L64780 LSI Logic Corporation, L64780 Datasheet - Page 73

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

DDFS_DISABLE
DDFS_MODE
Parameter Registers
The initial condition for these bits is 0b00.
DDFS Disable
This bit determines if the DDFS performs the Baseband
correction (0) or not (1). The initial condition for the
DDFS_DISABLE is the Normal Operational Mode (0).
DDFS Start Pulse Selector
If this bit is 0, the DDFS block gets its START Pulse
(pulse delimiting every COFDM symbol) from the Timing
Recovery Unit Block; if this bit is 1, the DDFS block gets
its START Pulse from the MUXIN Block.
The initial condition value for the DDFS_MODE bit is 0.
The DDFS block can operate in four modes, as listed in
Table
Table 4.2
Hierarchical
DDFS
Mode
When in Hierarchical mode with two FEC chips, HP
and LP streams are presented on SD0 and SD1,
respectively.
X
X
0
1
YES
YES
YES
NO
NO
4.2.
Muxin
DDFS
DDFS Block Modes
DOF_OUTPUT_
FORMAT[1:0]
X
0
1
1
X
X
X
0
1
Disable Functional Mode
DDFS
0
1
0
0
1
0
0
0
1
Definition
Serial Mode
Parallel Mode
HP stream over SD0, 1 FEC
Mode
LP stream over SD0, 1 FEC
Mode
HP over SD0, LP over SD1,
Two FEC Mode
Normal
Test
Down-Converter Off-Chip
Disable Mode
R/W 2
R/W 1
4-21