L64780 LSI Logic Corporation, L64780 Datasheet - Page 41

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

3.1.2 Output Format in Hierarchical Mode
3.1.2.1 Decoding of HP and LP Streams
Figure 3.10 Hierarchical, Two FEC Decoders, 16 QAM Constellation
DVOUT_LP
CLKOUT54
SD0[3:0]
SD1[3:0]
DVOUT
SD10 SD11
SD00 SD01
The following subsections describe the decoding of High-Priority and
Low-Priority data streams in hierarchical mode.
In hierarchical mode, the output port of the L64780 is configured
(Figure
and SD1, respectively. DVOUT validates the High-Priority data stream;
DVOUT_LP validates the Low-Priority data stream.
Figure 3.9
When in 16 QAM mode, two soft decisions are transmitted on SD0 and
SD1. DVOUT and DVOUT_LP stay asserted for two of six 54 MHz clock
cycles. See
Output Interface
L64780
3.9). The High- and Low-Priority streams are delivered on SD0
Figure
Output Interface in Hierarchical and Two FECs Modes
3.10.
4
4
SD0 (High-Priority Stream)
DVOUT
SD1 (Low-Priority Stream)
DVOUT_LP
CLKOUT54
SD12 SD13
SD02 SD03
3-5