Output macrocell for programmable logic device

Details Output macrocell for programmable logic device Output macrocell for programmable logic device

1988-10-11

1990-01-16

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307468, H03K 19177

Patent

active

048945633

ABSTRACT:
A programmable logic device having an AND array receiving inputs and having programmable product term lines output to an OR array, and an output macrocell associated with each of a plurality of input/output pins. Each macrocell has a plurality of sum term lines from the OR array which may selectively be combined or left distinct, and a plurality of flip-flop registers receiving input from the combined or distinct sum lines. Each flip-flop has product term programmable clock, reset and preset lines and a dedicated feedback line into the AND array. A selection circuit is provided for selecting combinatorial output from one or more sum term lines or registered output from one of the flip-flop registers. A product term programmable output enable selects either the output or disables the output buffer so that a pin may receive input signals fed through a dedicated line into the AND array.

REFERENCES:
patent: 3566153 (1971-02-01), Spencer Jr.
patent: 3816725 (1974-06-01), Greer
patent: 3818452 (1974-06-01), Greer
patent: 4124899 (1978-11-01), Birkner et al.
patent: 4422072 (1983-12-01), Cavlan
patent: 4644192 (1987-02-01), Fisher
patent: 4684830 (1987-08-01), Tsui et al.
patent: 4717912 (1988-01-01), Harvey et al.
patent: 4742252 (1988-05-01), Agrawal
patent: 4758746 (1988-07-01), Birkner et al.
patent: 4758747 (1988-07-01), Young et al.
patent: 4771285 (1988-09-01), Agrawal et al.
Logic Diagrams for Monolithic Memories 32VX10, 20RA10 and 20RS10 Logic Devices.

Affiliated with

Also associated with

Rating

Output macrocell for programmable logic device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Output macrocell for programmable logic device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Output macrocell for programmable logic device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1336704