Arithmetic device having a plurality of partitioned adders

Details Arithmetic device having a plurality of partitioned adders Arithmetic device having a plurality of partitioned adders

1990-11-28

1993-03-30

Smith, Jerry

Boots, shoes, and leggings

364745, G06F 750, G06F 738

Patent

active

051989930

ABSTRACT:
Input data are separated into a plurality of partitioned input data. A plurality of partitioned incrementers receive a plurality of partitioned input data respectively, and each include an adder adding "1" to partitioned input data, and a data selector selecting one of the partitioned data and output data from the adder in response to a selection signal. An n-th group is defined by a (2n-1)-th partitioned incrementer and a 2n-th partitioned incrementer, where "n" denotes natural numbers between 1 and a given number equal to a total number of groups. The n-th group includes the (2n-1)-th partitioned incrementer, the 2n-th partitioned incrementer, a group carry generating circuit, and a selection signal generating circuit, wherein the group carry generating circuit generates a group carry output of the n-th group on the basis of a carry output from an adder in the (2n-1)-th partitioned incrementer, a carry output from an adder in the 2n-th partitioned incrementer, and a carry input from an (n-1)-th group, and wherein the selection signal generating circuit generates a selection signal to a data selector in the 2n-th partitioned incrementer on the basis of the carry output from the adder in the (2n-1)-th partitioned incrementer and the carry input from the (n-1)-th group.

REFERENCES:
patent: 3553446 (1971-01-01), Kruy
patent: 3842250 (1974-10-01), Anderson
patent: 4682303 (1987-07-01), Uya
patent: 5027310 (1991-06-01), Dalrymple
patent: 5047976 (1991-09-01), Goto et al.

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