ST52T301 datasheet(14/100 Pages) STMICROELECTRONICS

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2.4 FUZZY CORE

ST52x301 Fuzzy Core main features are:

Up to 4 Inputs with 8-bit resolution

Up to 16 Membership Functions (Mbfs) for each

Input (64 possible Mbfs)

Up to 2 Outputs with 8-bit resolution

Possibility to process fuzzy rules with a max.

number of 8 antecedents

2.4.1 Internal Structure

The block diagram shown in figure 2.9 describes

the structure of ST52x301Fuzzy Core.In this figure

we can distinguishdifferentfunctionalblocks:Alpha

Calculator, Inference Unit and Defuzzifier. These

blocks allow to perform a MAMDANI type fuzzy

inference with crisp consequents.It is important to

underline that the fuzzy inference is performed by

using as inputs the first 4 locationsof the Registers

File.

2.4.2 Alpha Calculator Unit

This block performs the intersection (alpha weight)

between the input values and the related Mbfs (fig.

2.8).

Input Value

αij

j-th Mbf

i-th INPUT VARIABLE

Figure 2.8. Alpha Weigth calculation

Figure 2.9. Fuzzy Core Block Diagram

Notice that the inputs for this block come from the

first four locations of the Register File; it means the

user, to evaluate a fuzzy function, must load the

input values in these registers.

Alpha Calculato r pe rfor ms what is call ed

fuzzification: the input data are transformed in

activation level (alpha weight) of the Mbfs.

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ST52T301/E301

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