3.4.3.2.1.4 DMDRB –
Demodulator Data Rate on Path B
The target symbol rate for the receiving path B is configured in this register. This
register must only be modified if the block receiving the settings is disabled
(RDPR.PRPTB = 1). Modifying the settings during operation may lead
to unstable operation.
Name:
DMDRB
Offset:
0x0A7
Reset:
0x00
Bit
7
6
5
4
3
2
1
0
DMDNB[3:0]
DMAB[3:0]
Access
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Reset
0
0
0
0
0
0
0
0
Bits 7:4 – DMDNB[3:0] Demodulator
Down-Sampling on Path B
Selects the down-sampling and
cut-off frequency of the first stage of the data filter.
Table 3-17. DMDNB Setting versus
Amplitude Threshold Scaling on Path B (ATSCAL_B)
DMDNB
ATSCAL_B
0
1
1
1
2
2
3
2
4
4
5
4
6
8
7
8
8
16
The recommended down-sampling for a target symbol rate
is:
If the result is -1, set DMDNB =
0.
Equation parameters:
SymbolRatePathB:
Maximum expected symbol rate in Hz on the useful signal for path
B
CLK_BB: Baseband
clock frequency in Hz. See equation (13) in the section Bandwidth Scaling
ld(): Logarithm
to the base 2
Bits 3:0 – DMAB[3:0] Demodulator Moving
Average Data Rate Factor on Path B
Selects the moving average
filter length for the data filter and initial data rate for the clock recovery on
path B.
Table 3-16. DMAB Setting versus
Moving Average Filter Length and Symbol Rate Factor on Path B (MAVFL_B,
SR_F_B)
DMAB
MAVFL_B
SR_F_B
0
12
10
1
11
11
2
10
12
3
9
13
4
9
14
5
8
15
6
8
16
7
7
17
8
7
18
9
6
19
10
6
20
11
6
21
12
5
22
13
5
24
14
4
26
15
4
28
The recommended settings for this register are provided by the
configuration tool after selecting the desired target data rate for path B.
Symbol Rate Factor can also be calculated using the following equation. Use the
corresponding value for DMAB from the preceding table.
Equation 3-1. Symbol Rate
Factor
Equation parameters:
SymbolRatePathB:
Maximum expected symbol rate in Hz on the useful signal for path
B
CLK_BB: Baseband
clock frequency in Hz. See equation (13) in the section Bandwidth Scaling
SR_F_B: Must be
in the range of 10 to 28, if possible 10 to 19
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