MRF24XA_15 Datasheet, PDF (174/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

MRF24XA
6.4 Security Material Retrieval
Support with Proprietary Frames
FIGURE 6-4:
PROPRIETARY MAC AUXSECHDR OCTETS (ONLY PRESENT WHEN SECEN = 1)
SecLayer = 00 (MAC layer security only)
7:2
1:0
MacPayIndex
(6 bits)
SecLayer
(2 bits)
1-byte
SecLayer = 01 (NWK layer security only)
15:9
NetPayIndex
(7 bits)
8:2
NetHdrIndex
(7 bits)
2 bytes
1:0
SecLayer
(2 bits)
SecLayer = 10 (MAC and NWK layer security)
23
22:16
15
14:8
7:2
0
NetPayIndex
(7 bits)
0
NetHdrIndex
(7 bits)
MacPayIndex
(6 bits)
3 bytes
Note: Always encode Security Indices with DA present (Inferred DA mode).
As the MacPayIndex and NetPayIndex fields can point
anywhere in the frame (within the range of pointer rep-
resentation), it is the arbitrary choice of the application
weather the Nonce and the Security Suite is included in
the frame or not.
1:0
SecLayer
(2 bits)
DS70005023B-page 174
Preliminary
 2015 Microchip Technology Inc.