ML7396AB datasheet(53/140 Pages) LAPIS

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FEDL7396A/B/E-07

ML7396A/B/E

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CCA operation during diversity

(1) CCA operation during diversity search

During diversity search, If CCA command is issued, diversity terminated and CCA starts.

Upon CCA starting, antenna is fixed to the default value (*1), maintaining until next diversity search. However, if

TX_ANT_EN ([2DIV_RSLT:B0 0x72(5)])=0b1 is set, antenna is specified by TX_ANT ([2DIV_RSLT:B0 0x72(4)]) and

maintaining until next diversity search.

After CCA completion, if SFD is not detected during diversity search time specified by SEARCH_TIME[6:0]

([2DIV_SEARCH:B0 0x6F(6-0)]) (default approx. 330μs), diversity search will be executed again. If SFD is detected

during CCA or after CCA completion, continuing RECEIVE state and diversity search is not executed.

* 1 : Please refer the each table of “Antenna switching function” in “Diversity Function”.

(Upper setting in the "RX" state column)

After CCA completion, if SFD

is not detected during diversity

search time, diversity search is

executed again.

Maintaining the antenna

during diversity search

time. (default: 330μs)

When TX_ANT_EN=0b1,

the antenna is switched to the

specified by TX_ANT.

When TX_ANT_EN=0b0 ,

If SFD is detected, maintaining

RECEIVE state.

the antenna is initialized to

ANT1.

[Note]

When executing CCA during diversity search, set the waiting taimer for waiting for CAA completion interrupt (INT[08]

group2). Since CCA executing timing is same as the diversity search completion, CCA completion interrupt may not be

notified. When timeout occurs, the latest result is stored into CCA_RSLT[1:0] ([CCA_CNTRL:B0 0x15(1-0)]). In this

case, if executing CCA again, set CCA_LOOP_STOP ([CCA_CNTRL:B0 0x15(6)])=0b1 before issuing CCA command.

For waiting timer setting, please refer to the CCA execution time described in "Normal mode".

For details of the CCA execution flow during diversity search, please refer to "CCA operation during diversity" in the

“Flow Charts”.

During CCA operarion, RX operation is performed at the same time. Even if CCA_DONE is not notified, SFD detection

interrupt (INT[11] group2), RX FIFO access error interruption (INT[14] group2), FIFO-Full interrupt (INT[05] group1),

FIFO0/1 RX completion interrupt (INT[18]/[19] group3), or FIFO0/1 CRC error interrupt (INT[20]/[21] group3) may be

notified.

For details of the diversity function, please refer to "Diversity Function".

ANT_SW

CCA_EN

Diversity search

CCA

CCA_DONE

Diversity search

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