Reciprocal arithmetic circuit with ROM table

Details Reciprocal arithmetic circuit with ROM table Reciprocal arithmetic circuit with ROM table

1989-11-30

1991-04-30

Shaw, Dale M.

Boots, shoes, and leggings

G06F 752

Patent

active

050124382

ABSTRACT:
A reciprocal arithmetic circuit for deriving the reciprocal of a divisor A includes a ROM table for converting upper-bit data AH supplied as an address to the approximation of the reciprocal 1/AH.sup.2 of the square thereof and outputting the same, a subtracter circuit for deriving a difference AH-AL between the upper-bit data AH and the lower-bit data AL of the divisor A, and a multiplier circuit for receiving an output 1/AH.sup.2 of the read only memory (ROM) table and an output AH-AL of the subtracter circuit and deriving the product 1/AH.sup.2. (AH-AL) thereof to make the output of the ROM table more nearly equal to the reciprocal 1/A of the divisor A.

REFERENCES:
patent: 3633018 (1972-01-01), Ling
patent: 3648038 (1972-03-01), Sierra
patent: 3777132 (1973-12-01), Bennett, Jr.
patent: 3917935 (1975-11-01), Lazecki
patent: 4718032 (1988-01-01), Irukulla et al.
patent: 4823301 (1989-04-01), Knierim

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