Highly integrated programmable logic array utilizing AND and OR

Details Highly integrated programmable logic array utilizing AND and OR Highly integrated programmable logic array utilizing AND and OR

1982-05-17

1984-08-28

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 700

Patent

active

044687354

ABSTRACT:
A programmable logic array (PLA) is comprised of double-personalized cells conventionally arranged in an AND and OR array. In order to activate redundant or Don't Care positions, i.e., array positions not being used for performing the respective PLA functions, control circuits are provided preceding the AND array as well as between the AND and the OR array. This allows an increase in the number of possible PLA functions to be performed by a given PLA thus providing PLA's with improved functional density. The control circuits essentially consist of two-stage AND-OR circuits being fully compatible with the AND and OR array technology of the PLA. For optimum utilization of the Don't Care positions and planes, each functional input can be switched to any discretionary functional line of the PLA. By providing an additional control line in the OR array, the control logic for the entire OR array is reduced to only two AND gates.

REFERENCES:
patent: 3987286 (1976-10-01), Muehldorf
patent: 4053793 (1977-10-01), Ernst et al.
patent: 4084152 (1978-04-01), Long et al.
patent: 4103182 (1978-07-01), Bradley
patent: 4177452 (1979-12-01), Balasubramanian et al.
patent: 4195352 (1980-03-01), Tu et al.
patent: 4208728 (1980-06-01), Blahut et al.
patent: 4233667 (1980-11-01), Devine et al.
patent: 4237542 (1980-12-01), Cukier
patent: 4293783 (1981-10-01), Patil
patent: 4354228 (1982-10-01), Moore et al.
IBM Technical Disclosure Bulletin, vol. 20, No. 10, Mar. 1978, "Increasing Chip Density by Space Sharing of Programmed Logic Arrays" by Balasubramanian et al., pp. 4016-4018.
IBM Technical Disclosure Bulletin, vol. 24, No. 2, Jul. 1981, "Three-Dimensional Programmable Logic Array" by Goetze et al., pp. 886-887.
MOS/LSI Design and Application, by W. Carr and J. Mize, McGraw Hill 1972, pp. 229-258.
IBM Technical Disclosure Bulletin, vol. 17, No. 3, Aug. 1974, pp. 811-812.

Affiliated with

Also associated with

Rating

Highly integrated programmable logic array utilizing AND and OR does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Highly integrated programmable logic array utilizing AND and OR , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Highly integrated programmable logic array utilizing AND and OR will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-880774