nRF24E1 Nordic VLSI, nRF24E1 Datasheet - Page 33

• Manufacturer Part Number: nRF24E1
• Description: 2.4Ghz RF Transceiver With Embedded 8051 Compatible Microcontroller And 9 Input, 10 Bit ADC
• Manufacturer: Nordic VLSI

PRODUCT SPECIFICATION
Figure 4-9 Data Package Diagram
The data packet for both ShockBurst™ mode and direct mode communication is
divided into 4 sections. These are:
Table 4-15 Data package description
Nordic VLSI ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Revision: 1.0
PRE-AMBLE
ADDRESS
PREAMBLE
and is not used in Direct mode.
The preamble field is required in ShockBurst™ and Direct modes
Preamble is 8 (or 4) bits in length and is dependent of the first data bit of
the address.
Preamble is automatically added to the data packet in ShockBurst™ and
thereby gives extra space for payload.
In ShockBurst™ mode the preamble is stripped from the received output
data, in direct mode the preamble is transparent to the output data.
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 CPU 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).
In Direct mode the payload size is defined by 1Mbps for 4ms: 4000 bits
minus the following: (Preamble: 8 (or 4) bits. + Address: 8 to 40 bits. +
CRC: 0, 8 or 16 bits).
The CRC is optional in ShockBurst™ mode,
8 or 16 bits length
The CRC is stripped from the received output data.
01010101
10101010
QhtrÃ""ÂsÃ(&
PAYLOAD
1
st
ADDR-BIT
0
1
CRC
July 2003