Data processing system

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United States of America Patent

PATENT NO 4897787
SERIAL NO

07015016

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An instruction is constituted by a plurality of words, minimum necessary information necessary for effective address calculation of an operand is stored in a leading word and a word or words containing an operation specification field (operation words) are arranged to continue the first word. According to this system, the operation word can be decoded concurrently with the address calculation of the operand or the operand fetch operation. Therefore, there is no need to secure a time exclusively for decoding the operation word and the execution speed of the instruction requiring the operand can be improved.

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Patent Owner(s)

  • HITACHI, LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kawasaki, Ikuya Kodaira, JP 45 1236
Kurakazu, Keiichi Tachikawa, JP 40 1010
Maejima, Hideo Hitachi, JP 73 1750

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