ML7344J datasheet(41/151 Pages) ETC2

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FEDL7344C/E/J-04

ML7344C/E/J

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●SyncWord detection function

ML7344 supports automatic SyncWord recognition function. By having two sets of SyncWord pattern storage

area, it is possible to detect two different packet format (Format A/B) which are defined by Wireless M-Bus.

(For details, please refer to Wireless M-BUS standard) Receiving packet format is indicated by

SW_DET_RSLT([STM_STATE:B0 0x77(5)]). In Format C, it is possible to search for two SyncWords but

detected result is not indicated.

1) TX

SyncWord pattern defined by SYNCWORD_SEL ([DATA_SET2: B0 0x08(4)]) will be selected. SyncWord

length for TX is defined by SYNC_WORD_LEN[5:0] ([SYNC_WORD_LEN: B1 0x25(5-0)]). From high bit

of each SyncWord pattern will be transmitted.

SYNCWORD_SEL

TX SyncWord pattern

SYNC_WORD1[31:0]

([SYNCWORD1_SET3/2/1/0: B1 0x27/28/29/2A])

SYNC_WORD2[31:0]

([SYNCWORD2_SET3/2/1/0: B1 0x2B/2C/2D/2E])

[Example] SyncWord patten and SyncWord length

If the follwing registers are programmed, from higher bit of SYNC_WORD1[17:0] will be transmitted

sequencially.

[SYNC_WORD_LEN: B1 0x25]=0x12

SYNCWORD_SEL ([DATA_SET2: B0 0x08(4)]) = 0b0

If the following registers are programmed, from higher bit of SYNC_WORD2[23:0] will be transmitted

sequencially.

[SYNC_WORD_LEN: B1 0x25]=0x18

SYNCWORD_SEL ([DATA_SET2: B0 0x08(4)]) = 0b1

2) RX

By setting SYNCWORD_SEL and 2SW_DET_EN ([DATA_SET2: B0 0x08(4,3)]), One SyncWord pattern

waiting or two SyncWord patterns waiting can be selected as follows: Packet format automatic detection is

valid if 2SW_DET_EN=0b1 and Format A or Fromat B is selected by PKT_FORMAT[1:0] ([PKT_CTRL1:B0

0x04(1-0)]).

2SW_

DET_EN

SYNCWORD

_SEL

SyncWord pattern

During Sync

Detection

SyncWord

Detection

operation

Automatic

packet

format

detection

Data process after SyncWord

SYNC_WORD1[31:0]

Waiting for

1 pattern

Process according to each

Format setting

SYNC_WORD2[31:0]

Waiting for

1 pattern

Process according to each

Format setting

−

SYNC_WORD1[31:0]

SYNC_WORD2[31:0]

Waiting for

2 patterns

yes

[Format A or Format B setting]

If matched with SYNC_WORD1,

then process as Format A.

If matched with SYNC_WORD2,

then process as Format B.

[Format C setting]

Process as Format C

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