CC2510Fx / CC2511Fx
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,
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).
Figure 50: Data Whitening in TX Mode
13.8.2 Packet Format
• Length byte or constant programmable
packet length
The format of the data packet can be
configured and consists of the following items:
• Optional Address byte
• Payload
• Preamble
• Synchronization word
• Optional 2 byte CRC
Optional data whitening
Legend:
Optionally FEC encoded/decoded
Optional CRC-16 calculation
Inserted automatically in TX,
processed and removed in RX.
Optional user-provided fields processed in TX,
processed but not removed in RX.
Preamble bits
(1010...1010)
Data field
8 x n bits
Unprocessed user data (apart from FEC
and/or whitening)
8
8
8 x n bits
16/32 bits
16 bits
bits bits
Figure 51: Packet Format
SWRS055F
Page 191 of 241
TI [ TEXAS INSTRUMENTS ]
