參數(shù)資料
型號: L64780
廠商: LSI Corporation
英文描述: DVB-T COFDM Demodulator(對地數(shù)字視頻廣播 正交編碼頻率分割多路處理解調器)
中文描述: 的DVB - T COFDM解調器(對地數(shù)字視頻廣播正交編碼頻率分割多路處理解調器)
文件頁數(shù): 40/126頁
文件大?。?/td> 953K
代理商: L64780
3-4
Interfaces
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 (
Figure 3.6
). The DVOUT signal is
deasserted during the scattered pilots, unused carriers, and guard
interval.
Figure 3.6
Nonhierarchical, Parallel Mode, 64 QAM Constellation
When a 16 QAM constellation is used, DVOUT is asserted for two
54 MHz clock cycles in six clock cycles (
Figure 3.7
). When QPSK is
used, it is asserted for only one out of six clock cycles (
Figure 3.8
).
Figure 3.7
Nonhierarchical, Parallel Mode, 16 QAM Constellation
Figure 3.8
Nonhierarchical, Parallel Mode, QPSK Constellation
CLKOUT54
SD00
SD01
SD02
SD10
SD11
SD12
SD03
SD04
SD05
SD13
SD14
SD15
SD0[3:0]
SD1[3:0]
DVOUT
CLKOUT54
SD00
SD01
SD10
SD11
SD02
SD03
SD12
SD13
SD0[3:0]
SD1[3:0]
DVOUT
CLKOUT54
SD10
SD01
SD11
SD00
SD0[3:0]
SD1[3:0]
DVOUT
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