ST52T301P datasheet(16/100 Pages) STMICROELECTRONICS

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2.4.5 Input Membership Function

ST52x301 allows to manage triangular Mbfs. In

order to define a Mbf it is necessary to store three

different data on the memory:

the vertex of the Mbf: V;

the lenght of the left semi-base: LVD;

the lenght of the right semi-base: RVD;

In order to reduce the dimension of the memory

area and the computational effort the vertical

dimension of the vertex is fixed to 15 (4 bits)

By using the previous memorization method it is

possible to store different kinds of triangular

Memberships Functions. In the following figure is

shown a typical example of Mbfs that can be

defined in ST52x301

Each Mbf is then defined storing 3 bytes. To store

all the information related with the fuzzy project

Mbfs, it is necessary to use 192 bytes of the

memory (3 bytes*16 Mbfs*4 Inputs = 192 bytes).

LVD

RVD

Input Mbf

Output Singleton

Output Variable

Input Variable

Figure 2.12. Mbfs Parameters

Figure 2.13. Example of valid Mbfs

The Mbf is memorized by using the following

instruction:

DATA n m lvd v rvd

where

n identifies the input, m identifies the Mbf among

the 16 possibleMbfs, lvd, v, rvd are the parameters

describing the Mbf’s shape.

2.4.6 Output Singleton

ST52x301uses for the output variables a particular

kind of membership function called Singleton. A

Singleton has not a shape, like a traditional Mbf,

and it is characterized by a single point identified

by the couple (X,

ω), where the ω is calculated by

the Inference Unit as described before.

Often a Singleton is simply identified with its Crisp

Value X.

16/99

ST52T301/E301

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