Texas Instruments SimpleLink CC2620 Technical Reference Manual page 1539

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SWCU117C – February 2015 – Revised September 2015
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Figure 23-7. CSMA-CA Operation
CMD_IEEE_CSMA
CW = initCW
Wait for start event
N
remainingPeriods = 0?
Y
remainingPeriods =
BE
random(2
í1)
Wait remainingPeriods
backoff periods
Check CCA state
CCA state Invalid?
N
Y
CCA state Idle?
N
CW = initCW,
NB = NB+1,
BE = min(BE+1,
macMaxBE)
N
NB >
macMaxCSMABackoffs?
Y
Failure
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N
Slotted?
Y
Wait for next backoff
period boundary
Wait 1 backoff period
Wait for RSSI update
Y
N
Slotted?
Y
CW = CWí1
N
CW = 0?
Y
Success
IEEE 802.15.4
1539
Radio