Function block

Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed

Reexamination Certificate

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Details

C708S713000, C708S707000, C708S708000, C708S709000, C708S710000, C326S038000, C326S039000

Reexamination Certificate

active

10968554

ABSTRACT:
A function block allows a multiplier and a multi-input multiplexer to be realized with a small number of blocks. A logical function generator generates a logical output signal from first to fourth logical inputs thereof according to a logical function selected from a plurality of 4-input/1-output logical functions depending on configuration data. A 4-2 carry block generates a 4-2 carry output from the second to fourth logical inputs. A first signal is generated from at least the logical output, a second signal from at least the first logical input, a third signal from at least a 4-2 carry input signal, and a fourth signal from at least the 4-2 carry input signal. A multiplexer selects one of the second and third signals depending on the first signal to produce a carry output signal. An exclusive OR circuit produce an exclusive-ORed result from the logical output and the fourth signal.

REFERENCES:
patent: 5808928 (1998-09-01), Miyoshi
patent: 5818747 (1998-10-01), Wong
patent: 6097212 (2000-08-01), Agrawal et al.
patent: 6157209 (2000-12-01), McGettigan
patent: 6188240 (2001-02-01), Nakaya
patent: 10-55265 (1998-02-01), None
patent: 10-333884 (1998-12-01), None
patent: 11-24891 (1999-01-01), None
patent: 11-122096 (1999-04-01), None
patent: 11-353152 (1999-12-01), None
European Search Report for EP application No.: EP 02 013 978.8-2215 dated Dec. 9, 2006.

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