Arithmetic unit

Details Arithmetic unit Arithmetic unit

2008-01-01

2008-01-01

Nguyen, Ha Tran (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

C708S625000

Reexamination Certificate

active

07315163

ABSTRACT:
In order to correct an overflow of a multiplication result while improving the operation speed, an overflow detection unit detects an overflow based on whether a multiplicand A and a multiplier B are both a negative value with the largest absolute value. A carry-save adder adds together in carry-save addition partial products and −1 (where all bits are 1) as a first correction value to output an intermediate sum and an intermediate carry corresponding to A×B−1. A carry-propagate adder adds together in carry-propagate addition the intermediate sum, the intermediate carry and a second correction value to output the multiplication result. Where there is no overflow, the second correction value becomes 1 to cancel out the first correction value, whereby the operation result is A×B. Where there is an overflow, the second correction value becomes 0, whereby the operation result is A×B−1 in which the overflow is corrected by the first correction value.

REFERENCES:
patent: 5448509 (1995-09-01), Lee et al.
patent: 6148319 (2000-11-01), Ozaki
patent: 6233597 (2001-05-01), Tanoue et al.
patent: 2003/0229659 (2003-12-01), Halahmi et al.
patent: 1-267728 (1989-10-01), None

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