ML7406 datasheet(25/104 Pages) LAPIS

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FEDL7406-02

ML7406

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●Packet Handling Function

○Packet format

ML7406 supports Wireless M-BUS frame FormatA/B, and Format C which is non Wireless M-BUS universal format. The

following packet handling are supported in FIFO mode or DIO mode

1) Preamble and SyncWord automatic insertion (TX)

--- DIO/FIFO mode

2) Preamble and SyncWord automatic detection (RX)

--- DIO/FIFOmode

3) Preamble and SyncWord automatic deletion (RX)

--- DIO/FIFO mode

4) CRC data insertion (TX)

--- FIFO mode

5) CRC check and error notification (RX)

--- DIO/FIFO mode

The following table shws control bits relative with the Packet format function.

Function

Control bit name

Packet formatsetting

PKT_FORMAT[1:0] ([PKT_CTRL1: B0 0x04(1-0)])

IEEE 802.15.4g setting

IEEE802_15_4G_EN ([PKT_CTRL1: B0 0x04(2)])

RX extended link layer mode disable

RX_EXTPKT_OFF ([PKT_CTRL1: B0 0x04(3)])

Data area bit order setting

DAT_LF_EN ([PKT_CTRL1: B0 0x04(4)])

Length area bit order setting

LEN_LF_EN ([PKT_CTRL1: B0 0x04(5)])

Extended link layer mode setting

EXT_PKT_MODE[1:0] ([PKT_CTRL1: B0 0x04(7-6)])

Length field setting

LENGTH_MODE ([PKT_CTRL2: B0 0x05(0)])

(1) Format A (Wireless M-BUS)

By setting PKT_FORMAT[1:0] ([PKT_CTRL1: B0 0x04(1-0)])=0b00, Wireless M-BUS Format A is selected.

Format A consists of 1st Block, 2nd Block and Optional Block(s). Each block has 2 bytes of CRC. “L-field” (1st byte of 1st

Block ) indicates packet length, which includes subsequenct user data bytes from “C-field”. However, CRC bytes and postamble

are excluded. Depending on “L-field” value, 2nd Block and Optional Block(s) are added.

The following [] indicates register address [bank #, address].

*1: Each mode has different minimum value of n.

*2: Indicates TX FIFO data storage area size.

*3: Indicates RX FIFO data storage area size.

*4: When RXDIO_CTRL[1:0] ([DIO_SET: B0 0x0C(7-6)])=0b10, indicates DCLK/DIO output area.

(*2)

Length

MSB

LSB

Preamble

Sync

Word

TX: automatic insertion

RX: automatic detection, deletion

field

Manchester/3-out-of-6 applicable [B0 0x07(3-2,1-0)]

1st Block

2nd Block

Optional Block

Postamble

CRC

field

CRC

field

Data

field

CRC

field

Data

field

byte

bytes

byte

bytes

Max.15

bytes

Max.16

bytes

0/2-8

bits

10/18/

32bits

> n*2 (*1)

bits

CRC applicable

(*2)

(*3)

(*4)

[B0 0x07]

[B0 0x42]

[B0 0x43]

[B0 0x08]

[B1 0x25-2E]

[B0 0x05]

[B0 0x7A/7B, 7D/7E]

[B0 0x44]

ML7406 Datasheet(PDF) 25 Page - LAPIS Semiconductor Co., Ltd.

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