MRF24XA_15 Datasheet, PDF (156/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

MRF24XA
FIGURE 5-12:
802.15.4 CCM NONCE (ONLY MAC LAYER SECURITY)-2006
63:56
55:48
47:40 39:32
SrcAddr
(8 Octets)
31:24 23:16 15:8
7:0 31:24
FrameCtr
(4 Octets)
23:16
15:8 7:0 7:0
{5'b00000, SecLvl}
(1 Octet)
13 Octets
Note:
The originator device automatically fills in SrcAddr field using the values of registers ADDR8
through ADDR1 irrespective of the SAMode. The recipient host must fill in the nonce if
SAMode is different from ‘11’.
FIGURE 5-13:
802.15.4 CCM NONCE (ONLY MAC LAYER SECURITY)-2003
7:0 15:8 23:16 _31:24 39:32
SrcAddr
(8 Octets)
47:40 55:48
63:56
7:0 15:8
FrameCtr
(4 Octets)
23:16
31:24 7:0
KeySeqCnt
(1 Octet)
13 Octets
Note:
The originator device automatically fills in SrcAddr field using the values of registers ADDR8
through ADDR1 irrespective of the SAMode. The recipient host must fill in the nonce if
SAMode is different from ‘11’.
DS70005023C-page 156
Preliminary
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