Circuit and method for determining membership in a set during a

Details Circuit and method for determining membership in a set during a Circuit and method for determining membership in a set during a

1992-06-17

1994-03-15

Fleming, Michael R.

395 3, 395 11, 395900, G06F 1518

Patent

active

052952290

ABSTRACT:
A circuit (14) and method which determine a degree of membership of an input in a membership set during a fuzzy logic operation. The degree of membership is calculated by a single "MEM" software instruction. The MEM instruction determines whether the system input has a degree of membership of zero, of a saturation level, or of some value in between. An operand assignment circuit (50) and an ALU (56) allow circuit (14) to determine the degree of membership more quickly. Assignment circuit (50) determines a multiplier for a multiplication operation based on a number of significant bits in the values to be multiplied. If the multiplier is smaller than the multiplicand, shorter multiplication operations may be performed. Additionally, ALU (56) operates in a split mode of operation which is able to perform two eight bit subtraction or multiplication operations concurrently which also results in these operations being performed more efficiently.

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"Implementing Fuzzy Expert Rules in Hardware" in the Apr. 1992 issue of AI Expert, vol. 7 No. 4, pp. 25 through 31, written by James M. Sibigtroth.
"Creating Fuzzy Micros" in the Dec. 1991 issue of Embedded Systems Programming, vol. 4, No. 12, pp. 1-10, written by James M. Sibigtroth.
User's Manual entitled "FP-3000 Digital Fuzzy Processor User's Manual" published by Omron Corporation.

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