L64780 LSI Logic Corporation, L64780 Datasheet - Page 78

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

4-26
TIM_LOOP_P
TIM_IIRGAIN Timing IIR Filter Time Constant
Register Descriptions
Timing Gain Loop 1
These bits adjust the Timing Gain of the Loop Filter. The
value is set according to the sensitivity of the VXCO loop.
The initial condition for the TIM_LOOP_P is 0b011
(Gain 3)
These bits govern the amount of IIR Filtering done in the
Timing Loop Filter.
The initial condition for the TIM_IIRGAIN is 0b01 (Gain 1)
TIM_IIRGAIN[1:0]
3.125
0
0
0
0
1
1
1
1
0
0
1
1
TIM_LOOP_P[2:0]
10
–
K
2
P
.
0
0
1
1
0
0
1
1
1.0
0
1
0
1
.
Definition
0
1
0
1
0
1
0
1
1.56
7.8
3.125
6.25
Definition
K
K
K
K
K
K
K
K
10
10
P
P
P
P
P
P
P
10
P
–
10
3
–
–
2
2
–
8.0
4.0
2.0
1.0
0.5
0.25
0.125
6.25
2
10
–
2
R/W [4:2]
R/W [1:0]