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GS9090B Datasheet(PDF) 27 Page - Gennum Corporation |
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GS9090B Datasheet(HTML) 27 Page - Gennum Corporation |
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27 / 71 page  GS9090B Data Sheet 40749 - 2 January 2007 27 of 71 3.6 SMPTE Functionality The GS9090B is in SMPTE mode once the device has detected two SMPTE TRS sync words. The GS9090B will remain in SMPTE mode until six SMPTE TRS sync words fail to be detected. TRS word detection is a continuous process, and the device will identify both 8-bit and 10-bit TRS words. In Auto mode, the GS9090B sets the SMPTE_BYPASS pin HIGH and the DVB_ASI pin LOW to indicate that it has locked to a SMPTE input data stream. When operating in Manual mode, the DVB_ASI pin must be set LOW and the SMPTE_BYPASS pin must be set HIGH in order to enable SMPTE operation. 3.6.1 SMPTE Descrambling and Word Alignment The GS9090B performs NRZI-to-NRZ decoding, descrambling according to SMPTE 259M-C, and word alignment of the data to the TRS sync words when in SMPTE mode. NOTE: When 8-bit data is embedded into the SMPTE signal, the source must have the two LSBs of the 10-bit stream set to logic LOW in order for word alignment to function correctly. 3.6.2 Internal Flywheel The GS9090B has an internal flywheel for the generation of internal / external timing signals, the detection and correction of certain error conditions, and the automatic detection of video standards. The flywheel is only operational in SMPTE mode. The flywheel 'learns' the video standard by timing the horizontal and vertical reference information contained in the TRS ID words of the received video stream. The flywheel maintains information about the total line length, active line length, total number of lines per field / frame, and total active lines per field / frame for the received video stream. Full synchronization of the flywheel to the received video standard therefore requires one complete video frame. Once synchronization has been achieved, the flywheel will continue to monitor the received TRS timing information to maintain synchronization. The FW_EN input pin controls the synchronization mechanism of the flywheel. When this input signal is LOW, the flywheel will re-synchronize all pixel and line based counters on every received TRS ID word. When FW_EN is set to logic HIGH, re-synchronization occurs when the flywheel detects three to four consecutive video lines containing mistimed TRS information. This provides a measure of noise immunity to internal and external timing signal generation. The flywheel will be disabled if the device loses lock, or a LOW-to-HIGH transition occurs on the RESET pin. |
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