Circuit and method for determining membership in a set during a fuzzy logic operation
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United States of America Patent
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Mar 15, 1994
Grant Date -
N/A
app pub date -
Jun 17, 1992
filing date -
Jun 17, 1992
priority date (Note) -
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status (Latency Note)
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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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