MRF24J40 datasheet(21/66 Pages) MICROCHIP

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Advance Information

DS39776A-page 19

MRF24J40

5.0

IEEE 802.15.4™-2003

5.1

Overview

Before discussing the use of the MRF24J40, it may be

helpful to review the structure of a typical data frame.

Users requiring more information should refer to the

IEEE 802.15.4 Standard.

5.2

Packet Format

Normal IEEE 802.15.4 compliant packets are between 5

and 127 bytes long. They are made up of several possi-

ble fields: destination address information, source

address information, a length field, data payload and a

Cyclic Redundancy Check (CRC). Additionally, a 4-byte

preamble field and Start-of-Frame Delimiter (SFD) byte

are appended to the beginning of the packet. Thus, traffic

seen on the air will appear as shown in Figure 5-1.

FIGURE 5-1:

PACKET FORMAT

Number

Bytes

Preamble

Field

Comments

SFD

Packet Length

Frame Control

Destination

Address

Information

0/4/10

Source Address

Information

0/2/4/8/

Sequence Number

Data Payload

0-122

FCS

Frame check sequence – CRC

Used to

FCS

Filtered

out by

module

Start-of-Frame

delimiter – Filtered

out by module

Short or long address of the destination

device plus the PAN identifier.

Length selected in the frame control.

Short or long address of the source

device plus the PAN identifier.

Length selected in the frame control.

Used to calculate

packet length

calculate

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