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XE1205
where OSR(7:0) is the content of the register; TParam_OSR(7:0) as described in section 7.2.8.
For a correct operation of the bit synchronizer, the value of this register must be higher or equal to 15 and
(int(OSR)+1) * Bit_rate should be inferior or equal to 4.87MHz.
5.2.3.3
Pattern recognition block in continuous mode
In receive mode this feature is activated by setting the RXParam_Pattern configuration register bit to high. The
demodulated signal is compared with a pattern stored in the Reg_pattern(31:0) registers. The PATTERN signal (mapped
to output pin IRQ_0) is driven by the output of this comparator and is synchronized by DCLK. It is set to high when a
matching condition is detected, otherwise set to low. PATTERN output is updated at the rising edge of DCLK. The
number of bits used for comparison is defined in the RXParam_Psize(1:0) register and the number of tolerated errors for
the pattern recognition is defined in the RXParam_Ptol(1:0) register. Figure 4, illustrates the pattern matching process.
DATA
(NRZ)
Bit N-x =
Reg_pattern[x]
Bit N-1 =
Reg_pattern[1]
Bit N =
Reg_pattern[0]
DCLK
PATTERN
Figure 4: Pattern matching operation.
Note: The pattern recognizer is available only if the bit synchronizer is enabled.
5.2.3.4
RSSI in continuous mode
This function provides a Received Signal Strength Indication based on the signal level at the output of the base-band
filter. To activate this function, the bit RXParam_RSSI must be set to “1”. When activated, the 2-bit status information is
stored in register RXParam_RSSI_OUT(1:0) and may be read through the serial control interface. The meaning of this
status information is given in the table below, where V RFFIL is the differential amplitude of the equivalent input RF signal
when the receiver is operated in mode A. The thresholds VTHRi are at the output of the base-band filter divided by the
gain between the input of the receiver and this output. When operated in mode B, equivalent VTHRi thresholds are
shifted 15dBm higher.
RXPARAM_RSSI_out(1:0)
00
01
10
11
Description
V RFFIL ≤ VTHR1
VTHR1 < V RFFIL ≤ VTHR2
VTHR2 < V RFFIL ≤ VTHR3
VTHR3 < V RFFIL
Table 7: RSSI status description
The operating range of the RSSI measurement may be changed by programming the RXParam_RSSI_range bit; in this
way two ranges with three VTHRi values may be selected. An additional way to increase RSSI operating range is to
combine modes A and B thresholds. One could then cover input signals ranging from -110dBm (VTHR1, low range,
mode A) up to -70dBm (VTHR3, high range, mode B)
? Semtech 2008
11
www.semtech.com
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