參數(shù)資料
型號(hào): L64780
廠商: LSI Corporation
英文描述: DVB-T COFDM Demodulator(對地?cái)?shù)字視頻廣播 正交編碼頻率分割多路處理解調(diào)器)
中文描述: 的DVB - T COFDM解調(diào)器(對地?cái)?shù)字視頻廣播正交編碼頻率分割多路處理解調(diào)器)
文件頁數(shù): 41/126頁
文件大小: 953K
代理商: L64780
Output Interface
3-5
3.1.2 Output Format in Hierarchical Mode
The following subsections describe the decoding of High-Priority and
Low-Priority data streams in hierarchical mode.
3.1.2.1 Decoding of HP and LP Streams
In hierarchical mode, the output port of the L64780 is configured
(
Figure 3.9
). The High- and Low-Priority streams are delivered on SD0
and SD1, respectively. DVOUT validates the High-Priority data stream;
DVOUT_LP validates the Low-Priority data stream.
Figure 3.9
Output Interface in Hierarchical and Two FECs Modes
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
Figure 3.10
.
Figure 3.10 Hierarchical, Two FEC Decoders, 16 QAM Constellation
SD0 (High-Priority Stream)
DVOUT
CLKOUT54
L64780
SD1 (Low-Priority Stream)
DVOUT_LP
4
4
CLKOUT54
SD02
SD03
SD12
SD13
SD00
SD01
SD10
SD11
SD0[3:0]
SD1[3:0]
DVOUT
DVOUT_LP
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