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GS1661 Datasheet(PDF) 36 Page - Semtech Corporation |
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GS1661 Datasheet(HTML) 36 Page - Semtech Corporation |
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36 / 84 page  GS1661 HD/SD SDI Receiver Data Sheet 53751 - 3 September 2012 36 of 84 Figure 4-5: Switch Line Locking on a Non-Standard Switch Line 4.9.2 Automatic Switch Line Lock Handling The synchronous switch point is defined for all major video standards in SMPTE RP168-2002. The device automatically re-synchronizes the word alignment block and timing signal generator at the switch point, based on the detected video standard. The device, as described in Section 4.9.1 and Figure 4-5 above, implements the re-synchronization process automatically, every field/frame. The switch line is defined as follows: • For 525 line interlaced systems: resynchronization takes place at then end of lines 10 & 273 • For 525 line progressive systems: resynchronization takes place at then end of line 10 • For 625 line interlaced systems: resynchronization takes place at then end of lines 6 & 319 • For 625 line progressive systems: resynchronization takes place at then end of line 6 • For 750 line progressive systems: resynchronization takes place at then end of line 7 • For 1125 line interlaced systems: resynchronization takes place at then end of lines 7 & 568 • For 1125 line progressive systems: resynchronization takes place at then end of line 7 NOTE: Unless indicated by SMPTE 352M payload identifier packets, the GS1661 does not distinguish between 1125-line progressive segmented-frame (PsF) video and 1125-line interlaced video operating at 25 or 30fps. However. PsF video operating at 24fps is detected by the device. A full list of all major video standards and switching lines is shown in Table 4-7. EAV ANC AC TIVE PICTU RE EAV ANC SAV EAV ANC ACTIVE PICTUR E SAV EAV ANC ACTIVE PICTURE SAV EAV ANC SAV Video source 1 EAV ANC AC TIVE PICTU RE EAV ANC SAV EAV ANC ACTIVE PICTUR E SAV EAV ANC SAV ACTIVE PICTURE EAV ANC SAV Video source 2 EAV ANC AC TIVE PICTU RE SAV EAV ANC SAV DATA IN ACTIVE PICTURE EAV ANC SAV ANC ACTIVE PICTURE EAV ANC SAV Switch point TRS position EAV ANC AC TIVE PICTU RE SAV EAV ANC SAV ANC ACTIVE PICTURE DATA OUT ACTIVE PICTURE EAV ANC SAV EAV ANC SAV SW _EN sw itch video source 1 to 2 EAV ANC AC TIVE PICTU RE EAV ANC SAV EAV ANC ACTIVE PICTUR E SAV EAV ANC ACTIVE PICTURE SAV EAV ANC SAV Video source 1 EAV ANC AC TIVE PICTU RE EAV ANC SAV EAV ANC ACTIVE PICTUR E SAV EAV ANC SAV ACTIVE PICTURE EAV ANC SAV Video source 2 EAV ANC AC TIVE PICTU RE SAV EAV ANC SAV DATA IN ACTIVE PICTURE EAV ANC SAV ACTIVE PICTURE EAV ANC SAV Switch point EAV ANC AC TIVE PICTU RE SAV EAV ANC SAV ACTIVE PICTURE DATA OUT sw itch video source 2 to 1 EAV ANC SAV ACTIVE PICTURE EAV ANC SAV Re-synchronization SW _EN Re-synchronization TRS position |
Similar Part No. - GS1661 |
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Similar Description - GS1661 |
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