Total sum calculation circuit capable of rapidly calculating a t

Details Total sum calculation circuit capable of rapidly calculating a t Total sum calculation circuit capable of rapidly calculating a t

1989-12-27

1991-06-04

Shaw, Dale M.

Boots, shoes, and leggings

G06F 738

Patent

active

050219863

ABSTRACT:
A total sum calculation circuit for calculating a total sum of first through n-th input data represented by a floating point representation and which are composed of first through n-th exponent parts and first through the n-th fraction parts, where n is an integer greater than two. An n-input data comparison circuit simultaneously compares first through the n-th exponent parts with one another to produce a maximum one of the first through the n-th exponent parts and a comparison result signal representative of which one of the first through n-th exponent parts is the maximum exponent part. Supplied with the first through the n-th exponent parts and the comparison result signal, a shift number calculation circuit calculates first through n-th shift digit numbers between the maximum exponent part and the first through the n-th exponent parts. The first through the n-th fraction parts are shifted by first through n-th shift digit numbers in first through n-th shifters are produced as first through n-th shifted fraction parts summed up into an unnormalized fraction part which part is normalized into a total sum fraction part by normalization information derived from the unnormalized fraction part. The maximum exponent part is also normalized by the normalization information into a total sum exponent part. A combination of the total sum exponent part and the total sum fraction part is produced as the total sum represented by the floating point representation.

REFERENCES:
patent: 4562553 (1985-12-01), Mattedi et al.
patent: 4734876 (1988-03-01), Williams
patent: 4918636 (1990-04-01), Iwata et al.

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