Browse Prior Art Database

Exclusive or Programmed Logic Array Bit Partitioning

IP.com Disclosure Number: IPCOM000084853D
Original Publication Date: 1976-Jan-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Halada, JR: AUTHOR [+4]

Abstract

In programmed logic arrays where some units only drive equal - unequal functions such as compare, modulo 2 addition, test under mask, etc., which are exclusive OR functions, the standard bit partitioning circuits shown in U. S. Patents 3,593,317 and 3,761,902 can be changed to provide the exclusive OR functions directly, thereby saving up to 50% of the array logic.

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Exclusive or Programmed Logic Array Bit Partitioning

In programmed logic arrays where some units only drive equal - unequal functions such as compare, modulo 2 addition, test under mask, etc., which are exclusive OR functions, the standard bit partitioning circuits shown in U. S. Patents 3,593,317 and 3,761,902 can be changed to provide the exclusive OR functions directly, thereby saving up to 50% of the array logic.

Fig. 1 shows equal-unequal functions driven by standard bit partitioning circuits. Fig. 2 shows the use of exclusive OR bit partitioning with the resultant saving.

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