Comparator scheme

Details Comparator scheme Comparator scheme

1995-03-06

1997-07-01

Malzahn, David H.

Boots, shoes, and leggings

36478701, G06F 750

Patent

active

056445210

ABSTRACT:
Method for testing whether the result of an addition or subtraction of two or more variables will equal a specified third value without actually performing an addition or subtraction operation. The method involves the representation of the inputs to the carry ripple portion of an adder at any bit position by a plurality of mutually exclusive variables, and testing the plurality of variables against a plurality of predetermined conditions. A determination is then made as to whether the test is positive or negative--if positive, the result of the mathematical operation is the predetermined number, and if negative, the result of the mathematical operation is not the predetermined number.

REFERENCES:
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patent: 5020016 (1991-05-01), Nakano et al.
patent: 5270955 (1993-12-01), Bosshart et al.
patent: 5367477 (1994-11-01), Hinds et al.
patent: 5508950 (1996-04-01), Bosshart et al.
IEEE Transactions on Computers, vol. 41, No. 11, Nov. 1992, New York, pp. 1484-1488, XP 000331189, Cortadella et al "Evaluation of A+B=K Conditions Without Carry Propagation".
IEEE International Symposium on Circuits and Systems, ESP00, Jun. 7-9, 1988, vol. 1 of 3, Institute of Electrical and Electronics Enginners, pp. 243-246, XP 000011396, "Evaulating A+B=K Conditions in Constant Time", Cortadella J. et al.

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