參數(shù)資料
型號(hào)： L64767
廠商： LSI CORP
元件分類： 消費(fèi)家電
英文描述： SMATV（Satellite Master Antenna Television） QAM Encoder(衛(wèi)星主天線電視正交振幅調(diào)制編碼器)
中文描述： SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝： MQUAD-100
文件頁(yè)數(shù)： 13/32頁(yè)
文件大小： 298K
代理商： L64767
L64767 SMATV QAM Encoder
13
Output Signals
This section describes the output signals from the L64767 to another
device such as an analog QAM modulator.
FIFOALARM
FIFO Collision Detected
This alarm signal indicates the FIFO control has detected
equal pointers for read and write access. The collision is
probably caused by an unlocked external PLL-VCO
circuitry. The signal is synchronized with SCLK-driven
flip-flops for the output.
Output
FIRSTOUT
First Block of a New Sequence Out
This signal occurs together with FSTARTOUT and
indicates the head of a sync block, which has just reset
all internal sequences, as controlled by SSTARTIN.
FIRSTOUT is the acceptance of an SSTARTIN falling
edge delayed by all internal processing modules.
Output
FSTARTOUT
Frame Start
FSTARTOUT is driven HIGH during the first symbol in
every sync frame. The width of FSTARTOUT reflects the
number of bytes inserted by the gap parameter. A
one-cycle width indicates no additionally inserted gaps.
A width of 17 means 16 RS check bytes have been
inserted. FSTARTOUT is applied only in synchronization
word detection mode. If synchronization is forced by
FSTARTIN pulses, FSTARTOUT is constantly LOW.
Output
SCLK
Symbol Clock
SCLK is a clock output signal that is synchronous to
symbols and bytes processed internally.
Output
SMAENC_I[9:0]
Symbol I Modulation
These signals provide 10-bit digital values at the digital
filter output for D/A conversion and for analog modulation.
Output
SMAENC_Q[9:0]
Symbol Q Modulation
These signals provide 10-bit digital values at the digital
filter output for D/A conversion and for analog modulation.
Output
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