AT86RF231
Received frames with a frame length field set to 0x00 (invalid PHR) are not signaled to the
microcontroller.
Table 8-1 on page 80 summarizes the type of payload versus the frame length value.
Table 8-1.
Frame Length Field - PHR
Frame Length Value
0-4
5
6-8
9 - aMaxPHYPacketSize
Payload
Reserved
MPDU (Acknowledgement)
Reserved
MPDU
8.1.2
MAC Protocol Layer Data Unit (MPDU)
Figure 8-2 on page 80 shows the frame structure of the MAC layer.
Figure 8-2.
IEEE 802.15.4 Frame Format - MAC-Layer Frame Structure (MPDU)
MAC Protocol Data Unit (MPDU)
FCF
Sequence
Number
Addressing Fields
MAC Header (MHR)
MAC Payload
MAC Service Data Unit (MSDU)
FCS
(MFR)
Destination
PAN ID
Destination
address
Source
PAN ID
Source
address
Auxiliary Security Header
CRC-16
0/4/6/8/10/12/14/16/18/20 octets
0/5/6/10/14 octets
2 octets
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Frame Type
Sec.
Enabled
Frame
Pending
ACK
Request
Intra
PAN
Reserved
Destination
addressing mode
Frame Version
Source
addressing mode
Frame Control Field 2 octets
8.1.2.1
8.1.2.2
Figure 8-3.
MAC Header (MHR) Fields
The MAC header consists of the Frame Control Field (FCF), a sequence number, and the
addressing fields (which are of variable length, and can even be empty in certain situations).
Frame Control Field (FCF)
The FCF consists of 16 bits, and occupies the first two octets of the MPDU or PSDU,
respectively.
IEEE 802.15.4-2006 Frame Control Field (FCF)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Frame Type
Sec.
Enabled
Frame
Pending
ACK
Request
Intra
PAN
Reserved
Destination
addressing mode
Frame Version
Source
addressing mode
Frame Control Field 2 octets
80
8111C–MCU Wireless–09/09
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