L64780 LSI Logic Corporation, L64780 Datasheet - Page 71

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

4.4.2 Address Lines 0x06, 0x07, 0x08
AFC_INIT_FRQ
Parameter Registers
0x06
0x07
0x08
7
The values in Analog AFC loop mode are:
The initial condition for these bits is 0b110, or
AFC Initial Frequency Offset
These three 8-bit registers select the Initial Frequency
Offset that is directed towards the Tuner or the DDFS
block.
The initial condition for these registers is 0.
AFC_SENSITIVITY[2:0]
K
When these registers are read, the resultant value
represents the actual Frequency Offset (for example,
the content of the integrator) recovered by the system.
When this register is written, the resultant value rein-
itializes the Integrator value.
Three OBC accesses are necessary to update these
registers; thus, you should first stall the Integrator by
setting AFC_STALL to 1, then update the values. You
can reactivate the integrator by resetting AFC_STALL
to 0.
0
0
0
0
1
1
1
1
SENS
1.56
0
0
1
1
0
0
1
1
AFC_INIT_FRQ_MSB
10
AFC_INIT_FRQ_CSB
AFC_INIT_FRQ_LSB
–
2
.
0
1
0
1
0
1
0
1
Definition
K
K
K
K
K
K
K
K
SENS
SENS
SENS
SENS
SENS
SENS
SENS
SENS
2.44
4.88
9.8
1.95
3.9
7.8
1.56
3.1
10
10
10
10
10
10
10
10
–
–
–
–
4
3
3
2
–
–
–
–
4
4
3
2
R/W [7:0]
0
4-19