5.4 Data Package Description
The data packet for both ShockBurstTM mode and direct mode communic ation is divided into 4
sections. These are:
PRE-AMBLE
ADDRESS
PAYLOAD
CRC
Figure 2 Data Package Diagram
Hereby is the information in detail about these 4 sections.
1. PREAMBLE
2. ADDRESS
3. PAYLOAD
4. CRC
The preamble field is required in ShockBurst and Direct
Mode
Preamble is 8 bits in length and is dependent of the first data bit in
direct mode.
PREAMBLE
1st ADDR-BIT
01010101
0
10101010
1
The address field is required in ShockBurst mode.
8 to 40 bits length.
Address automatically removed from received packet in
shockBurst mode. In Direct Mode MCU must handle address
The data to be transmitted
In Shock-Burst mode payload size is 256 bits minus the following:
(Address: 8 to 40 bits. + CRC 8 or 16 bits).
The CRC is optional in ShockBurst™ mode, and is not used in
Direct mode
8 or 16 bits length
The CRC is removed from the received output data in ShockBurst™ RX..
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TRW-24G Datasheet P.14