CC2510_15 Datasheet, PDF (191/245 Pages) Texas Instruments – Low-Power SoC (System-on-Chip) with MCU, Memory,2.4 GHz RF Transceiver, and USB Controller

CC2511F8 - Not Recommended for New Designs
XOR-ed with a 9-bit pseudo-random (PN9)
sequence before being transmitted as shown
in Figure 50. At the receiver end, the data are
XOR-ed with the same pseudo-random
sequence. This way, the whitening is reversed,
CC2510Fx / CC2511Fx
and the original data appear in the receiver.
The PN9 sequence is reset to all 1’s.
Data whitening can only be used when
PKTCTRL0.CC2400_EN=0 (default).
8
7
6
5
4
3
2
1
0
TX_DATA
7
6
5
4
3
2
1
0
The first TX_DATA byte is shifted in before doing the XOR-operation providing the first TX_OUT[7:0] byte. The
second TX_DATA byte is then shifted in before doing the XOR-operation providing the second TX_OUT[7:0] byte.
Figure 50: Data Whitening in TX Mode
TX_OUT[7:0]
13.8.2 Packet Format
The format of the data packet can be
configured and consists of the following items:
• Preamble
• Synchronization word
• Length byte or constant programmable
packet length
• Optional Address byte
• Payload
• Optional 2 byte CRC
Preamble bits
(1010...1010)
Optional data whitening
Optionally FEC encoded/decoded
Optional CRC-16 calculation
Data field
8 x n bits
16/32 bits
8
bits
8
bits
8 x n bits
16 bits
Legend:
Inserted automatically in TX,
processed and removed in RX.
Optional user-provided fields processed in TX,
processed but not removed in RX.
Unprocessed user data (apart from FEC
and/or whitening)
Figure 51: Packet Format
SWRS055G
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