JP5416700B2 - 配置配線システムにおける設計最適化のためのフィラーセル - Google Patents
配置配線システムにおける設計最適化のためのフィラーセル Download PDFInfo
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- G06F30/392—Floor-planning or layout, e.g. partitioning or placement
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F30/30—Circuit design
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- G06F30/398—Design verification or optimisation, e.g. using design rule check [DRC], layout versus schematics [LVS] or finite element methods [FEM]
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Description
図4は、ディジタル集積回路の設計フローの概略図である。高レベルでは、プロセスは、製品アイデアで始まり(ステップ400)、EDA(Electronic Design Automation:電子設計自動化)ソフトウェア設計プロセス(ステップ410)で実現される。設計が終了すると、製造プロセス(ステップ450)及びパッケージ・組み立てプロセス(ステップ460)を経て、最終的に集積回路チップが完成する(結果470)。
フィラーセルを選択、挿入するステップ516について詳細に述べる前に、ここで利用可能とされる所定のフィラーセルのデザインの種類、及び、隣接する回路セルに対してフィラーセルが及ぼす影響について述べる。ここで述べる実施形態では、フィラーセルは、拡散領域、ポリシリコン線、コンタクト、ウェル境界の移動、エッチング停止層境界の移動からなる5種類の構造を備え、これらは隣接する回路セルに影響を及ぼす可能性がある。これらは全て、回路には電気的に接続されていないダミー構造である。
方法の説明に戻る。図10は、フィラーセルを選択及び挿入するステップ516(図5)の一実施形態のフローチャートを示している。ステップ1010において、有効なフィラーセルを使用した強化対象の全ての回路セルを経由するループ処理が開始される。既に述べたように、様々な実施形態において、レイアウトにおける全ての回路セルか、選択されたセルがこのループの対象となる。図10の実施形態では、クリティカルな信号パスにある回路セルのみに対して処理が行われる。
Claims (19)
- 複数のフィラーセルデザインを定義するデータベースと共に使用するための集積回路設計のレイアウト方法であって、
前記集積回路設計のレイアウトは、前記集積回路設計に従って集積回路装置を製造する際に用いられ、
前記レイアウト方法は、前記集積回路設計の第1レイアウトを提供する工程と、フィラーセルを挿入する工程を含み、
前記第1レイアウトは、複数のマスクを規定し、
前記複数のマスクは、製造プロセスにおいて使用された時に、複数の集積回路の特徴を規定し、
前記複数の集積回路の特徴は、相互間に間隙を設けて配置された複数の回路レイアウトセルを規定し、
前記フィラーセルを挿入する工程において、前記間隙の少なくとも一部の所定の間隙の夫々に、前記所定の間隙に隣接する少なくとも1つの前記回路レイアウトセルの性能パラメータに対して所望される影響に基づいて前記データベースから選択された対応するフィラーセルを挿入し、
前記フィラーセルを挿入する工程において、対象回路レイアウトセルに隣接する間隙に第1フィラーセルを挿入し、
前記第1フィラーセルは、前記対象回路レイアウトセル内のNチャネルトランジスタとPチャネルトランジスタの何れか一方の拡散領域と縦方向に並ぶダミー拡散領域を備え、
前記縦方向は、対象となるトランジスタのソース・ドレイン間を電流が流れる方向であることを特徴とするレイアウト方法。 - 前記第1レイアウトにおいて、前記複数の回路レイアウトセルが複数行に亘って配列されており、前記複数行の内の1行において、前記間隙の夫々が、同一行の対応する1対の前記回路レイアウトセルの間に配置されており、
前記フィラーセルを挿入する工程において、前記所定の間隙の両側に隣接する前記回路レイアウトセルの性能パラメータに対して所望される影響に基づいて、前記対応するフィラーセルが選択されることを特徴とする請求項1に記載のレイアウト方法。 - 前記性能パラメータが、トランジスタにおける電子の移動度、チャネルに流れる電流Ion、スイッチング速度、信号パス遅延、リーク、電力の内の何れかであることを特徴とする請求項1に記載のレイアウト方法。
- 前記所望される影響とは、前記性能パラメータを改善することであることを特徴とする請求項1に記載のレイアウト方法。
- 前記所望される影響とは、前記回路レイアウトセルの近隣のレイアウトに対する前記性能パラメータの感度を低下させることであることを特徴とする請求項1に記載のレイアウト方法。
- 前記集積回路装置の製造は、前記集積回路装置のゲートスタック層の上層部にエッチング停止層を形成する工程を含み、
前記フィラーセルを挿入する工程において、対象回路レイアウトセルに隣接する間隙に第2フィラーセルを挿入し、
前記第2フィラーセルは、前記縦方向に対して直交する横方向に延伸するダミーポリシリコン線を備えることを特徴とする請求項1に記載のレイアウト方法。 - 前記フィラーセルを挿入する工程において、対象回路レイアウトセルに隣接する間隙に第3フィラーセルを挿入し、
前記第3フィラーセルは、ダミーコンタクト領域を備えることを特徴とする請求項1に記載のレイアウト方法。 - 対象回路レイアウトセルが、Pチャネルトランジスタの下層部には形成されているがNチャネルトランジスタの下層部には形成されていないNウェルを備え、前記Nウェルが前記縦方向に延伸するウェル境界を有し、
前記フィラーセルを挿入する工程において、前記対象回路レイアウトセルに隣接する間隙に第4フィラーセルを挿入し、
前記第4フィラーセルはNウェル境界を含み、少なくともその一部は、前記対象回路レイアウトセル内の前記Nウェルの前記Nウェル境界と同一線上に並んでいないことを特徴とする請求項1に記載のレイアウト方法。 - 前記集積回路装置の製造は、前記集積回路装置のゲートスタック層の上層部に、前記縦方向に延伸する境界を有するエッチング停止層を形成する工程を含み、
前記フィラーセルを挿入する工程において、対象回路レイアウトセルに隣接する間隙に第5フィラーセルを挿入し、
前記第5フィラーセルはエッチング停止層境界を含み、少なくともその一部は、前記対象回路レイアウトセル内の前記エッチング停止層境界と同一線上に並んでいないことを特徴とする請求項1に記載のレイアウト方法。 - 前記性能パラメータに対して所望される影響には、対象回路レイアウトセル内のCMOS回路のトランジスタにおける電子移動度を改善することが含まれ、
前記第1フィラーセルは、前記対象回路レイアウトセル内のNチャネルトランジスタの拡散領域に合わせて前記縦方向に配列するダミー拡散領域を備える一方で、前記対象回路レイアウトセル内のPチャネルトランジスタの拡散領域と前記縦方向に並ぶ拡散領域を備えていないことを特徴とする請求項1に記載のレイアウト方法。 - 前記性能パラメータに対して所望される影響には、対象回路レイアウトセル内のCMOS回路のトランジスタにおける電子移動度を低下することが含まれ、
前記第1フィラーセルは、前記対象回路レイアウトセル内のPチャネルトランジスタの拡散領域に合わせて前記縦方向に配列するダミー拡散領域を備える一方で、前記対象回路レイアウトセル内のNチャネルトランジスタの拡散領域と前記縦方向に並ぶ拡散領域を備えていないことを特徴とする請求項1に記載のレイアウト方法。 - 前記性能パラメータに対して所望される影響が、少なくとも一部は、応力効果から得られることを特徴とする請求項1に記載のレイアウト方法。
- 前記性能パラメータに対して所望される影響が、少なくとも一部は、光学近接効果から得られることを特徴とする請求項1に記載のレイアウト方法。
- 前記性能パラメータに対して所望される影響が、少なくとも一部は、ウェル近接性効果から得られることを特徴とする請求項1に記載のレイアウト方法。
- 前記対応するフィラーセルの1つのための空間を作るために、前記回路レイアウトセルの特定の1つの位置を移動させる工程を更に備えることを特徴とする請求項1に記載のレイアウト方法。
- 前記特定の回路レイアウトセルの位置を移動させる工程において、位相同形を維持したまま前記特定の回路レイアウトセルの位置を移動することを特徴とする請求項15に記載のレイアウト方法。
- 前記第1レイアウトにおいて、前記複数の回路レイアウトセルは複数行に亘って配列されており、
前記特定の回路レイアウトセルの位置を移動させる工程において、前記特定のレイアウトセルを、同一行内で位相同形を失わずに移動させることを特徴とする請求項15に記載のレイアウト方法。 - 前記第1レイアウトにおいて、前記複数の回路レイアウトセルは複数行に亘って配列されており、
前記特定の回路レイアウトセルの位置を移動させる工程において、前記特定の回路レイアウトセルを、複数のレイアウトセルの隣接する行に移動させることを特徴とする請求項15に記載のレイアウト方法。 - 複数のフィラーセルデザインを定義するデータベースと共に使用するための集積回路設計をレイアウトするシステムであって、
前記集積回路設計のレイアウトは、前記集積回路設計に従って集積回路装置を製造する際に用いられ、
前記システムは、請求項1〜18の何れか1項に記載のレイアウト方法に含まれる複数の工程を各別に実行する複数の手段を有することを特徴とするレイアウトシステム。
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US11/924,738 | 2007-10-26 | ||
US11/924,738 US7895548B2 (en) | 2007-10-26 | 2007-10-26 | Filler cells for design optimization in a place-and-route system |
PCT/US2008/071589 WO2009055113A1 (en) | 2007-10-26 | 2008-07-30 | Filler cells for design optimization in a place-and-route system |
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WO2009055113A1 (en) | 2009-04-30 |
US20130332893A1 (en) | 2013-12-12 |
US20110078639A1 (en) | 2011-03-31 |
CN101681878B (zh) | 2016-01-13 |
TWI476868B (zh) | 2015-03-11 |
US20090113368A1 (en) | 2009-04-30 |
EP2203935A4 (en) | 2012-04-25 |
CN101681878A (zh) | 2010-03-24 |
US8694942B2 (en) | 2014-04-08 |
US7895548B2 (en) | 2011-02-22 |
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