Logic block with look-up table for configuration and memory

Details Logic block with look-up table for configuration and memory Logic block with look-up table for configuration and memory

1994-10-18

1995-05-09

Westin, Edward P.

Electronic digital logic circuitry

Multifunctional or programmable

Array

326 40, H03K 19177

Patent

active

054143772

ABSTRACT:
A logic block for a field programmable logic device which is of the type using memory bits in a look-up table to provide any function of several inputs, and which uses additional memory bits to control aspects of the configuration, achieves a smaller size by replacing memory bits which control some configuration choices of the logic block with multiplexers which alternately select a default configuration or allow the look-up table memory bits to control the configuration. Thus the memory bits perform an alternate function of serving as a look-up table to generate a function, and controlling gates such as multiplexers, XOR gates or AND gates to generate a function.

REFERENCES:
patent: 4706216 (1987-11-01), Carter
patent: 4870302 (1989-09-01), Freeman
patent: 5245226 (1993-09-01), Hood, Jr. et al.
patent: 5245227 (1993-09-01), Furtek et al.
Xilinx Programmable Gate Array Data Book, 1992, available from Xilinx, Inc. 2100 Logic Drive, San Jose Calif. 95124.

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