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.
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
Data whitening can only be used when
PKTCTRL0.CC2400_EN=0(default).
Figure 49: Data Whitening in TX Mode
14.8.2
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
Optionally FEC encoded/decoded
Optional CRC-16 calculation
Legend:
Inserted automatically in TX,
processed and removed in RX.
Optional user-provided fields processed in TX,
processed but not removed in RX.
Preamble bits
Data field
(1010...1010)
Unprocessed user data (apart from FEC
and/or whitening)
8
8
8 x n bits
16/32 bits
8 x n bits
16 bits
bits bits
Figure 50: Packet Format
SWRS055D
Page 195 of 243
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