Boots – shoes – and leggings
Patent
1993-12-13
1996-04-16
Mai, Tan V.
Boots, shoes, and leggings
364787, G06F 700
Patent
active
055089500
ABSTRACT:
A circuit and method for detecting if a sum of a first multibit number A of N bits and a second multibit B of N bits equals a third multibit number C of N bits prior to availability of the sum of A and B. A propagate signal, a generate signal and a kill signal are generated for each bit in the proposed sum. A zero signal is formed from these signals. The particular manner of formation of the zero signal for each bit depends upon the state of the third multibit number C for the corresponding bit and the prior bit. The zero signal is an exclusive OR of the corresponding propagate signal P.sub.n and a kill signal K.sub.n1 of a prior bit if the current bit and the prior bit of C are "00". The zero signal is an exclusive NOR of the corresponding propagate signal P.sub.n and a generate signal G.sub.n-1 of a prior bit if the current bit and the prior bit of C are "01". The zero signal is an exclusive NOR of the corresponding propagate signal P.sub.n and a kill signal K.sub.n-1 of a prior bit the current bit and the prior bit of C are "10". The zero signal is an exclusive OR of the corresponding propagate signal P.sub.n and a generate signal G.sub.n-1 of a prior bit if the current bit and the prior bit of C are "11". The sum of A and B equals C if all the zero signals are active "1". The propagate signal, generate signal and kill signal of the various bits can be used to from the sum. This technique provides the equality signal before the carry of the sum can ripple through the addition.
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IBM Technical Disclosure Bulletin vol. 30, No. 11, Apr. 88, pp. 288-290.
Agarwala Sanjive
Bosshart Patrick W.
Donaldson Richard L.
Kesterson James C.
Mai Tan V.
Marshall, Jr. Robert D.
Texas Instruments Incorporated
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