | 2010-10-06 | 2015-05-26 | Blackbird Technology Holdings, Inc. | Method and apparatus for low-power, long-range networking |
US8718551B2 (en) | 2010-10-12 | 2014-05-06 | Blackbird Technology Holdings, Inc. | Method and apparatus for a multi-band, multi-mode smartcard |
US8622312B2 (en) | 2010-11-16 | 2014-01-07 | Blackbird Technology Holdings, Inc. | Method and apparatus for interfacing with a smartcard |
WO2012100145A1 (en) | 2011-01-21 | 2012-07-26 | Blackbird Technology Holdings, Inc. | Method and apparatus for memory management |
US8909865B2 (en) | 2011-02-15 | 2014-12-09 | Blackbird Technology Holdings, Inc. | Method and apparatus for plug and play, networkable ISO 18000-7 connectivity |
US9154392B2 (en) | 2011-03-02 | 2015-10-06 | Blackbird Technology Holdings, Inc. | Method and apparatus for power autoscaling in a resource-constrained network |
US8929961B2 (en) | 2011-07-15 | 2015-01-06 | Blackbird Technology Holdings, Inc. | Protective case for adding wireless functionality to a handheld electronic device |
JP5800422B2 (ja) * | 2011-11-07 | 2015-10-28 | 国立大学法人広島大学 | 連想メモリ |
RU2549525C2 (ru) * | 2013-07-15 | 2015-04-27 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Юго-Западный государственный университет" (ЮЗ ГУ) | Способ и устройство поиска составного образца в последовательности |
FR3065826B1 (fr) * | 2017-04-28 | 2024-03-15 | Patrick Pirim | Procede et dispositif associe automatises aptes a memoriser, rappeler et, de maniere non volatile des associations de messages versus labels et vice versa, avec un maximum de vraisemblance |
TWI843434B (zh) * | 2023-02-09 | 2024-05-21 | 旺宏電子股份有限公司 | 記憶體裝置及其記憶體內搜尋方法 |
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JP3731046B2 (ja) | 2001-01-19 | 2006-01-05 | 国立大学法人広島大学 | 半導体連想メモリ |
KR100399435B1 (ko) * | 2001-02-27 | 2003-09-29 | 주식회사 하이닉스반도체 | 반도체 메모리 장치와 그의 리페어 해석 방법 |
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WO2008105157A1 (ja) * | 2007-02-27 | 2008-09-04 | Hiroshima University | 増幅回路および連想メモリ |
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US7957171B2 (en) | 2011-06-07 |
JP2009134810A (ja) | 2009-06-18 |
US20090141531A1 (en) | 2009-06-04 |
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