JP4280239B2 - 半導体記憶装置 - Google Patents
半導体記憶装置 Download PDFInfo
- Publication number
- JP4280239B2 JP4280239B2 JP2005014677A JP2005014677A JP4280239B2 JP 4280239 B2 JP4280239 B2 JP 4280239B2 JP 2005014677 A JP2005014677 A JP 2005014677A JP 2005014677 A JP2005014677 A JP 2005014677A JP 4280239 B2 JP4280239 B2 JP 4280239B2
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- Prior art keywords
- signal
- refresh
- circuit
- request signal
- control circuit
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Description
11 コマンド制御回路
12 REF(リフレッシュ)制御回路
13 REF−ACT(アクティブ)比較回路
14 コア制御回路
42 パルス幅拡張回路
43 REF−ACT比較回路
44 コア制御回路
72 REF制御回路
73 REF−ACT比較回路
74 パルス幅拡張回路
Claims (4)
- セルフリフレッシュ機能を有する半導体記憶装置において、
コマンドまたはアドレスを構成する信号の変化を検出して検出信号を出力する検出回路と、
セルフリフレッシュを要求するリフレッシュ要求信号を生成するリフレッシュ制御回路であり、
アクセス時間を試験するテストモード時には、前記検出信号をリフレッシュ要求信号として出力し、
通常動作時には、内部で発生する内部リフレッシュ要求信号をリフレッシュ要求信号として出力する
リフレッシュ制御回路と、
前記コマンドまたはアドレスを構成する信号をデコード処理して、前記コマンドまたはアドレスを構成する信号に対応するアクセスを要求するアクティブ要求信号を出力するコマンド制御回路と、
前記リフレッシュ要求信号に基づくセルフリフレッシュ動作が終了したことに応答して、前記アクティブ要求信号に基づくアクセスを指示するコア制御回路と、
を有することを特徴とする半導体記憶装置。 - 前記半導体記憶装置は更に、
通常動作時において、前記検出信号の発生と前記内部リフレッシュ要求信号の発生との何れが早いかを比較して、回路動作を選択する信号を生成する比較回路を有すること
を特徴とする請求項1記載の半導体記憶装置。 - 通常動作時に、前記検出信号が出力されてから、前記コマンドまたはアドレスを構成する信号がデコード処理されるまでの間は、前記コア制御回路が前記内部リフレッシュ要求信号に基づくセルフリフレッシュ動作を実行しないようにする信号を生成する回路を有すること
を特徴とする請求項1または2記載の半導体記憶装置。 - 前記コア制御回路は、前記セルフリフレッシュ動作が終了したことを示すビジー信号を前記比較回路に出力し、
前記比較回路は、前記ビジー信号に基づいて、前記アクセスを選択する信号を前記コア制御回路に出力すること
を特徴とする請求項2または3記載の半導体記憶装置。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005014677A JP4280239B2 (ja) | 2005-01-21 | 2005-01-21 | 半導体記憶装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005014677A JP4280239B2 (ja) | 2005-01-21 | 2005-01-21 | 半導体記憶装置 |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2000054882A Division JP3778417B2 (ja) | 2000-02-29 | 2000-02-29 | 半導体記憶装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2005108434A JP2005108434A (ja) | 2005-04-21 |
JP4280239B2 true JP4280239B2 (ja) | 2009-06-17 |
Family
ID=34545461
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2005014677A Expired - Fee Related JP4280239B2 (ja) | 2005-01-21 | 2005-01-21 | 半導体記憶装置 |
Country Status (1)
Country | Link |
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JP (1) | JP4280239B2 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7955010B2 (en) | 2005-11-09 | 2011-06-07 | Panasonic Corporation | Image pickup apparatus and image pickup system |
US8126322B2 (en) | 2009-03-13 | 2012-02-28 | Panasonic Corporation | Interchangeable lens, camera body, and camera system |
US8488050B2 (en) | 2008-04-21 | 2013-07-16 | Panasonic Corporation | Camera body, and camera system |
US8767119B2 (en) | 2009-03-13 | 2014-07-01 | Panasonic Corporation | Interchangeable lens, camera body, and camera system |
-
2005
- 2005-01-21 JP JP2005014677A patent/JP4280239B2/ja not_active Expired - Fee Related
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7955010B2 (en) | 2005-11-09 | 2011-06-07 | Panasonic Corporation | Image pickup apparatus and image pickup system |
US8162550B2 (en) | 2005-11-09 | 2012-04-24 | Panasonic Corporation | Image pickup apparatus and image pickup system |
US8408824B2 (en) | 2005-11-09 | 2013-04-02 | Panasonic Corporation | Image pickup apparatus and image pickup system |
US8488050B2 (en) | 2008-04-21 | 2013-07-16 | Panasonic Corporation | Camera body, and camera system |
US8724012B2 (en) | 2008-04-21 | 2014-05-13 | Panasonic Corporation | Camera body and camera system using driving method information indicating capability of controlling focus lens |
US8126322B2 (en) | 2009-03-13 | 2012-02-28 | Panasonic Corporation | Interchangeable lens, camera body, and camera system |
US8767119B2 (en) | 2009-03-13 | 2014-07-01 | Panasonic Corporation | Interchangeable lens, camera body, and camera system |
Also Published As
Publication number | Publication date |
---|---|
JP2005108434A (ja) | 2005-04-21 |
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