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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ML7344CE датащи(PDF) 40 Page - LAPIS Semiconductor Co., Ltd. |
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ML7344CE датащи(HTML) 40 Page - LAPIS Semiconductor Co., Ltd. |
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40 / 154 page  FEDL7344C/E/J-05 ML7344C/E/J 40/154 ●Data whitening function (non Wireless M-BUS standard) ML7344 supports Data whitening function. In packet format A/B, subsequent data followed by C-field can be processed data whitening. In packet format C, data Whitening is applied from data field. Data generated by the following 9 bit pseudo random sequence (PN9) will be “XOR” with TX data (encoded data if Manchester or 3-out-of 6 coding is selected) before transmission. Intialization value of the PN9 generation shift register can be defined by [WHT_INIT_H/L: B1 0x64/65] registers. PN9 polynomial can be programmed with [WHT_CFG: B1 0x66] register. Function Control bit name Data whitening setting enable WHT_SET ([DATA_SET2: B0 0x08(0)]) Data whitening initialization value WHT_INIT[8:0] ([WHT_INIT_H/L: B1 0x64(0)/65(7-0)]) Whitening polynomial WHT_CFG[7:0] ([WHT_CFG: B1 0x66(7-0)]) In order to make feedback from S1 register, setting 0b1 to WHT_CFG0 ([WHT_CFG: B1 0x66(0)]). Similaly in order to make feedback from S2 register, setting 0b1 to WHT_CFG1 ([WHT_CFG: B1 0x66(1)]). Other bits of [WHT_CFG: B1 0x66] register has same function. Two or more bits can be also set to 0b1. Therefore any type of PN9 polinominal can be programmed. NOTE: exclusive OR Fig.5 Whitening data generation circuits (generator polynomial: x9 + x5 + 1) General PN9 polynomial can be defined by WHT_CFG[7:0]. PN9 polynomial WHT_CFG[7:0] [WHT_CFG: B1 0x66] x 9 + x4 + 1 0x08 x 9 + x5 + 1 0x10 S8 S7 S6 S5 S4 S3 S2 S1 S0 Whitening data |
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