Enhanced apparatus for binary quotient, binary product, binary s

Details Enhanced apparatus for binary quotient, binary product, binary s Enhanced apparatus for binary quotient, binary product, binary s

1975-12-15

1977-05-24

Malzahn, David H.

Registers

Transfer mechanism

Traveling pawl

G06F 752

Patent

active

040257738

ABSTRACT:
Three modular arrays structured from a common module are connected together a first way to form a binary quotient by successive approximations, or a second way to form a binary product. Any one of the three modular arrays may be used to add or subtract two binary numbers. To divide, one array is utilized to effectively form the reciprocal of the binary divisor, most significant bit first, by successive approximation. Control circuitry, including a carry detector, dictates the formation of the shift and add sequence that effectively represents the reciprocal of the divisor by controlling the positioning of the divisor before each addition step so that the product is a series of binary ones. The add and shift sequence utilized to generate the series of binary ones, as it is evolving, is also being utilized to manipulate the dividend, thereby forming the quotient, most significant bit first. In effect, the dividend is being multiplied by the reciprocal of the divisor so as to form an approximate product of the dividend and reciprocal of the divisor, most significant bit first. This product is actually an increasingly precise approximation of the quotient of the dividend and divisor. The binary product of two numbers is formed, most significant bit first, by manipulating the multiplicand according to an add and shift sequence determined by use of the multiplier.

REFERENCES:
patent: 3591787 (1971-07-01), Friman
patent: 3633018 (1972-01-01), Ling
patent: 3648038 (1972-03-01), Sierra
patent: 3752971 (1973-08-01), Calhoun
patent: 3777132 (1973-12-01), Bennett
M. J. Flynn, "On Division by Functional Iteration" IEEE Trans. on Computers vol. C-19, No. 8 pp. 702-706, Aug. 1970.

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