ML7344J datasheet(111/151 Pages) ETC2

111 / 151 page

FEDL7344C/E/J-04

ML7344C/E/J

111/151

(2) FIFO mode (less than 64 byte)

FIFO mode (packet mode) can be selected by setting TXDIO_CTRL[1:0]([DIO_SET: B0 0x0C(5-4)])=0b00.

In FIFO mode, data is written to the TX_FIFO by [WR_TX_FIFO:B0 0x7C] register. After writing full data of

a packet, issuing TX_ON by [RF_STATUS:B0 0x0B] resister. Following preamble/SyncWord, TX_FIFO data

is transmitted to the air. Upon TX completion interrupt (INT[16] group 3) occurs, interrupt must be cleared. If

the next TX packet is sent, the next TX packet data is written to the TX_FIFO. If RX is expected after TX,

RX_ON should be issued by [RF_STATUS: B0 0x0B] resister. TX can be terminated by issuing TRX_OFF by

[RF_STATUS:B0 0x0B] register.

START

Write TX data

[WR_TX_FIFO:B0 0x7C]

TX_ON issue

[RF STATUS: B0 0x0B]

TX completion (INT[16])?

[INT_SOURCE_GRP3: B0 0x0F(0)]

Yes

INT[16] clear

[INT_SOURCE_GRP3: B0 0x0F])

Next packet TX ?

Yes

TRX_OFF issue

[RF_STATUS: B0 0x0B]

Write TX data

[WR_TX_FIFO:B0 0x7C]

RX?

RX_ON issue

[RF_STATUS: B0 0x0B]

Yes

TX_FIFO trigger level setting

[TXFIFO_THRH: B0 0x17]=0x00

[TXFIFO_THRL: B0 0x18]=0x00

TX data request accept

Completion (INT[17])?

[INT_SOURCE_GRP3: B0 0x0F(1)]

CCA execution ?

To CCA flowchart

i) If random back-off period specified in

the IEEE is used, go to CCA normal

mode.

ii) If IDLE is detected in minimum period,

go to CCA IDLE detection mode.

Yes

Set RX_ON after TX completion?

[RF_STATUS_CTRL:B0 0x0A]

Yes

If the TX data length is shorter than the

FAST_TX trigger level, TX will start by

writing all data to FIFO.

Set TRX_OFF/SLEEP after TX?

[RF_STATUS_CTRL:B0 0x0A]

Yes

※

please refer to RF state

transition wait flow.

To RF state transition wait

flow

INT[17] clear

[INT SOURCE GRP3: B0 0x0F]

CCA result=BUSY?

From CCA flowchart

CCA continue?

Yes

TRX_OFF issue

[RF_STATUS: B0 0x0B]

TX FIFO clear

[STATE CLR: B0 0x16]

To RF state transition wait

flow

Yes

To RF state transition wait flow

To RF state transition wait

and RX flow

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