ML7406 datasheet(34/104 Pages) LAPIS

34 / 104 page

FEDL7406-02

ML7406

34/104

○SyncWord detection function

ML7406 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_

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

ML7406 Datasheet(PDF) 34 Page - LAPIS Semiconductor Co., Ltd.

ML7406 Datasheet(HTML) 34 Page - LAPIS Semiconductor Co., Ltd.

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL