Intel 8087浮動小数点チップの心臓部、加算器
1980年にIntelがリリースした8087浮動小数点コプロセッサの演算性能を支えたのは、69ビットの加算器だった。本記事では、この加算器の回路構造を詳細に解説。マンチェスターキャリーチェーンとキャリースキップ回路による高速化技法、NMOSトランジスタを前提としたプリチャージ方式、そして乗算・除算・平方根演算を実現する周辺回路との連携について、リバースエンジニアリングされた回路図やダイ写真とともに紹介する。
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