CC1150-RTR1 datasheet(20/67 Pages) TI1

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Preamble bits

(1010...1010)

Data field

Optional CRC-16 calculation

Optionally FEC encoded/decoded

Optional data whitening

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)

8 x n bits

16/32

bits

8 x n bits

16 bits

TX_OUT[7:0]

TX_DATA

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.

CC1150

SWRS037B – JANUARY 2006 – REVISED MARCH 2015

www.ti.com

Real world data often contain long sequences of zeros and ones. Performance can then be improved by

whitening the data before transmitting, and de-whitening in the receiver. With CC1150, in combination with

a CC1101 at the receiver end, this can be done automatically by setting PKTCTRL0WHITE_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 5-7. The PN9 sequence is initialized to all ones. 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.

Setting PKTCTRL0.WHITE_DATA=1 is recommended for all uses, except when over-the-air compatibility

with other systems is needed.

Figure 5-7. Data Whitening in TX Mode

5.8.2

Packet Format

The format of the data packet can be configured and consists of the following items:

•

Preamble

•

Synchronization word

•

Optional length byte

•

Optional Address byte

•

Payload

•

Optional 2 byte CRC

Figure 5-8. Packet Format

Detailed Description

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