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MRF89XA датащи(PDF) 86 Page - Microchip Technology

номер детали MRF89XA
подробное описание детали  Ultra Low-Power, Integrated ISM BandSub-GHz Transceiver
Download  140 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MRF89XA датащи(HTML) 86 Page - Microchip Technology

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MRF89XA
DS70000622D-page 86
Preliminary
 2010-2017 Microchip Technology Inc.
3.11.4
DC-FREE DATA MECHANISMS
The payload to be transmitted may contain long
sequences of ‘1’s and ‘0’s. These continuous
sequences introduce a DC bias in the transmitted
signal, which causes a non-uniform power distribution
spectrum over the occupied channel bandwidth. These
sequences also degrade the performance of the
demodulation and data, and clock recovery functions in
the receiver, which could further introduce data
dependencies in the normal operation of the
demodulator. System performance can be enhanced if
the payload bits are randomized to reduce DC biases
and increase the number of bit transitions. Therefore, it
is useful if the transmitted data is random and DC-free.
To handle such instances, two techniques are available
in the packet handler: Manchester encoding and Data
Whitening. However, only one of the two methods
should be enabled at a time.
3.11.4.1
Manchester Data Encoding
Manchester encoding/decoding is enabled by setting
the MCHSTREN bit (PLOADREG<7>) and can be
used in Packet mode only. The NRZ data is converted
to Manchester code by coding ‘1’ as ‘10’ and ‘0’ as ‘01’.
Figure 3-29 illustrates Manchester data encoding. NRZ
data is converted to Manchester by encoding the 1 bits
as 10 chip sequences, and the 0 bits as 01 chip
sequences. Manchester encoding guarantees DC-
balance and frequent data transitions in the encoded
data. The maximum Manchester chip rate corresponds
to the maximum bit rate given in the Transmitter
Electrical specifications in Table 5-6.
In this case, the maximum chip rate is the maximum bit
rate given in the specifications section and the actual
bit rate is half the chip rate. Manchester encoding and
decoding is only applied to the payload and CRC
checksum while the preamble and Sync Word are kept
NRZ. However, the chip rate from the preamble to CRC
is the same and defined by the BRVAL<6:0> bits
(BRSREG<6:0>) (Chip Rate = Bit Rate NRZ = 2 x Bit
Rate Manchester).
Therefore, Manchester encoding or decoding is made
transparent to the user who still provides or retrieves
NRZ data to or from the FIFO. See the Manchester
encoding or decoding bit pattern in Figure 3-30.
3.11.4.2
Data Whitening
Another technique called data 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 dewhitened on
the RX side using the same sequence. Compared to
the Manchester technique, it has the advantage of
retaining the NRZ data rate (that is, actual bit rate is not
halved).
The whitening or dewhitening process is enabled by
setting the WHITEN1 bit (PKTCREG<4>). A 9-bit
Linear Feedback Shift Register (LFSR) is used to
generate a random sequence. The payload and 2-byte
CRC checksum is then XORed with this random
sequence as illustrated in Figure 3-31. The data is
dewhitened on the receiver side by XORing with the
same random sequence.
Payload whitening or dewhitening is made transparent
to the user who still provides or retrieves NRZ data to
or from the FIFO.
FIGURE 3-29:
MANCHESTER DATA ENCODING
FIGURE 3-30:
MANCHESTER ENCODING/DECODING
...Sync
Payload...
RF chips @ BR
...
1
1
1
0
1
0
0
1
0 0
1
0
1
1 0
1
0
...
User/NRZ bits
Manchester OFF
...
1
1
1
0
1
0
0
1
0 0
1
0
1
1 0
1
0
...
User/NRZ bits
Manchester ON
...
1
1
1
0
1
0
0
1 0
0 1
1
...
t
1/BR 1/
BR


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