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ST52F510 Datasheet(PDF) 58 Page - STMicroelectronics |
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ST52F510 Datasheet(HTML) 58 Page - STMicroelectronics |
58 / 106 page ST52F510/F513/F514 58/106 Figure 8.5 Example of valid Mbfs 8.6 Output Singleton The Decision Processor uses a particular kind of membership function called Singleton for its output variables. A Singleton doesn’t have a shape, like a traditional Mbf, and is characterized by a single point identified by the couple (X, w), where w is calculated by the Inference Unit as described earlier. Often, a Singleton is simply identified with its Crisp Value X. Figure 8.6 Output Membership Functions 8.7 Fuzzy Rules Rules can have the following structures: if A op B op C...........then Z if (A op B) op (C op D op E...) ...........then Z 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 brackets. Each rule is codified by using an instruction set, the inference time for a rule with 4 antecedents and 1 consequent is about 3 microseconds at 20 MHz. The Assembler Instruction Set used to manage the Fuzzy operations is reported in the table below. 1 i-th OUTPUT 0 X ij X i0 X in ω i0 ω ij ω in j-th Singleton Table 8.1 Fuzzy Instructions Set Instruction Description MBF n_mbf Ivd v rvd Stores the Mbf n_mbf with the shape identified by the parameters Ivd, v and rvd IS n m Fixes the alpha value of the input n with the Mbf m ISNOT n m Calculates the complementary alpha value of the input n with the Mbf m. FZAND Implements the Fuzzy operation AND FZOR Implements the Fuzzy operation OR CON crisp Multiplies the crisp value with the last ω weight OUT n_out Performs Defuzzyfication and stores the currently Fuzzy output in the register n_out FUZZY Starts the computation of a sigle fuzzy variable ( ) Modify the priority in the rule evaluation |
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