| 摘要 |
PROBLEM TO BE SOLVED: To perform numerical operation of a plurality of digits at higher speed than ever. SOLUTION: An arithmetic unit 1 for numerical operation of the plurality of digits includes operation processing sections 3a, 3b for adding two numerical data in 16 bits each from the lower digit side in a shared manner. Each operation processing section 3a, 3b includes each arithmetic circuit 4a, 4c for calculating on the assumption of no carry by addition of numerical data on the lower digit side in the other operation processing section 3a, 3b, and each arithmetic circuit 4b, 4d for calculating on the assumption of a carry produced thereby, and a selector for selecting either one calculation result of the arithmetic circuits 4a, 4c and the arithmetic circuits 4b, 4d, based on the carry result of the addition of the numerical data on the lower digit side in the other operation processing section 3a, 3b. COPYRIGHT: (C)2008,JPO&INPIT
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