MRF24J40_08 Datasheet, PDF (6/152 Pages) Microchip Technology – IEEE 802.15.4™ 2.4 GHz RF Transceiver

MRF24J40
1.1 IEEE 802.15.4-2003 Standard
The MRF24J40 is compliant with the
IEEE 802.15.4™-2003 Standard. The Standard speci-
fies the physical (PHY) and Media Access Controller
(MAC) functions that form the basis for a wireless net-
work device. Figure 1-2 shows the structure of the PHY
packet and MAC frame.
It is highly recommended that the design engineer be
familiar with the IEEE 802.15.4-2003 Standard in order
to best understand the configuration and operation of the
MRF24J40. The Standard can be downloaded from the
IEEE web site: http://www.ieee.org.
FIGURE 1-2:
IEEE 802.15.4™ PHY PACKET AND MAC FRAME STRUCTURE
MAC Sublayer
Acknowledgment
Frame
2
1
Frame Sequence
Control ^Number
MHR
2
FCS
MFR
octets
MAC Sublayer
Data
Frame
2
1
4 to 20
Frame Sequence
Control ^Number
Adressing
Fields
MHR
MAC Sublayer
MAC Command
Frame
2
1
4 to 20
Frame Sequence
Control ^Number
Adressing
Fields
MHR
MAC Sublayer
Beacon
Frame
2
1
4 or 10
Frame Sequence
Control ^Number
Adressing
Fields
MHR
PHY Layer
4
1
Preamble SFD
SHR
1
Frame
Length
PHR
n
Data Payload
MSDU
1
Command
Type
n
Command Payload
MSDU
2
Superframe
Specification
k
GTS
Fields
m
Pending
Address
Fields
MSDU
n
Beacon Payload
5 – 127
PSDU
PHY Payload
2
FCS
MFR
octets
2
FCS
MFR
octets
2
FCS
MFR
octets
octets
On air
packet
PPDU
DS39776B-page 4
Preliminary
© 2008 Microchip Technology Inc.