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MRF24J40-I/T Datasheet(PDF) 98 Page - Microchip Technology

Part # MRF24J40-I/T
Description  IEEE 802.15.4??2.4 GHz RF Transceiver
PDF  156 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MRF24J40-I/T Datasheet(HTML) 98 Page - Microchip Technology

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MRF24J40
DS39776C-page 98
Preliminary
© 2010 Microchip Technology Inc.
3.8.1.1
Superframe Structure
The superframe structure is shown in Figure 3-4. A
superframe is bounded by the transmission of a
beacon frame and can have an active and inactive
portion. The coordinator will interact with its PAN only
during the active portion of the superframe, and during
the inactive portion of the superframe, the coordinator
can go to a low-power mode. The active portion of the
superframe is divided into 16 equally spaced slots and
is composed of three parts: a beacon, a Contention
Access Period (CAP) and an optional Contention Free
Period (CFP). The structure of the superframe depends
on the values of Beacon Order (BO) and Superframe
Order (SO). The CFP, if present, follows immediately
after the CAP and extends to the end of active portion
of the superframe. Any allocated GTSs shall be located
in the CFP of the active portion of the superframe.
All the frames transmitted in the CAP, except
Acknowledgement frames and data frames that imme-
diately follow the data request command, must use
slotted CSMA-CA. Refer to Section 3.9 “Carrier
Sense
Multiple
Access-Collision
Avoidance
(CSMA-CA) Algorithm” for more information.
FIGURE 3-4:
SUPERFRAME STRUCTURE
0
1
2
3
4
5
6
7
8
GTS1
G
T
S
2
GTS3
Inactive Portion
Active Portion
CAP
CFP
Slot
Backoff Period (aUnitBackoffPeriod = 20 symbols)
Inactive Portion
Beacon
GTS End Slots = ESLOTG23 (0x1E),
ESLOTG45 (0x1F), ESLOT67 (0x20)
Beacon
CAP End Slot = ESLOTG1 (0x13<3:0>)
01
2
3
456789 10 11 12 13 14 15
SD
Superframe Duration (SD) = aBaseSuperframeDuration * 2SO symbols
(SO – ORDER 0x10<3:0>)
BI
Beacon Interval (BI) = aBaseSuperframeDuration * 2BO symbols
(BO – ORDER 0x10<7:4>)



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