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(diào)器)
中文描述: 的DVB - T COFDM解調(diào)器(對地數(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): 38/126頁
文件大?。?/td> 953K
代理商: L64780
3-2
Interfaces
3.1.1.1 Serial Output Format
In serial output mode, the output port of the L64780 is configured as
shown in
Figure 3.1
.
Figure 3.1
Output Interface in Nonhierarchical and Serial Modes
The output interface passes 4-bit or 3-bit soft decisions to the Viterbi
decoder through the SD0 signal accompanied by the assertion of
DVOUT. All outputs from the output interface are clocked at 54 MHz by
CLKOUT54.
With a 64 QAM constellation, the L64780 extracts six soft decisions from
every constellation point at 9 MHz; for example, one soft decision is
presented every 54 MHz clock cycle. See
Figure 3.2
.
Figure 3.2
Nonhierarchical, Serial Mode, 64 QAM Constellation
Every time a set of soft decisions is received from the bit deinterleaver,
the DVOUT signal stays asserted for six 54 MHz clock cycles. The
DVOUT signal is deasserted only during the scattered pilots, unused
carriers, or guard interval.
4
SD0
DVOUT
CLKOUT54
L64780
4
SD1 (not used
*
)
DVOUT_LP (not used
*
)
* When not used, the signal is deasserted LOW.
CLKOUT54
SD0[3:0]
DVOUT
SD010
SD08
SD09
SD07
SD06
SD05
SD03
SD04
SD02
SD00 SD01
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