JP6145023B2 - メモリシステムのクロックモード決定 - Google Patents
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Description
共同で所有された米国特許出願番号第11/771,241号、発明の名称『混合タイプのメモリ装置を動作するシステムおよびその方法』(SYSTEM AND METHOD OF OPERATING MEMORY DEVICES OF MIXED TYPE)に開示され、これらの内容は、参照としてここに含まれる。例えば、高速のDRAMメモリは、動作をキャッシュするため使用されることができ、他方で、不揮発性のフラッシュメモリは、低電力の大量データストレージのために使用されることができる。使用されるメモリ装置のタイプに関わらず、各々のメモリ装置は、コマンドで動作するよう個々にアドレス可能であり、シリアルインターフェースおよび制御論理ブロック308が予め決定されたプロトコルによるコマンドを受け取るように構成されるからである。1つの実施例によると、前述のクロックモード構成回路は、シリアルインターフェースおよび制御論理ブロック308内で実行される。
クロックスイッチ回路402および構成可能なデータ入力/出力バッファ404のようなクロックスイッチ回路および構成可能なデータ入力/出力バッファを、前述した方法で自動的に構成する。メモリ装置が、MODEに対応するクロックおよびデータ信号を受け取るように構成されると、任意のステップとして、メモリコントローラは、最後のメモリ装置のPHASEを、デフォルト値からアクティブレベルに切替えるコマンドを発することができる。図8Aを参照すると、メモリ装置のスタートアップもしくはリセット時のPHASEのデフォルト値は、CKIおよびCKI#を通過させるような低論理レベルであることができ、他方、アクティブ値は、PLL706の180度および360度のクロック出力を送るためのVDDであることができる。
Claims (17)
- メモリコントローラと、
前記メモリコントローラに通信可能に結合される少なくとも1つの不揮発性メモリ装置と、を備え、当該不揮発性メモリ装置は、
前記不揮発性メモリ装置がメモリコントローラとインターフェースするよう構成するモード選択信号を提供するよう構成されたモード選択回路と、
第1および第2の入力端子であって、前記第1の入力端子は正のクロック信号を受信するよう構成され、前記第2の入力端子は前記正のクロック信号と同期し且つ前記正のクロック信号に対して相補的な負のクロック信号を受信するよう構成された、第1及び第2の入力端子と、
前記不揮発性メモリ装置にプログラムすべき書き込みデータを含むデータ入力信号を受信するよう構成されたアドレス及びデータに共通のデータ入力端子であって、前記不揮発性メモリ装置が受信すべき前記書き込みデータの同期は、少なくとも前記正のクロック信号によって提供される、データ入力端子と、
前記モード選択信号が第1の論理レベルであることに応答して、前記正のクロック信号と前記負のクロック信号の比較に基づいてバッファされたクロック信号を提供するとともに、前記モード選択信号が第2の論理レベルであることに応答して、前記正のクロック信号と前記負のクロック信号の一方に基づいて前記バッファされたクロック信号を提供するよう構成されたクロック入力バッファと、を含み、
前記不揮発性メモリ装置は、
i)前記モード選択信号が前記第1の論理レベルにあることに応答して高速動作するよう構成され、
ii)前記モード選択信号が前記第2の論理レベルにあることに応答して低速動作するよう構成される、システム。 - 前記不揮発性メモリ装置は、ライトデータ入力信号を受信するよう構成された第3の入力端子及び入力基準電圧信号を受信するよう構成された第4の入力端子を含むデータ入力バッファをさらに含み、
前記データ入力バッファは、前記モード選択信号が第1の論理レベルであることに応答して、前記ライトデータ入力信号と前記入力基準電圧信号の比較に基づいてバッファされたデータ入力信号を提供するとともに、前記モード選択信号が第2の論理レベルであることに応答して、前記入力基準電圧信号とは独立して前記ライトデータ入力信号に基づいて前記バッファされたデータ入力信号を提供する、請求項1に記載のシステム。 - 前記データ入力バッファはさらに、前記データ入力端子に結合された単一の入力を有するバッファ回路を含み、前記データ入力バッファはさらに、前記ライトデータ入力信号と前記入力基準電圧信号の比較を行うコンパレータ回路を含み、前記コンパレータ回路は、モード選択信号が第2の論理レベルにあるときにディスエーブルされ、前記バッファ回路は、モード選択信号が第1の論理レベルにあるときにディスエーブルされる、請求項2に記載のシステム。
- 前記データ入力バッファはさらに、前記データ入力端子に結合された単一の入力を有するバッファ回路を含み、前記データ入力バッファはさらに、前記データ入力バッファのコンパレータ回路の出力および前記バッファ回路の出力の両方に結合されたマルチプレクサ回路を含み、前記コンパレータ回路は前記ライトデータ入力信号と前記入力基準電圧信号の比較を行い、前記コンパレータ回路及び前記マルチプレクサ回路は、前記モード選択信号が第1の論理レベルにあるときに、前記バッファされたデータ入力信号として、前記コンパレータ回路からの信号を提供するよう構成され、かつ前記モード選択信号が第2の論理レベルにあるときに、前記バッファされたデータ入力信号として前記バッファ回路からの信号を提供するよう構成される、請求項2に記載のシステム。
- 前記モード選択回路は、入力基準電圧信号に基づいて前記モード選択信号の状態を決定するよう構成される、請求項2に記載のシステム。
- 前記書き込みデータ入力信号は、ダブルデータレート信号である、請求項2に記載のシステム。
- 前記クロック入力バッファはさらに、前記正のクロック入力端子または前記負のクロック入力端子に結合された単一の入力を有する第1のバッファ回路を含み、前記クロック入力バッファのコンパレータ回路部は、前記モード選択信号が第2の論理レベルにあるときにディスエーブルされ、前記第1のバッファ回路は、前記モード選択信号が第1の論理レベルにあるときにディスエーブルされ、前記クロック入力バッファの前記コンパレータ回路部は前記正のクロック信号と前記負のクロック信号の比較を行うよう構成される、請求項1に記載のシステム。
- 前記クロック入力バッファはさらに、前記正のクロック入力端子または前記負のクロック入力端子に結合された単一の入力を有する第1のバッファ回路を含み、前記クロック入力バッファはさらに、前記クロック入力バッファの前記コンパレータ回路部の出力と結合し、かつ前記第1のバッファ回路の出力と結合された、マルチプレクサ回路を含み、前記クロック入力バッファの前記コンパレータ回路部は前記正のクロック信号と前記負のクロック信号の比較を行うよう構成される、請求項1に記載のシステム。
- 前記クロック入力バッファはさらに、前記正のクロック入力端子に結合された単一の入力を有する第1のバッファ回路と、前記負のクロック入力端子に結合された単一の入力を有する第2のバッファ回路とを含む、請求項1に記載のシステム。
- 前記クロック入力バッファは、前記クロック入力バッファに結合された遅延ロックループを含み、高速動作に関して位相シフトされたバッファされたクロック入力信号を提供する、請求項1に記載のシステム。
- 不揮発性メモリ装置であって、
a)モード選択信号を提供するモード選択回路であって、当該不揮発性メモリ装置は、前記不揮発性メモリ装置がメモリコントローラとインターフェースするよう構成するモード選択信号が第1の論理レベルであると決定されたとき高速動作するように構成され、かつモード選択信号が第2の論理レベルにあると決定されたとき低速動作するように構成される、前記モード選択回路と、
b)正のクロック入力信号を受け取る正のクロック入力端子と、
c)前記正のクロック入力信号と同期し且つ前記正のクロック入力信号に対して相補的な負のクロック入力信号を受け取る負のクロック入力端子と、
d)前記不揮発性メモリ装置にプログラムすべき書き込みデータを含むデータ入力信号を受信するよう構成されたアドレス及びデータに共通のデータ入力端子であって、前記不揮発性メモリ装置が受信すべき前記書き込みデータの同期は、少なくとも前記正のクロック信号によって提供される、データ入力端子と、
e)前記正のクロック入力端子と前記負のクロック入力端子とに結合されたコンパレータ回路を含むクロック入力バッファとを含み、
i)前記モード選択信号が第1の論理レベルにあるとき、前記コンパレータ回路は、バッファされたクロック入力信号の提供において、前記正のクロック入力信号を前記負のクロック入力信号と比較するよう構成され、
ii)前記モード選択信号が第2の論理レベルにあるとき、前記クロック入力バッファは、前記正のクロック入力信号または前記負のクロック入力信号に基づいて前記バッファされたクロック入力信号を提供するよう構成される、不揮発性メモリ装置。 - 前記クロック入力バッファはさらに、前記正のクロック入力端子または前記負のクロック入力端子に結合された単一の入力を有する第1のバッファ回路を含む、請求項11に記載の不揮発性メモリ装置。
- 前記クロック入力バッファは、前記コンパレータに結合された遅延ロックループを含み、高速動作に関して位相シフトされたバッファされたクロック入力信号を提供する、請求項11に記載の不揮発性メモリ装置。
- 前記正のクロック入力信号および前記負のクロック入力信号は、高速動作モードのSSTL信号である、請求項11に記載の不揮発性メモリ装置。
- 前記正のクロック入力信号および前記負のクロック入力信号は、高速動作モードのHSTL信号である、請求項11に記載の不揮発性メモリ装置。
- 前記正のクロック入力信号および前記負のクロック入力信号の少なくとも1つは、低速動作モードのLVTTL信号である、請求項11に記載の不揮発性メモリ装置。
- 前記正のクロック入力信号および前記負のクロック入力信号の少なくとも1つは、低速動作モードの終端しない低電圧CMOS信号である、請求項11に記載の不揮発性メモリ装置。
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CN (1) | CN101617371B (ja) |
AT (1) | ATE553539T1 (ja) |
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