L64780 LSI Logic Corporation, L64780 Datasheet - Page 42

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

Figure 3.11 Hierarchical, Two FEC Decoders, 64 QAM Constellation
DVOUT_LP
3.1.2.2 Decoding Only One Stream (HP or LP)
3-6
CLKOUT54
SD0[3:0]
SD1[3:0]
DVOUT
SD00 SD01
SD10
When in 64 QAM mode, two soft decisions are transmitted on SD0 and
four soft decisions are transmitted on SD1. The DVOUT signal stays
asserted during two 540 MHz clock cycles over six 54 MHz clock cycles
and the DVOUT_LP signal stays asserted for four of six 54 MHz clock
cycles. See
In this mode, the output port of the L64780 is configured
The DOF_HPLP signal selects between the HP and LP output streams.
The data stream in this output format is the same as for the
nonhierarchical case.
Figure 3.12 Output Interface in Hierarchical and One FEC Mode
* When not used, the signal is deasserted LOW.
Interfaces
SD11
L64780
SD12 SD13
Figure
3.11.
4
4
SD0 (HP/LP Stream)
DVOUT
SD1 (not used
DVOUT_LP (not used
CLKOUT54
SD02
SD14
*
)
SD03
SD15
*
)
SD16 SD17
(Figure
3.12).