MRF24XA_15 Datasheet, PDF (155/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

MRF24XA
Figure 5-11 illustrates the construction of the Nonce in
802.15.4-mode.
FIGURE 5-11:
IEEE.802.15.4™ SECURITY CONTROL FIELDS
MHR: MAC Header (IEEE 802.15.4™)
FrameCtrl
(2 octets)
Sequence
(1 octet)
DestPID
DestAddr
(0/2 octets) (0/2/8 octets)
Destination (0/4/10 octets)
SrcPID
(0/2 octets)
SrcAddr
(0/2/8 octets)
Source(0/2/4/8/10 octets)
AuxSecHdr
(0-14 octets)
FrameCtrl (IEEE 802.15.4 2003)
7
6
Byte 0
5
4
3
2:0
Rsvd. PIDCmp
(1 bit) (1 bit)
0
x
AckReq
(1 bit)
x
FramePend SecEn
(1 bit) (1 bit)
x
1/0
Type
(3 bits)
Beacon/
Data/
Command
7:6
SAMode
(2 bits)
xx
Byte 1
5:4
3:2
FrameVer DAMode
(2 bits)
(2 bits)
2003-00 /
2006-01
xx
1:0
Rsvd.
(2 bits)
00
SecCtr
1 octet
FrameCnt
4 octets
AuxSecHdr (IEEE 802.15.4™–2006)
KeySrc
0/4/8 octets
KeyIndex
0/1 octet
AuxSecHdr (IEEE 802.15.4™–2003)
FrameCnt
4 octets
KeySeqCnt
1 octet
SecCtr (IEEE 802.15.4)
7:5
4:3
2:0
Reserved KeyIDMode SecLvl
(3 bits) (2 bits) (3 bits)
KeyIDMode
KeySrc
# Octets
00
0
01
0
10
4
11
8
KeyIDMode
KeyIndex
# Octets
00
0
01,10,11
1
NONCE<103:0>
8-byte SrcAddr
SECSUITE<2:0> in MACCON2
(SECSUITE<3> 0)
 2015 Microchip Technology Inc.
Preliminary
DS70005023C-page 155