JP2007188379A - エラー訂正方法 - Google Patents
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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
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Abstract
【解決手段】パイプライン動作を行うCPUにおいて、エラーを検出すると、このエラー以前の正しく実行された「命令N」の実行完了状態を保持する遅延レジスタファイル2007よりレジスタファイルの内容を復帰し、「命令N」の次命令である「命令N+1」から命令を再実行するリトライ制御を行うエラー訂正方法であって、CPU内にある任意のフリップフロップのパリティーチェック結果を集約してエラーを検出する。これにより、エラーにより誤動作する可能性がある命令範囲より以前の命令実行完了状態に復帰させ、エラーにより誤動作した可能性がある命令範囲の先頭から命令をリトライする。
【選択図】図2
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Claims (5)
- パイプライン動作を行うCPUにおいて、エラーを検出すると、このエラー以前の正しく実行された「命令N」の実行完了状態を保持する遅延レジスタファイルよりレジスタファイルの内容を復帰し、前記「命令N」の次命令である「命令N+1」から命令を再実行するリトライ制御を行うエラー訂正方法であって、
前記CPU内にある任意のフリップフロップのパリティーチェック結果を集約して前記エラーを検出すること、を特徴とするエラー訂正方法。 - 請求項1に記載のエラー訂正方法において、
前記「命令N+1」は、前記エラーが発生したタイミングにて実行中である少なくとも一つ以上の命令の内で最初に前記CPUに解読された命令であること、を特徴とするエラー訂正方法。 - 請求項1に記載のエラー訂正方法において、
前記リトライ制御を行うリトライ制御部へ入力するCPU信号は、前記CPU信号をエラー検出信号のレイテンシ分遅延させたものをエラー検出信号で無効化し、
前記エラー検出信号の出力ディレイは前記CPU信号の出力ディレイの最小値以下になるようにディレイが調整されていること、を特徴とするエラー訂正方法。 - パイプライン動作を行うCPUにおいて、エラーを検出すると、このエラー以前の正しく実行された「命令N」の実行完了状態を保持する遅延レジスタファイルよりレジスタファイルの内容を復帰し、前記「命令N」の次命令である「命令N+1」から命令を再実行するリトライ制御を行うエラー訂正方法であって、
前記エラー発生以降の命令実行に伴うCPUバスライトにエラーがある場合、それを検出して取り消すこと、を特徴とするエラー訂正方法。 - 請求項4に記載のエラー訂正方法において、
前記CPUバスライトまでに、そのCPUバスライトを伴う命令のソースオペランドが前記遅延レジスタファイルに反映されるように、前記ソースオペランドの内容を生成する命令を前記CPUバスライトを伴う命令の前に配置し、
前記遅延レジスタファイルの読み出し値を用いて前記CPUバスライトのエラーを検出し、それを取り消すこと、を特徴とするエラー訂正方法。
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JP2006006921A JP5129450B2 (ja) | 2006-01-16 | 2006-01-16 | 情報処理装置 |
US11/623,441 US8095825B2 (en) | 2006-01-16 | 2007-01-16 | Error correction method with instruction level rollback |
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Cited By (2)
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JP2009169515A (ja) * | 2008-01-11 | 2009-07-30 | Denso Corp | コンピュータシステム及びシステム回復装置 |
JP2011044114A (ja) * | 2009-08-24 | 2011-03-03 | Nec Corp | マイクロプロセッサ及びマイクロプロセッサのデバッグ方法 |
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US20070180317A1 (en) | 2007-08-02 |
US8095825B2 (en) | 2012-01-10 |
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