CC2510FX Datasheet, PDF (195/244 Pages) List of Unclassifed Manufacturers – True System-on-Chip with Low Power RF Transceiver and 8051 MCU

receiver. With CC2510Fx/CC2511Fx, this can be
done
automatically
by
setting
PKTCTRL0.WHITE_DATA=1. All data, except
the preamble and the sync word, are then
XOR-ed with a 9-bit pseudo-random (PN9)
sequence before being transmitted as shown
in Figure 49. At the receiver end, the data are
XOR-ed with the same pseudo-random
C2510Fx / CC2511Fx
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 49: Data Whitening in TX Mode
14.8.2 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 50: Packet Format
SWRS055D
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