ST52T301 datasheet(17/100 Pages) STMICROELECTRONICS

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2.4.7 Fuzzy Rules.

The rules can have the following structures:

if A op B op C...........then Z

if (A op B) op ( C op D op E...) ...........thenZ

where op is one of the possible linguistic operators

(AND/OR)

In the first case the rule operators are managed

sequentially; in the second one, the priority of the

operator is fixed by the brakets.

Each rule is codified by using an istruction set, the

inference time for a rule with 4 antecedents and 1

consequent is about 3 microseconds.

The assembler Instruction Set allowing to manage

the fuzzy instructions are reported in the following

table:

Instruction

Description

DATA n m lvd v rvd

Stores the Mbf m of the input n with the shape identified by the parameters lvd, v and rvd.

LDP n m

Fixes the alpha value of the input n with the Mbf m and stores it in the data stack.

LDN n m

Calculates the negated alpha value of the input n with the Mbf m and store the result in the data

stack.

FZAND

Implements the fuzzy operation AND between the last two values stored in the data stack.

FZOR

Implements the fuzzy operation OR between the last two values stored in the data stack.

LDK

Stores the result of the last fuzzy operation executed in the data stack.

SKM

Stores the result of the last fuzzy operation executed in the memory register M.

LDM

Copies the value of the register M in the data stack.

CON crisp

Multiplies the crisp value with the last

ω weight.

OUT n_out

Performs the defuzzification.

STOP

Ends the fuzzy algorithm.

Table 2.4. Fuzzy Instructions Set

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