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參數(shù)資料
| 型號： | AL128 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:55; Series:MS27497; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:22; Circular Contact Gender:Socket; Circular Shell Style:Wall Mount Receptacle RoHS Compliant: No |
| 中文描述： | 即插即用VGA到的NTSC / PAL制式轉換器 |
| 文件頁數(shù)： | 22/45頁 |
| 文件大?。?/td> | 498K |
| 代理商： | AL128 |
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AL128
April 2, 1999
22
The read clock RCLK is either 14.318MHz for NTSC or 17.734MHz for PAL. Not every single
pixel of input data is read so that the bandwidth may fit the lower TV resolution, and this is
controlled by various enable duty cycles of the REN. PAL has a higher enable duty cycle than NTSC
because of its higher resolution. MRRST is applied right before the next valid output field to reset
the read pointer back to zero.
The following drawing shows the TV sync signals and FIFO control read timing:
RCK
REN
Front porch
Back porch
REN
TVHSYNC
AL128-27 FIFO control TV timing
MRRST
SYNC
Back porch
Front porch
Active lines
TVVSYNC
TVHSYNC
TVVSYNC
MRRST
CVBS
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