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8.1.1.3 PHY Payload (PHY Service Data Unit, PSDU)
The PSDU has a variable length between zero and aMaxPHYPacketSize (127,
maximum PSDU size in octets). The length of the PSDU is signaled by the frame length
field (PHR), refer to Table 8-1 . The PSDU contains the MAC Protocol Layer Data Unit
(MPDU).
Received frames with a frame length field set to zero (invalid PHR) are not signaled to
the microcontroller.
Table 8-1 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 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
PAN ID
Comp.
Reserved
Destination
addressing mode
Frame Version
Source
addressing mode
Frame Control Field 2 octets
8.1.2.1 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).
8.1.2.2 Frame Control Field (FCF)
The FCF consists of 16 bits, and occupies the first two octets of the MPDU or PSDU,
respectively.
80
AT86RF232
8321A – MCU Wireless – 10/11
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