L64780 LSI Logic Corporation, L64780 Datasheet - Page 76

• Manufacturer Part Number: L64780
• Description: Dvb-t Cofdm Demodulator Technical Manual 2/00
• Manufacturer: LSI Logic Corporation

4.4.5 Address Line 0x0B
4-24
AGC_GAIN
ADC_FORMAT
R2C_SI
Register Descriptions
0x0B
ADC_FORMAT
7
AGC Loop Gain
These bits adjust the AGC Gain of the Loop Filter. The
value is set according to the sensitivity of the AGC loop.
The values are:
The initial condition for these bits is 0b011,
Format of ADC Output
This bit determines if the ADC outputs its values in two’s
complement (1) or in binary offset format (0). The initial
condition for the ADC_FORMAT bit is 0, binary offset.
COFDM Spectrum Inversion
During the up-conversion and the following down-
conversion, the COFDM spectrum can be inverted,
depending on the equipment used. This bit determines if
the COFDM signal should be spectrally inverted (1) or not
(0).
The initial condition for the R2C_SI bit is 0, normal
operation.
This spectrum inversion changes the sign of the sine
function (negative for 0, positive for 1).
0
0
0
0
1
1
1
1
AGC_GAIN[2:0]
R2C_SI
6
0
0
1
1
0
0
1
1
5
0
1
0
1
0
1
0
1
K
K
K
K
K
K
K
K
Definition
s
s
s
s
s
s
s
s
AGC_TARGET_MSB
3.9
9.8
2.4
6.1
1.5
3.8
9.5
2.4
10
10
10
10
10
10
10
10
–
–
–
–
–
–
–
–
3
4
4
5
5
6
7
7
K
s
R/W [2:0]
6.1
R/W 7
R/W 6
10
0
–
5
.