4:2 Carry save adder and 4:2 carry save adding method

Details 4:2 Carry save adder and 4:2 carry save adding method 4:2 Carry save adder and 4:2 carry save adding method

2005-01-10

2009-11-17

Bullock, Jr., Lewis A (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

C708S620000, C708S709000

Reexamination Certificate

active

07620677

ABSTRACT:
Provided are a simplified 4:2 carry save adder (CSA) cell and a 4:2 carry save adding method. The 4:2 CSA cell is formed of an odd detector and first through sixth switches through logic optimization. The odd detector generates an XOR of the first through fourth input signals, outputs the XOR as an odd signal, generates an XOR of the first and second input signals, and outputs the XOR as a first XOR signal. The first switch outputs the third input signal as a carry output signal in response to the first XOR signal. The second switch outputs the first input signal as the carry output signal in response to an inverted first XOR signal. The third switch outputs the carry input signal as a carry signal in response to the odd signal. The fourth switch outputs the fourth input signal as the carry signal in response to an inverted odd signal. The fifth switch outputs an inverted carry input signal as a sum signal in response to the odd signal. The sixth switch outputs the carry input signal as the sum signal in response to the inverted odd signal.

REFERENCES:
patent: 5491653 (1996-02-01), Taborn et al.
patent: 5805491 (1998-09-01), Bechade
patent: 5818747 (1998-10-01), Wong
patent: 7284029 (2007-10-01), Belluomini et al.
patent: 2003/0145032 (2003-07-01), Bradley et al.
patent: 2000-235477 (2000-08-01), None
patent: 97-22732 (1997-05-01), None

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