RF63 datasheet(54/91 Pages) ETC2

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ADVANCED COMMUNICATIONS & SENSING

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RF63

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1/BR ...Sync

1/BR

Payload...

RF chips @ BR

...

User/NRZ bits

Manchester OFF

...

User/NRZ bits

Manchester ON

...

Manchester encoding and decoding is only applied to the payload and CRC checksum while preamble and Sync

word are kept NRZ. However, the chip rate from preamble to CRC is the same and defined by MCParam_BR (Chip

Rate = Bit Rate NRZ = 2 x Bit Rate Manchester).

Manchester encoding/decoding is thus made transparent for the user, who still provides/retrieves NRZ data to/from

the FIFO.

Figure 46: Manchester Encoding/Decoding

5.5.6.2. Data Whitening

Another technique called whitening or scrambling is widely used for randomizing the user data before radio

transmission. The data is whitened using a random sequence on the Tx side and de-whitened on the Rx side using

the same sequence. Comparing to Manchester technique it has the advantage of keeping NRZ datarate i.e. actual

bit rate is not halved.

The whitening/de-whitening process is enabled by setting bit PKTParam_Whitening_on. A 9-bit LFSR is used to

generate a random sequence. The payload and 2-byte CRC checksum is then XORed with this random sequence

as shown in Figure 47. The data is de-whitened on the receiver side by XORing with the same random sequence.

Payload whitening/de-whitening is thus made transparent for the user, who still provides/retrieves NRZ data to/from

the FIFO.

L F S R P o lyn o m ia l = X 9 + X 5 + 1

X 8

X 7

X 6

X 5

X 4

X 3

X 2

X 1

X 0

T ra n s m it d a ta

W h ite n e d d a ta

Figure 47: Data Whitening

5.5.7. Interrupt Signal Mapping

Tables below give the description of the interrupts available in Packet mode.

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