Carry/borrow propagate adder/subtractor

Details Carry/borrow propagate adder/subtractor Carry/borrow propagate adder/subtractor

1986-04-21

1988-04-19

Malzahn, David H.

Boots, shoes, and leggings

G06F 750

Patent

active

047395036

ABSTRACT:
A digital arithmetic combiner having improved overflow signal propagation delay characteristics is disclosed. Such an arithmetic combiner includes a tristate device having a data input terminal coupled to an overflow input terminal and a data terminal coupled to an overflow output terminal. A tristate control terminal is coupled to the output of logic circuitry. The logic circuitry is responsive to operand input signals and enables the tristate device to generate a signal at its data output terminal when the operand input signals have different logic states. In addition, an overflow generator is responsive to the operand input signals, and generates a signal indicating overflow conditions at the overflow output terminal when the operand input signals have the same logic state.

REFERENCES:
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patent: 4523292 (1985-06-01), Armer
patent: 4536855 (1985-08-01), Morton
patent: 4563751 (1986-01-01), Barker
patent: 4564921 (1986-01-01), Suganuma
patent: 4685079 (1987-08-01), Armer
N. H. E. Westz et al., "Principles of CMOS VLSI Design;" 1985; Addison-Wesley Pub. Co.; pp. 310-314.

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