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CC2480
Bytes:
2
1
0 to 20
n
2
MAC
Layer
Frame
Control Field
(FCF)
Data
Sequence
Number
Address
Information
Frame payload
Frame Check
Sequence
(FCS)
MAC Header (MHR)
MAC Payload
MAC Footer
(MFR)
PHY
Layer
Bytes:
4
Preamble
Sequence
1
Start of frame
Delimiter
(SFD)
1
Frame
Length
5 + (0 to 20) + n
MAC Protocol
Data Unit
(MPDU)
Synchronisation Header
(SHR)
PHY Header
(PHR)
PHY Service Data Unit
(PSDU)
11 + (0 to 20) + n
PHY Protocol Data Unit
(PPDU)
Figure 13: Schematic view of the IEEE 802.15.4 Frame Format [1]
10.4 Synchronization header
The synchronization header (SHR) consists of
A synchronization
header
is
always
the preamble sequence followed by the start of
transmitted first in all transmit modes.
frame delimiter (SFD). In [1], the preamble
sequence is defined to be four bytes of 0x00.
The SFD is one byte, set to 0xA7.
10.5 MAC protocol data unit
In receive
sequence
frequency
used
mode CC2480 uses the preamble
for symbol synchronization and
offset adjustments. The SFD is
for byte synchronization.
The FCF, data sequence number and address
information follows the length field as shown in
Figure 13. Together with the MAC data
payload and Frame Check Sequence, they
form the MAC Protocol Data Unit (MPDU).
The format of the FCF is shown in Figure 14.
Please refer to [1] for details.
Bits: 0-2
Frame
Type
3
Security
Enabled
4
Frame
Pending
5
Acknowledge
request
6
Intra
PAN
7-9
Reserved
10-11
Destination
addressing
12-13
Reserved
14-15
Source
addressing
mode
Figure 14: Format of the Frame Control Field (FCF) [1]
10.6 Frame check sequence
mode
A 2-byte frame check sequence (FCS) follows
the last MAC payload byte as shown in Figure
13. The FCS is calculated over the MPDU, i.e.
the length field is not part of the FCS.
The FCS polynomial is [1]:
x 16 + x 12 + x 5 + 1
The CC2480 hardware implementation is
shown in Figure 15. Please refer to [1] for
further details.
In transmit mode the FCS is appended at the
correct position defined by the length field.
The most significant bit in the last byte of each
frame is set high if the CRC of the received
frame is correct and low otherwise.
Data
input
(LSB
first)
r0
r1
r2
r3
r4
r5
r6
r7
r8
r9
r10
r11
r12
r13
r14
r15
Figure 15: CC2480 Frame Check Sequence (FCS) hardware implementation [1]
CC2480 Data Sheet SWRS074
Page 32 of 43
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