Method and arrangement of determining approximated reciprocal of

Details Method and arrangement of determining approximated reciprocal of Method and arrangement of determining approximated reciprocal of

1990-07-11

1992-10-06

Malzahn, David H.

Boots, shoes, and leggings

36471504, G06F 752

Patent

active

051538512

ABSTRACT:
A selector is arranged to choose one of first and second incoming data. The first data is a fraction of a divisor applied from external circuitry, while the second data is a binary normalized first data in the event that the first data is not normalized in terms of a radix of the first data. The data chosen by the selector is stored in a register. A first predetermined number of upper bits (5 bits for example) of a fraction held in the register is checked to see if the fraction is normalized in terms of a radix of the first data. In the event that the fraction of a divisor stored in the register is found to be normalized in terms of a radix of the first data, the amount of shifting necessary to binary normalize the first predetermined number of upper bits of a fraction is determined. The amount of shifting thus detected is used to shift or binary normalize a second predetermined number of upper bits of a fraction stored in the register. The second predetermined number of upper bits thus binary normalized is used to generate an approximated reciprocal of a divisor. On the other hand, in the event that a fraction stored in the register is found to be unnormalized in terms of a radix of the first data, the selector chooses the second data.

REFERENCES:
patent: 3633018 (1972-01-01), Ling
patent: 4586154 (1986-04-01), Berry
patent: 4707798 (1987-11-01), Nakano
patent: 4789956 (1988-12-01), Hildebrandt
patent: 4823301 (1989-04-01), Knierim
patent: 4905178 (1990-02-01), Mor

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