L64724 LSI Logic Corporation, L64724 Datasheet - Page 251

• Manufacturer Part Number: L64724
• Description: Satellite Receiver
• Manufacturer: LSI Logic Corporation

Group 4, APR 34–35 – Set to 0x1110.
The value for the upper sweep limit, CAR_USWL[15:0], is set as
explained in the following paragraphs. It should be noted that the upper
sweep limit is an approximate value but the approximation to the real
sweep limit is accurate enough. Assume that the upper sweep limit
needed is + 2 MHz. Calculate CAR_USWL[15:0] as shown in
B.48
Equation B.48
Equation B.49
Set Group 4, APR 35 to 0x08 and APR 34 to 0x88.
Group 4, APR 36–37 – Set to 0xEEFD.
The value for the lower sweep limit, CAR_LSWL[15:0], is set as
explained in the following paragraphs. It should be noted that the lower
sweep limit is an approximate value but the approximation to the real
sweep limit is accurate enough. Assume that the lower sweep limit
needed is
B.50
Equation B.50
Equation B.51
Set Group 4, APR 37 to0xF7 and APR 36 to 0x78.
QPSK Demodulator and FEC Configuration Example: Low Data Rates
CAR_USWL
CAR_LSWL
CAR_USWL
CAR_LSWL
and
and
Equation
Equation
2 MHz. Calculate CAR_LSWL[15:0] as shown in
=
=
=
=
---------------------------------------------- -
60 10
2
----------------------------------------------
2
----------------------------------------------
---------------------------------------------- -
60 10
37
2
37
37
B.49.
2
B.51.
37
F s
F s
sweeplimit
sweeplimit
–
6
6
2 10
2
2
2
1 2
1 2
21
21
10
6
6
21
21
=
=
–
2184
2184
(0x0888)
(0xF778)
Equation
Equation
B-37