L64780 LSI Logic Corporation, L64780 Datasheet - Page 40

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

Figure 3.6
CLKOUT54
Figure 3.7
Figure 3.8
CLKOUT54
3-4
CLKOUT54
SD0[3:0]
SD1[3:0]
SD0[3:0]
SD1[3:0]
SD0[3:0]
SD1[3:0]
DVOUT
DVOUT
DVOUT
Nonhierarchical, Parallel Mode, 64 QAM Constellation
Nonhierarchical, Parallel Mode, 16 QAM Constellation
Nonhierarchical, Parallel Mode, QPSK Constellation
SD00
SD10
SD00
SD10
SD00
SD10
Because soft decisions are presented in parallel in 64 QAM, the soft
decisions are presented in three consecutive 54 MHz clock cycles over
a six 54 MHz clock cycle period
deasserted during the scattered pilots, unused carriers, and guard
interval.
When a 16 QAM constellation is used, DVOUT is asserted for two
54 MHz clock cycles in six clock cycles
used, it is asserted for only one out of six clock cycles
Interfaces
SD01
SD11
SD01
SD11
SD02
SD12
(Figure
SD11
SD01
SD03
SD13
SD02
SD12
(Figure
3.6). The DVOUT signal is
SD04 SD05
SD14 SD15
SD03
SD13
3.7). When QPSK is
(Figure
3.8).