Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Reexamination Certificate
2005-10-18
2005-10-18
Mai, Tan V. (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
Reexamination Certificate
active
06957245
ABSTRACT:
A carry look-ahead adder capable of adding or subtracting two input signals includes first stage logic having a plurality of carry-create and carry-transmit logic circuits each coupled to receive one or more bits of each input signal. Each carry-create circuit generates a novel carry-create signal in response to corresponding first bit-pairings of the input signals, and each carry-transmit circuit generates a novel carry-transmit signal in response to corresponding second bit-pairings of the input signals. The carry-create and carry-transmit signals are combined in carry look-ahead logic to generate accumulated carry-create signals, which are then used to select final sum bits.
REFERENCES:
patent: 5898596 (1999-04-01), Ruetz
patent: 6175852 (2001-01-01), Dhong et al.
patent: 6742014 (2004-05-01), Bradley
Mai Tan V.
Martine & Penilla & Gencarella LLP
Sun Microsystems Inc.
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