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參數(shù)資料
| 型號： | L64767 |
| 廠商： | LSI CORP |
| 元件分類： | 消費家電 |
| 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 |
| 文件頁數(shù)： | 6/32頁 |
| 文件大?。?/td> | 298K |
| 代理商： | L64767 |
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L64767 SMATV QAM Encoder
Specify a unique sync byte to be inserted in the input stream in a
specified sync length distance
Synchronizing the L64767 with an input pulse will set byte and block
boundaries with the pulse. The sync byte you define can be reinserted
at the location of the pulse.
Circular FIFO Buffer
A dual-ported RAM implements the circular FIFO buffer in the L64767.
The circular buffer has a write pointer driven by ICLK, and a read pointer
driven by OCLK/4 (or OCLK/2 in 2-fold oversampling mode). Since there
are no built-in mechanisms to prevent collisions of these pointers, you
must configure the follow-up time and proper initial setup of the pointer
distance through the phase-locked loop (PLL) module of the L64767. The
circular FIFO buffer is illustrated in
Figure 3
.
You can ensure that the read pointer is directly opposite to the write
pointer most of the time by properly programming delay values. This
approach reduces the effect of PLL frequency swings that can occur
during phases of an unstable input signal. You can also select smaller
distances to reduce system delay.
Figure 3. Circular Read/Write FIFO Buffer
To initialize the circular FIFO buffer, download 0 to 127 cycles into the
read address pointer to specify the distance between the read and write
pointers. To do this, you can specify the FIFO delay value. When
specifying this value, you must use Gray code numbers with even parity
(an even number of 1s). Both the read and write pointers are Gray code
counter-driven. The write pointer is initialized to zero when the read
counter is loaded.
Circular
Buffer
128 Words
Zero
Read Pointer
Write Pointer
MD97.16
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