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CAPTURE AND USE OF DON'T CARES IN COMPUTER DESIGN LANGUAGES

IP.com Disclosure Number: IPCOM000039610D
Original Publication Date: 1987-Jul-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue

IBM

Related People

Authors:
Brayton, RK [+details]

Abstract

Described are several methods of defining and using don't care information during the processing of digital computer description languages. The methods provide a means of reducing the number of logic gates required to implement both control and data-flow logic. Don't cares as used in digital computer architectural design can be used by a designer to reduce the amount of logic gate hardware required to implement a digital system. This is done by selectively assigning the don't care points, in either the on-set or off-set of a logic function, and combining them with existing computer algorithms. Typically, hardware description specifications do not allow the designer to specify a don't care set and to make use of it during logic design.