參數(shù)資料
型號: 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): 39/126頁
文件大小: 953K
代理商: L64780
Output Interface
3-3
For a 16 QAM constellation, during which four soft decisions are
extracted every 9 MHz, the DVOUT signal stays asserted over four out
of six 54 MHz clock cycles. See
Figure 3.3
.
Figure 3.3
Nonhierarchical, Serial Mode, 16 QAM Constellation
For the QPSK constellation, only two soft decisions are extracted every
9 MHz, resulting in DVOUT being asserted over two out of six 54 MHz
clock cycles. See
Figure 3.4
.
Figure 3.4
Nonhierarchical, Serial Mode, QPSK Constellation
3.1.1.2 Parallel Output Format
In this mode, soft decisions are output in parallel, and the output
interface of the L64780 is configured. See
Figure 3.5
.
Figure 3.5
Output Interface in Nonhierarchical and Parallel Modes
The output interface passes two soft decisions to the Viterbi decoder in
parallel through SD0 and SD1, accompanied by a data valid indicator.
CLKOUT54
SD04
SD05
SD06
SD07
SD00
SD01
SD02
SD03
SD0[3:0]
DVOUT
CLKOUT54
SD00
SD01
SD02
SD03
SD0[3:0]
DVOUT
SD0
DVOUT
CLKOUT54
L64780
SD1
DVOUT_LP (not used
*
)
* When not used, the signal is deasserted LOW.
4
4
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