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SX1210
ADVANCED COMMUNIC ATIONS & SENSING
IRQ source
1
0
B
B+1
# of bytes in FIFO
Rx & Stby
Figure 25: FIFO Threshold IRQ Source Behavior
5.2.2.4. FIFO Clearing
Table 14 below summarizes the status of the FIFO when switching between different modes
Table 14: Status of FIFO when Switching Between Different Modes of the Chip
From
Stby
Rx
Any
To
Rx
Stby
Sleep
FIFO Status
Cleared
Not cleared
Cleared
Comments
In Packet & Buffered modes FIFO can be read in Stby after Rx
5.2.3. Sync Word Recognition
5.2.3.1. Overview
Sync word recognition (also called Pattern recognition in previous products) is activated by setting
RXParam_Sync_on. The bit synchronizer must also be activated.
The block behaves like a shift register; it continuously compares the incoming data with its internally programmed
Sync word and asserts the Sync IRQ source on each occasion that a match is detected. This is illustrated in Figure
26.
Rx DATA
(NRZ)
Bit N-x =
Sync_value[x]
Bit N-1 = Bit N =
Sync_value[1] Sync_value[0]
DCLK
SYNC
Figure 26: Sync Word Recognition
During the comparison of the demodulated data, the first bit received is compared with bit 7 (MSB) of byte at
address 22 and the last bit received is compared with bit 0 (LSB) of the last byte whose address is determined by
the length of the Sync word.
Rev 2– Sept 8 , 2008
th
Page 33 of 73
www.semtech.com
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