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Table 23-58. IEEE 802.15.4 CSMA-CA Command Structure (continued)
Bytes Field Name Bits Bit Field Name Type Description
The BE parameter from the IEEE 802.15.4
20 BE R/W
CSMA-CA algorithm
The number of remaining periods from a
21 remainingPeriods R/W
paused backoff countdown
22 lastRssi R RSSI measured at the last CCA operation
Trigger that causes the device to end the
23 endTrigger W
CSMA-CA operation
24–27 lastTimeStamp R Time of the last CCA operation
28–31 endTime W Time parameter for endTrigger
Table 23-59. IEEE 802.15.4 TX Command Structure
Bytes Field Name Bits Bit Field Name Type Description
0: Find PHY header automatically.
0 bIncludePhyHdr W
1: Insert PHY header from the buffer.
0: Append automatically calculated CRC.
1 bIncludeCrc W
1: Insert FCS (CRC) from the buffer.
14 txOpt
2 Reserved
Most significant bits of payload length. Should only
3–7 payloadLenMsb W be nonzero to create long non-standard packets for
test purposes
15 payloadLen W Number of bytes in the payload
16–19 pPayload W Pointer to payload buffer of size payloadLen
20–23 timeStamp R Time stamp of transmitted frame
Table 23-60. IEEE 802.15.4 Recieve ACK Command Structure
Bytes Field Name Type Description
14 seqNo W Sequence number to expect
Trigger that causes the device to give up
15 endTrigger W
acknowledgment reception
16–19 endTime W Time parameter for endTrigger
Table 23-61. IEEE 802.15.4 Update Radio Settings Command Structure
Bytes Field Name Type Description
14–15 Reserved
16–19 pRegOverride W Pointer to a list of hardware registers to override
23.5.1.2 IEEE 802.15.4 Immediate Command Structures
Table 23-62. IEEE 802.15.4 Modify CCA Immediate Command Structure
Bytes Field Name Type Description
0–1 commandNo W The command number
New value of ccaOpt for the running background
2 newCcaOpt W
level operation, see Table 23-68 for details
New value of ccaRssiThr for the running
3 newCcaRssiThr W
background level operation
1496
Radio SWCU117A–February 2015–Revised March 2015
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