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XE1203F
Name
ADParam_Fix_bsync
Bit
s
7
Addres
s
10010
Description
bit synchronizer configuration:
0-> default configuration
1-> high-interference environment
ADParam_Sync_loss
6-0
10010
Number of bits before sync loss detection for Barker decoding
algorithm
Table 16: ADParam Configuration Register
5.2.7 Pattern register
This register holds the user supplied reference pattern of 8, 16, 24, or 32 bits (see the ADParam_Psize parameter).
The first byte of this pattern is always stored in the byte at address A[4:0] = 10011. If used, the 2 nd byte is stored at
address A[4:0] = 10100, the 3 rd byte at address A[4:0] = 10101, and finally the 4 th byte at address A[4:0] = 01011.
The MSB bit of the reference pattern is always bit 7 of address 10011.
Comparing the demodulated data, the first bit received of the last word is compared with bit 7 (the MSB) of byte
address 10011. The last bit received is compared with bit 0 (the LSB) in the Pattern register.
Name
PATParam_Pattern
Bits
7-0
Byte Address
10011
10100
10101
10110
Description
1 st byte of the reference pattern
2 nd byte
3 rd byte
4 th byte
Table 17: PATParam Pattern Registers
Example of pattern recognition with a 32-bit pattern:
Byte Address
10011
Bit 7 Bit 0
10010011
Byte Address
10100
Bit 7 Bit 0
10101010
Byte Address
10101
Bit 7 Bit 0
10010011
Byte Address
10110
Bit 7 Bit 0
10101010
101
10010011
10101010
previous bits
demodulator
from
10010011
10101010
last bit received
Figure 16: Example of pattern recognition with a 32-bit pattern
Example of pattern recognition with an 8-bit pattern:
Byte Address
10011
Bit 7 Bit 0
10010011
101
10010011
previous bits from
Byte Address
10100
Bit 7 Bit 0
Xxxxxxxx
last bit received
Byte Address
10101
Bit 7 Bit 0
Xxxxxxxx
Byte Address
10110
Bit 7 Bit 0
Xxxxxxxx
demodulator
Figure 17: Example of pattern recognition with an 8-bit pattern
? Semtech 2008
27
www.semtech.com
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