ML7406 datasheet(33/104 Pages) ETC2

33 / 104 page

FEDL7406-02

ML7406

33/104

○Data whitening function (non Wireless M-BUS standard)

ML7406 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 Whiteing setting enable

WHT_SET ([DATA_SET2: B0 0x08(0)])

Data Whiteing initiazation value

WHT_INIT[8:0] ([WHT_INIT_H/L: B1 0x64(0)/65(7-0)])

Whitening polynomia

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]

programmed.

(Note)

:exclusive OR

Whitening data generation circuits

(generator polynomial: x9 + x5 + 1)

General PN9 polynomial can be defined by [WHT_CFG].

PN9 polynomial

WHT_CFG[7:0]

[WHT_CFG: B1 0x66]

9 + x4 + 1

0x08

9 + x5 + 1

0x10

Whitening

data

ML7406 Datasheet(PDF) 33 Page - List of Unclassifed Manufacturers