參數(shù)資料
型號: GS9092
廠商: Gennum Corporation
英文描述: GS9092 GenLINX-R III 270Mb/s Serializer for SDI and DVB-ASI
中文描述: GS9092 GenLINX - R的第三270Mb / s的串行SDI和DVB - ASI在內
文件頁數(shù): 34/58頁
文件大?。?/td> 608K
代理商: GS9092
GS9092 Data Sheet
28202 - 2
September 2005
34 of 58
3.6 Data-Through Mode
The GS9092 may be configured by the application layer to operate as a simple
parallel-to-serial converter. In this mode, the device presents data to the output
buffer without performing any scrambling, encoding, or word-alignment.
Data-through mode is enabled only when both the SMPTE_BYPASS and
DVB_ASI pins are set low by the application layer.
3.7 Additional Processing Functions
The GS9092 contains an additional data processing block which is available in
SMPTE mode only (see
SMPTE Mode on page 32
).
3.7.1 Input Data Blank
The GS9092 can crop the video input data, where the cropped region is set to
blanking levels. All input video and ancillary data will be set to blanking levels by
the device, however, the TRS will be protected at all times.
When the BLANK pin is set LOW, the input video will be set to blanking levels until
the BLANK pin is re-asserted HIGH. When set HIGH, the input video will not be
blanked. This allows portions of the input video to be dynamically cropped, based
on the timing of the BLANK input.
The BLANK input should be synchronized to the PCLK unless the internal FIFO is
enabled and configured for video mode. If the FIFO is in video mode, the BLANK
input should not be used.
3.7.2 Automatic Video Standard Detection
The GS9092 can detect the input video standard by using the timing parameters
extracted from the received TRS ID words or supplied H, V, and F timing signals.
Total samples per line, active samples per line, total lines per field/frame and active
lines per field/frame are calculated and presented to the host interface via the four
RASTER_STRUCTURE registers (
Table 3-3
).
In addition to the RASTER_STRUCTURE registers, bit 4 of the
VIDEO_STANDARD register contains a status bit, STD_LOCK, which will be set
HIGH whenever the device has achieved full synchronization to the detected video
standard.
The STD_LOCK bit, as well as the RASTER_STRUCTURE registers will default to
zero under any of the following conditions:
NOTE: When the video data is removed, but the PCLK remains, the
VIDEO_STANDARD register will contain the last detected standard. To clear the
registers, the PCLK must be removed as well or the device must be reset.
RESET is LOW
SMPTE_BYPASS is LOW
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