ML7344J datasheet(77/151 Pages) ETC2

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FEDL7344C/E/J-04

ML7344C/E/J

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(4) IDLE determination exclusion under strong signal input

If acquired ED value exceeds [CCA_IGNORE_LVL: B0 0x36] register, IDLE dertermination is not

performed as lon as a given ED value is included in the averaging target range. If average ED value including

this strong ED value indicated in [ED_RSLT: B0 0x39] rehgiser exceeds the CCA threshold value defined by

[CCA_LVL: B0 0x37] register, it is considered as ”BUSY”. And CCA_RSLT[1:0]([CCA_CTRL: B0

0x39(1-0)])=0b01 is set.

If average ED value is smaller than CCA threshold value, IDLE determination is not performed and

CCA_RSLT[1:0] indicates 0b11 ”CCA evaluation on-going (ED value excluding CCA judgement

acquisition)”. CCA will continue until “IDLE” or “BUSY” determination (in case of IDLE detection mode,

“IDLE” is determined. In case of continuous mode, CCA_STOP([CCA_CTRL: B0 0x39(7)]) is issued.)

NOTE:

CCA completion interrupt (INT[18] group3) is generated only when “IDLE” or “BUSY” is determined.

Therefore, if data whose ED value exceeds CCA_IGNORE_LVL are input intermittently, neither “IDLE” or

“BUSY” can be determined and CCA may continues.

[ED value acquisition under extrem strong signal]

ED value (analog)

[CCA_IGNORE_LVL: B0 0x36]

ED value

Shift register

(ED value 8 times

average)

[Time 1]

[Time2]

[Time 3]

[Time 8]

[Time 9]

Averaging target includes

ED value exceeding

CCA_IGNORE_LVL.

In this case “IDLE” is not

determined.

However, if averaging value

exceeds CCA threshold,

“BUSY” is determined.

ED value >CCA_IGNORE_LVL

●

ED value, which includes CCA_IGNORE_LVL,

is out of averaging target. In this case, “IDLE”

can be determined.

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