SI2107-X-FM SILABS [Silicon Laboratories], SI2107-X-FM Datasheet - Page 74

• Manufacturer Part Number: SI2107-X-FM
• Description: SATELLITE RECEIVER FOR DVB-S/DSS WITH QUICKLOCK AND QUICKSCAN
• Manufacturer: SILABS [Silicon Laboratories]

Si2107/08/09/10
Register 93h. Inband Power Threshold Register (Si2109 and Si2110 only)
Register 94h. Noise Level Margin Threshold Register (Si2109 and Si2110 only)
Register A0h. Viterbi Search Control 1
74
Name
Name
Bit
7:0
Name
Bit
7:0
Bit
Bit
Bit
7:6
5:0
Bit
REF_NOISE_MARGIN[7:0] Power level threshold for the detection of channels.
THRESHOLD[7:0]
INBAND_
D7
Name
D7
D7
0
Name
VTCS[5:0]
Reserved
Name
D6
D6
Threshold for determining the drop in power in a channel as the LSA scans a
detected channel to determine the channel bandwidth.
Refer to Silicon Laboratories application note AN298 for recommended default val-
ues for QuickLock/QuickScan operation.
D6
0
Refer to Silicon Laboratories application note AN298 for recommended
default values for QuickLock/QuickScan operation.
Program as shown above.
Viterbi Code Rate Search Parameter Enable.
The code rates to be used in the Viterbi search are selected by writing a
one into the appropriate bit position. The list below illustrates the rela-
tionship between bit position and code rate.
Bit 5 = 7/8 code rate (MSB)
Bit 4 = 6/7 code rate
Bit 3 = 5/6 code rate
Bit 2 = 3/4 code rate
Bit 1 = 2/3 code rate
Bit 0 = 1/2 code rate (LSB)
Default: All code rates selected (3Fh).
D5
D5
D5
Preliminary Rev. 0.81
REF_NOISE_MARGIN[7:0]
INBAND_THRESHOLD
D4
D4
D4
Function
D3
D3
D3
Function
VTCS[5:0]
Function
D2
D2
D2
D1
D1
D1
D0
D0
D0