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GS9092A Datasheet(PDF) 42 Page - Gennum Corporation |
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GS9092A Datasheet(HTML) 42 Page - Gennum Corporation |
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42 / 63 page  GS9092A GenLINX® III 270Mb/s Serializer for SDI and DVB-ASI Data Sheet 34715 - 4 May 2010 42 of 63 DC), reserved code words and checksum. Calculation of both full field (FF) and active picture (AP) CRC's will be carried out by the device. By default, after a system reset, the GS9092A will calculate the EDH ranges based on the setting of the DETECT_TRS pin. If DETECT_TRS is LOW, the device will calculate the EDH ranges based on the received H, V, and F timing. If DETECT_TRS is HIGH, the device will calculate the ranges based on the internal TRS timing. Alternatively, the user can program the EDH calculation ranges in the host interface. The registers available to the host interface for programming EDH calculation ranges include active picture and full field line start and end positions for both fields. Table 3-7 shows the relevant registers, which default to '0' after device reset. If any or all of these register values are zero, then the EDH CRC calculation ranges will be determined from the flywheel generated H signal. The first AP pixel will always be the first pixel after the SAV TRS code words. The first FF pixel will always be the first pixel after the EAV TRS code words. The last AP pixel and last FF pixel will always be the last pixel before the start of the EAV code words. Figure 3-9 shows the positions of the FF and AP pixel positions relative to TRS words and H timing. Figure 3-9: First and Last FF and AP Pixel Positions H Timing (H_CONFIG = LOW) 3FF 3FF 000 000 000 000 XYZ SAV XYZ EAV LAST FF & AP PIXEL FIRST AP PIXEL FIRST FF PIXEL FIRST AP PIXEL FIRST FF PIXEL LAST FF & AP PIXEL H Timing (H_CONFIG = HIGH) |
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